Nac: Chapter 535 - Dams And Other Obstructions

Link to law: http://www.leg.state.nv.us/nac/NAC-535.html
Published: 2015

[Rev. 1/2/2015 3:27:58 PM]

 

This chapter of NAC has changes

which have been adopted but have not been codified; you can see those changes

by viewing the following regulation(s) on the Nevada Register of Administrative

Regulations: R054-14

[NAC-535 Revised Date: 4-12]

CHAPTER 535 - DAMS AND OTHER OBSTRUCTIONS

GENERAL PROVISIONS

535.010            Definitions.

535.015            “Alters” or “alteration” defined.

535.020            “Applicant” defined.

535.025            “Application for approval of plans

for a dam” defined.

535.030            “Capacity” defined.

535.035            “Closure” defined.

535.040            “Dam” defined.

535.045            “Decommission” defined.

535.050            “Impounding” defined.

535.055            “Inflow design flood” defined.

535.060            “Maximum conservation elevation”

defined.

535.065            “Maximum credible earthquake”

defined.

535.070            “Operator” defined.

535.075            “Owner” defined.

535.080            “Probable maximum flood” defined.

535.085            “Professional engineer” defined.

535.090            “State Engineer” defined.

535.095            “Water” defined.

535.100            “Water right” defined.

535.110            Expression of “elevation.”

535.120            Height, crest and toe of dam.

535.130            Determination of size of dam.

535.140            Hazard classifications.

CONSTRUCTION, RECONSTRUCTION, ALTERATION AND DECOMMISSIONING

OF DAMS

535.200            Notice to State Engineer before

construction, reconstruction or alteration of dam.

535.210            Submission of application for

approval of plans for dam.

535.220            Submission of application for

approval of plans for decommissioning of dam.

535.230            Rejection of application;

resubmission; conditional approval.

535.240            Requirements for approval.

535.250            Requirements for approval

concerning earthquakes.

535.260            Design and construction oversight

by professional engineer; construction by licensed contractors.

535.270            Compliance with terms and

conditions of approval; violations.

535.280            Abandonment of dam.

535.290            Closure of file associated with

decommissioned dam.

535.300            Request for approval to impound.

535.310            Request for temporary approval to

impound.

535.320            Emergency action plan.

535.330            Grounds for revocation of approval

to impound.

535.340            Restrictions on impoundment of

water.

535.350            Assessment of fee for approved

storage.

535.360            Inspections; completion of required

repairs.

535.370            Operation and maintenance.

535.380            Transfer of approval to impound.

535.390            Violations.

535.400            Variances.

535.410            Exemptions.

535.420            Effective date of documents.

 

GENERAL PROVISIONS

      NAC 535.010  Definitions. (NRS 532.120)  As used

in this chapter, unless the context otherwise requires, the words and terms

defined in NAC 535.015 to 535.100,

inclusive, have the meanings ascribed to them in those sections.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.015  “Alters” or “alteration” defined. (NRS 532.120)  “Alters”

or “alteration” includes breaching, decommissioning, modifying, raising and

removing.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.020  “Applicant” defined. (NRS 532.120)  “Applicant”

means a person who files an application for approval of plans for a dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.025  “Application for approval of plans for a dam” defined. (NRS 532.120)  “Application

for approval of plans for a dam” means an application submitted pursuant to

paragraph (b) of subsection 2 of NRS

535.010 for approval of plans and specifications for a new dam or for the

reconstruction or alteration of an existing dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.030  “Capacity” defined. (NRS 532.120)  “Capacity”

means the maximum volume of water, expressed in acre-feet, that a dam is

physically capable of impounding without overtopping.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.035  “Closure” defined. (NRS 532.120)  “Closure”

means the permanent revocation by the State Engineer of permission to construct,

maintain or operate a dam or to impound water behind a dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.040  “Dam” defined. (NRS 532.120)  “Dam”

means any structure that stores or diverts water for a beneficial purpose. The

term includes a dam that is proposed. The term does not include a levee or road

embankment that is:

     1.  Designed as a levee or floodwall intended

to constrain the water of a creek or river to its natural floodplain in the

event of a flood;

     2.  Designed as a levee for the reinforcement

of a ditch, watercourse or canal; or

     3.  Designed for the sole purpose of

supporting a roadbed, path or other means of conveyance for the transportation

of vehicles, pedestrians, trains or bulk commodities if the levee or

embankment:

     (a) Is free-draining;

     (b) Has a residence time for impounded storm water

of less than 24 hours; and

     (c) Unless the levee or embankment is less than 10

feet in height, has drainage capacity sufficient to pass, without overtopping,

an amount of water equal to the storm runoff generated by a storm whose annual

chance of exceedence is 1 percent.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.045  “Decommission” defined. (NRS 532.120)  “Decommission”

means to physically render a dam incapable of impounding any significant

quantity of water.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.050  “Impounding” defined. (NRS 532.120)  “Impounding”

includes any detention of water without regard to the duration of the

detention.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.055  “Inflow design flood” defined. (NRS 532.120)  “Inflow

design flood” means a hypothetical flood of a given magnitude that is used to

determine the design of a dam and its related hydraulic features.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.060  “Maximum conservation elevation” defined. (NRS 532.120)  “Maximum

conservation elevation” means that elevation to which water is approved to be

stored pursuant to the approval to impound.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.065  “Maximum credible earthquake” defined. (NRS 532.120)  “Maximum

credible earthquake” means a hypothetical earthquake of a magnitude determined

by the United States Geological Survey as the worst-case scenario that is

reasonably possible for the region in which a dam is located.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.070  “Operator” defined. (NRS 532.120)  “Operator”

means a person, including an owner or his or her designee, who controls the

day-to-day operations of a dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.075  “Owner” defined. (NRS 532.120)  “Owner”

means a person, including a governmental agency or quasi-governmental agency,

that:

     1.  Causes a dam to be built, rebuilt or

modified;

     2.  Owns or controls real property on which a

dam is constructed;

     3.  Owns or controls real property inundated

by the reservoir created by a dam;

     4.  Owns a water right that is impounded or

diverted by a dam;

     5.  Is a successor in interest in a chain of

title that expressly mentions a dam;

     6.  Is a local cooperator who will assume any

control over a project constructed by the United States Army Corps of Engineers

or the United States Bureau of Reclamation; or

     7.  Is identified by the State Engineer as a

person responsible for a dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.080  “Probable maximum flood” defined. (NRS 532.120)  “Probable

maximum flood” means a hypothetical flood whose magnitude is:

     1.  The largest that could be expected from

the most severe combination of critical meteorologic and hydrologic conditions

that are reasonably possible for the region in which a dam is located; and

     2.  Such that there is virtually no chance of

its being exceeded.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.085  “Professional engineer” defined. (NRS 532.120)  “Professional

engineer” has the meaning ascribed to it in NRS 625.060.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.090  “State Engineer” defined. (NRS 532.120)  “State

Engineer” has the meaning ascribed to it in NRS 533.015.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.095  “Water” defined. (NRS 532.120)  “Water”

includes any potentially mobile fluid or semifluid substance that is capable of

being impounded by a dam, including, without limitation, tailings, slimes,

organic waste and sewage.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.100  “Water right” defined. (NRS 532.120)  “Water

right” means a valid appropriation of the public waters of this state pursuant

to chapters 533 and 534 of NRS.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.110  Expression of “elevation.” (NRS 532.120)  For the

purposes of this chapter, each “elevation” must be expressed as a deviation

from a point included in the North American Vertical Datum of 1988.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.120  Height, crest and toe of dam. (NRS 532.120)  For the

purposes of this chapter:

     1.  The height of a dam is the maximum

difference in elevation between the crest and the toe of the dam.

     2.  The crest of a dam is the nominal top

horizontal surface of the dam excluding railings or parapet walls.

     3.  The toe of a dam is the contact between

the outer shell of the dam and the natural ground surface on the downstream

side of the dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.130  Determination of size of dam. (NRS 532.120)  For the

purposes of this chapter, a dam is:

     1.  Small if it is less than 20 feet in

height and impounds less than 100 acre-feet of water.

     2.  Medium if it is neither small nor large.

     3.  Large if it is 50 feet or more in height

or impounds 10,000 acre-feet or more of water.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.140  Hazard classifications. (NRS 532.120, 535.040)

     1.  The State Engineer will assign a hazard

classification to each dam.

     2.  The State Engineer will determine the

immediate consequences to persons and property located downstream from the dam

in the event of a failure of the dam. The State Engineer will classify a dam

as:

     (a) High hazard if its failure carries a high

probability of causing a loss of human life.

     (b) Significant hazard if its failure carries a:

          (1) Reasonable probability of causing a loss

of human life; or

          (2) High probability of causing extensive

economic loss or disruption in a lifeline.

     (c) Low hazard if its failure carries a:

          (1) Very low probability of causing a loss of

human life; and

          (2) Reasonable probability of causing little,

if any, economic loss or disruption in a lifeline.

     3.  If changes in the persons or property

located downstream from a dam change the immediate consequences in the event of

a failure of the dam, the State Engineer will change the hazard classification

of the dam accordingly.

     4.  The hazard classification of a dam does

not constitute a warranty in favor of anyone concerning the actual safety of

the dam.

     5.  As used in this section, “lifeline” includes,

without limitation, a:

     (a) Road that is the sole means of access to a

community;

     (b) Major trunk or transmission line for gas or

electricity, the disruption of which could pose significant risks to the public

health, safety or welfare of the affected community;

     (c) Transmission line for gas or electricity that

serves a hospital or other comparable facility; and

     (d) Railroad line used or proposed to be used in

interstate commerce.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

CONSTRUCTION, RECONSTRUCTION, ALTERATION AND

DECOMMISSIONING OF DAMS

      NAC 535.200  Notice to State Engineer before construction, reconstruction or

alteration of dam. (NRS 532.120, 535.010)

     1.  A person who is required, pursuant to NRS 535.010, to notify the State

Engineer before he or she constructs, reconstructs or alters a dam must submit

to the State Engineer:

     (a) A description of all work that is proposed.

     (b) The name, mailing address and telephone number

of each owner of the dam.

     (c) The name, mailing address and telephone number

of the operator of the dam.

     (d) The name, mailing address and telephone number

of each professional engineer in responsible charge of work in connection with

the proposed work on the dam.

     (e) The source of the water to be impounded by the

dam.

     (f) The number of the permit for each water right

for the water to be impounded by the dam.

     (g) The date on which the work on the dam is

anticipated to commence.

     (h) The location of the dam. The location must be

expressed by bearing and distance to a known section corner from a reference

point on the dam. The reference point must be on the long axis of the dam at

the station where the toe is at the lowest elevation. If no single point meets

this criterion, the reference point must be at the intersection of the long

axis and the principle outlet centerline of the dam.

     (i) An estimate of the length, height and volume of

the dam.

     (j) The capacity of the reservoir to be created by

the dam.

     (k) A set of plans for the proposed work. The set

of plans must:

          (1) Consist of at least three sheets of paper

that are each 11 by 17 inches in size and contain:

               (I) A cover sheet that includes the names

of all the owners, the name of the dam or project and a location plat for the

dam that includes a referenced section corner;

               (II) A plan view of the dam and

impoundment that shows the alignments of cross sections of the dam; and

               (III) One or more cross sections of the

dam that depict the outlet, spillway and maximum embankment height.

          (2) Be prepared by a person licensed pursuant

to the provisions of chapter 623, 624 or 625 of NRS, or by an owner or builder of

the dam.

     2.  The State Engineer will review the notice

and its accompanying materials and, not later than 30 days after receiving the

notice, will respond in writing stating:

     (a) The deficiencies, if any, in the submission

that must be cured;

     (b) That approval of the plans and specifications

pursuant to subsection 2 of NRS

535.010 is required before construction may begin; or

     (c) That no such approval is necessary.

     3.  A person who files a completed

application for approval of plans for a dam pursuant to NAC

535.210 or 535.220 shall be deemed to have

complied with this section.

     4.  As used in this section, “responsible

charge of work” has the meaning ascribed to it in NRS 625.080.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.210  Submission of application for approval of plans for dam. (NRS 532.120, 533.435, 535.010)

     1.  Except as otherwise provided in NAC 535.220, a person who is required by NRS 535.010 to file an application

for approval of plans for a dam must submit to the State Engineer:

     (a) The application;

     (b) The fee for examining and acting upon such

plans and specifications required by NRS

533.435; and

     (c) Three copies of the plans and specifications,

including, without limitation:

          (1) A design report;

          (2) A geotechnical report;

          (3) The specifications for construction;

          (4) A set of plans; and

          (5) If required or permitted by the State

Engineer, one or more addenda.

Ê Each element

of the plans and specifications must be prepared by or under the supervision of

a professional engineer and must bear the wet stamp and signature of the

professional engineer.

     2.  The application must be:

     (a) On a form provided by the State Engineer;

     (b) Complete;

     (c) Signed by each owner of the dam or by an agent

authorized to sign the application on behalf of the owner; and

     (d) Bound separately from the plans and

specifications.

     3.  The design report must include, without

limitation:

     (a) A description of the proposed structure;

     (b) Discussions of:

          (1) The design approach;

          (2) The downstream hazard in the event of a

failure of the dam or a large release of water;

          (3) Any special conditions at the site of

which the applicant is aware;

          (4) Selection of the inflow design flood; and

          (5) Selection of the design earthquake; and

     (c) Calculations that establish:

          (1) The dam’s freeboard;

          (2) The dam’s inflow design flood;

          (3) The dam’s outlet capacity;

          (4) The dam’s spillway capacity;

          (5) The dam’s storm surcharge; and

          (6) If the dam is:

               (I) Concrete, the dam’s stability under

critical reservoir and seismic loading conditions for sliding, overturning,

cracking and abutment failure; or

               (II) An earthen embankment, the dam’s

slope stability under static, seismic, rapid fill and rapid draw down

conditions.

     4.  The geotechnical report must:

     (a) Include, or if filed with the plans refer to,

one or more plats showing each test pit, borehole or other exploration site;

     (b) Show the lithology at each exploration site,

including standard penetration test results or other means of estimating

bearing capacity;

     (c) Include estimates of the:

          (1) Suitability of the site for the proposed

project;

          (2) Foundation bearing capacity of the site;

and

          (3) Expected settlement;

     (d) Indicate the soil properties in each relevant

area, including, without limitation:

          (1) The foundation;

          (2) Each abutment;

          (3) The reservoir; and

          (4) The borrow;

     (e) Show the depth to groundwater and permeability

of foundation materials;

     (f) Explore seismic hazards in the area; and

     (g) Include a discussion of any special conditions

at the site of which the applicant is aware.

     5.  The specifications for construction must:

     (a) Address all aspects of construction;

     (b) Include a schedule of testing for quality

assurance and quality control;

     (c) Provide a precise citation to the location of

any other common specification to which it refers; and

     (d) Be on standard paper that is 8 1/2 by 11 inches

in size.

     6.  The plans must:

     (a) Depict the proposed work adequately and

include, without limitation:

          (1) A cover sheet that includes, without

limitation:

               (I) The name of each owner of the dam;

               (II) The name of the dam; and

               (III) A location plat that shows at least

one section corner;

          (2) A second sheet that shows

elevation-capacity and elevation-area curves;

          (3) A third sheet which includes a plan view

of the dam and impoundment that shows, without limitation:

               (I) The alignments of cross sections of

the dam;

               (II) The reference point of the dam, tied

to a found section corner and identified by latitude and longitude; and

               (III) Section corners and

postconstruction elevation contours;

          (4) A fourth sheet which includes cross sections

at each outlet and spillway, and at the maximum embankment height, that show

preconstruction and postconstruction ground elevation contours; and

          (5) A fifth sheet that shows appurtenant works

and details.

     (b) Show a tie with bearing and distance to a found

section corner from a reference point on the dam. The reference point must be

on the long axis at the station where the toe is at the lowest elevation. If no

single point meets this criterion, the reference point must be at the

intersection of the long axis and the centerline of the principle outlet.

     (c) Not include any spurious or excessive detail,

including, without limitation, plantings, streets, buildings and pipelines,

unless their location directly affects construction, operation or maintenance

of the project.

     (d) Unless the use of exaggerated dimensions is

necessary for clarity, have the same vertical and horizontal scales.

     (e) Be in one color on standard paper that is 24 by

36 inches in size.

     7.  Each addendum must:

     (a) Be reasonably necessary; and

     (b) Be on standard paper that, if the addendum

consists of:

          (1) Text only, is 8 1/2 by 11 inches in size;

or

          (2) An illustration, is not larger than 11 by

17 inches in size.

     8.  A calculation included in the plans and

specifications that concerns strength or stability must incorporate a factor of

safety. The factor of safety:

     (a) If the calculation describes conditions of

steady-state seepage static load, must not be less than 1.4;

     (b) If the calculation describes conditions of

postconstruction static load, must not be less than 1.3;

     (c) If the calculation describes conditions of

rapid reservoir draw down load, must not be less than 1.25; or

     (d) If the calculation describes conditions of

seismic load, must not be less than 1.0.

     9.  For the purposes of determining whether a

person is required to apply for approval of plans for a dam pursuant to

paragraph (b) of subsection 2 of NRS

535.010, the State Engineer will calculate the capacity of the dam as the

volume of water, expressed in acre-feet, detained above the anticipated

elevation of the lowest point on the toe of the dam.

     10.  As used in this section, “design

earthquake” means a hypothetical earthquake of a specified magnitude used in

the design of a dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.220  Submission of application for approval of plans for

decommissioning of dam. (NRS 532.120, 535.010)

     1.  A person who is required by NRS 535.010 to file an application

for approval of plans for the decommissioning of a dam must submit to the State

Engineer:



     (a) The application; and

     (b) Three copies of the plans and specifications,

including, without limitation:

          (1) A design report;

          (2) The specifications for construction; and

          (3) A set of plans.

Ê Each element

of the plans and specifications must be prepared by or under the supervision of

a professional engineer and must bear the wet stamp and signature of the

professional engineer.

     2.  The application must be:

     (a) On a form provided by the State Engineer;

     (b) Complete; and

     (c) Signed by each owner of the dam or by an agent

authorized to sign the application on behalf of the owner.

     3.  The design report must include, without

limitation:

     (a) A detailed description of the proposed work;

     (b) Discussions of:

          (1) The plan for release of water impounded by

the dam;

          (2) The stabilization of sediment;

          (3) The anticipated consequences to persons

and property located downstream from the dam;

          (4) Design features to prevent a sudden

release of water or slope failure during decommissioning; and

          (5) Erosion control; and

     (c) If a breach in an embankment of the dam is

designed with a bottom width that is less than the height of the embankment,

calculations that establish the slope stability of the walls of the breach.

     4.  The specifications for construction must:

     (a) Address all aspects of construction;

     (b) Include a schedule of testing for quality assurance

and quality control;

     (c) Provide a precise citation to the location of

any other common specification to which it refers;

     (d) Be on standard paper that is 8 1/2 by 11 inches

in size; and

     (e) Set forth the sequence of activities, including

a timetable.

     5.  The plans must:

     (a) Depict the proposed work adequately and

include, without limitation:

          (1) A cover sheet that includes, without

limitation:

               (I) The name of each owner of the dam;

               (II) The name of the dam; and

               (III) A location plat that shows at least

one section corner;

          (2) A second sheet which includes a plan view

of the existing dam and impoundment that shows, without limitation:

               (I) The alignments of cross sections of

the dam showing proposed alterations to the dam and impoundment;

               (II) The reference point of the dam, tied

to a found section corner and identified by latitude and longitude; and

               (III) Section corners and elevation

contours; and

          (3) A third sheet which includes a plan view

of the dam and impoundment at the completion of decommissioning that shows,

without limitation:

               (I) Details of proposed alterations to

the dam and impoundment, including any new construction for the purposes of

erosion control; and

               (II) Representative cross sections

through the dam, breach and impoundment.

     (b) Show a tie with bearing and distance to a found

section corner from a reference point on the existing dam. The reference point

must be on the long axis at the station where the toe is at the lowest

elevation. If no single point meets this criterion, the reference point must be

at the intersection of the long axis and the centerline of the principle

outlet.

     (c) Unless the use of exaggerated dimensions is

necessary for clarity, have the same vertical and horizontal scales.

     6.  For the purposes of determining whether a

person is required to apply for approval of plans for the decommissioning of a

dam pursuant to paragraph (b) of subsection 2 of NRS 535.010, the State Engineer

will calculate the capacity of the dam as the volume of water, expressed in

acre-feet, detained above the anticipated elevation of the lowest point on the

toe of the dam.

     7.  As used in this section,

“decommissioning” includes breaching and removing.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.230  Rejection of application; resubmission; conditional approval. (NRS 532.120, 535.010)

     1.  The State Engineer will reject an

application that:

     (a) Appears to be incomplete; or

     (b) Lacks the correct fee.

Ê The rejected

application, any accompanying plans or specifications and the fee, if any, will

be returned to the applicant.

     2.  The State Engineer will:

     (a) Examine each unrejected application in the

order in which it is received; and

     (b) Approve or disapprove the application within 90

days after receipt.

     3.  If the State Engineer returns the plans

and specifications to the applicant for correction or revision pursuant to

subsection 3 of NRS 535.010, the

State Engineer will:

     (a) Identify the defects or other deficiencies;

     (b) Establish a reasonable time, not to exceed 60

days after the date of receipt, within which the applicant may revise or

correct and resubmit the plans; and

     (c) Retain the fee.

Ê There is no

additional fee for the resubmission of a revised or corrected application

within the time established by the State Engineer.

     4.  The State Engineer may condition his or

her approval of an application by imposing terms of approval on the work

proposed. If the State Engineer imposes such terms, he or she will provide a

copy of the terms to the Board of Wildlife Commissioners.

     5.  If the State Engineer approves, or

approves as conditioned, the plans and specifications for a dam, the State

Engineer will:

     (a) Endorse the application with the State

Engineer’s stamp and signature;

     (b) Retain a copy of the application for his or her

records;

     (c) Return a copy of the application to the

applicant; and

     (d) Deem the endorsed application a permit issued

by the State of Nevada for the purposes of NRS 535.050.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.240  Requirements for approval. (NRS 532.120, 535.010)

     1.  Except as otherwise provided in NAC 535.220, to obtain the approval of the State

Engineer pursuant to NRS 535.010,

the plans and specifications must, in addition to all other applicable

requirements, demonstrate to the satisfaction of the State Engineer that:

     (a) The dam and reservoir are able to accommodate

the inflow design flood for the tributary watershed without the failure of the

dam or any other unintended release of water.

     (b) The inflow design flood selected is appropriate

given the intended purpose, hazard classification and size of the dam.

     2.  For the purposes of this section, the

inflow design flood used for design purposes must not, except as otherwise

provided in subsection 3, be less than:

     (a) A probable maximum flood, if the dam:

          (1) Is classified as high hazard or is a large

dam and classified as significant hazard; or

          (2) Lacks one or more spillways.

     (b) The greater of one-half of the probable maximum

flood or a flood whose annual chance of exceedence is 0.2 percent, if the dam

is a small or medium dam and is classified as significant hazard.

     (c) A flood whose annual chance of exceedence is 1

percent, for all other dams.

     3.  The State Engineer will approve plans

that use an inflow design flood which is less than those set forth in subsection

2 if the applicant provides an incremental damage analysis that demonstrates,

to the satisfaction of the State Engineer, that a lesser event is appropriate.

     4.  An applicant may use one or more

watershed diversion structures in lieu of spillways for the protection of a dam

embankment so long as:

     (a) The impoundment created by the embankment so

protected is temporary; and

     (b) The diversion structures are designed to

accommodate the greater of the inflow design flood or five times the expected

life of the impoundment.

     5.  A dam must have freeboard adequate to

prevent overtopping by wave run-up and reservoir fetch above the storm

surcharge elevation. The adequacy of the freeboard must be demonstrated by

evidence satisfactory to the State Engineer in the form of:

     (a) A wave run-up and reservoir fetch calculation;

or

     (b) Proof that the freeboard is not less than 3

feet above the storm surcharge elevation.

     6.  As used in this section, “storm surcharge

elevation” means the elevation that the water surface would reach if the inflow

design flood of a dam were added to a reservoir that is at its maximum

conservation elevation.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.250  Requirements for approval concerning earthquakes. (NRS 532.120, 535.010)

     1.  Except as otherwise provided in NAC 535.220, to obtain the approval of the State

Engineer pursuant to NRS 535.010,

the plans and specifications must, in addition to all other applicable

requirements, demonstrate to the satisfaction of the State Engineer that the

dam is able to accommodate an earthquake or other extreme motion event without

the failure of the dam or any other unintended release of water.

     2.  Except as otherwise provided in

subsection 3, the applicant must calculate the seismic response to a maximum

credible earthquake of a dam and its foundation, including, without limitation:

     (a) Potential liquefaction;

     (b) Loss of material strength;

     (c) Settlement;

     (d) Ground displacement; and

     (e) Wave action due to landslide or seiche.

Ê Any numeric

analysis of the seismic response must be calculated for the normal maximum

loading condition with steady-state seepage. If a pseudo static stability

analysis is performed for an earthen embankment, the calculations must be

accompanied by a description of the assumptions used in deriving the seismic

coefficient used in the calculations.

     3.  Subsection 2 does not apply to a dam

classified as low hazard or to a small earth dam classified as significant

hazard, if the applicant demonstrates to the satisfaction of the State Engineer

that the:

     (a) Static slope stability factor of safety is 1.5

or greater under normal maximum loading with steady-state seepage;

     (b) Peak site acceleration is not greater than 6.5

feet per second squared;

     (c) Materials used in the foundation and embankment

are not prone to liquefaction; and

     (d) Slope of the embankment is:

          (1) If the embankment is earthen, not greater

than 18.43 degrees from horizontal; or

          (2) If the embankment is free-draining

rockfill, not greater than 26.56 degrees from horizontal.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.260  Design and construction oversight by professional engineer;

construction by licensed contractors. (NRS 532.120, 535.010)

     1.  A professional engineer shall provide

design and construction oversight for any work on a dam for which the plans and

specifications require the approval of the State Engineer pursuant to NRS 535.010.

     2.  A contractor licensed pursuant to chapter 624 of NRS shall perform all

construction on a dam classified as high hazard or significant hazard and on a

large or medium dam classified as low hazard.

     3.  A small dam classified as low hazard may

be designed by empirical methods.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.270  Compliance with terms and conditions of approval; violations. (NRS 532.120, 535.030, 535.050)

     1.  An applicant who begins construction of a

dam pursuant to an application approved by the State Engineer shall:

     (a) Comply with all terms and conditions imposed by

the State Engineer as conditions for approval; and

     (b) Ensure that all construction conforms to the

plans as approved.

     2.  A dam built in violation of this section

is not legally established or recognized for the purposes of NRS 535.050, and the State Engineer

may order the removal of such a dam pursuant to that section. In addition, if

the dam presents an immediate danger, the State Engineer may take the remedial

steps authorized in NRS 535.030.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.280  Abandonment of dam. (NRS 532.120)

     1.  An owner shall not abandon a dam unless,

not later than 30 days before doing so, the owner notifies the State Engineer.

     2.  The notice must include:

     (a) The name, mailing address and telephone number

of each owner of the dam.

     (b) The number of the permit for each water right

for the water formerly impounded by the dam.

     (c) The location of the dam. The location must be

expressed by bearing and distance to a known section corner from a reference

point on the dam. The reference point must be on the long axis of the dam at the

station where the toe is at the lowest elevation. If no single point meets this

criterion, the reference point must be at the intersection of the long axis and

the principle outlet centerline of the dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.290  Closure of file associated with decommissioned dam. (NRS 532.120)

     1.  A person whose application for approval

of plans for the decommissioning of a dam has been approved by the State

Engineer may apply for the closure of the file associated with the dam.

     2.  The State Engineer will close a file if:

     (a) The dam has been breached intentionally or

through mishap;

     (b) The dam and impoundment have been

decommissioned;

     (c) The dam was not built;

     (d) All water rights associated with the dam have

been moved, cancelled, denied, withdrawn or forfeited; or

     (e) The applicant withdraws the application for

approval of plans for a dam.

     3.  If the State Engineer closes the file,

the dam may not be returned to service and no water may be impounded behind the

dam represented by that file until an owner complies with all applicable

sections of this chapter and chapter 535

of NRS.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.300  Request for approval to impound.

(NRS 532.120, 533.435, 535.030)

     1.  Except as otherwise provided in

subsection 8, an owner of a dam approved by the State Engineer pursuant to this

chapter shall not put the dam into operation, or otherwise impound any water,

until the owner obtains an approval to impound, including a temporary approval

to impound, from the State Engineer.

     2.  To obtain an approval to impound, an

owner or operator must submit to the State Engineer:

     (a) The name, mailing address and telephone number

of the operator of the dam;

     (b) Proof of completion of work, including, without

limitation:

          (1) A completed cover sheet on a form supplied

by the State Engineer;

          (2) The certification of a professional

engineer that the construction was in substantial compliance with the plans and

specifications as approved;

          (3) Documentation, satisfactory to the State

Engineer, of quality assurance and quality control in the construction of the

dam;

          (4) A set of plans for the dam as-built; and

          (5) Any other documents required by the terms

of the approval; and

     (c) The fee for filing proof of completion of work

required by NRS 533.435.

     3.  An owner or operator may request an

approval to impound a volume of water that is less than that granted to the

applicant as specified in the approval of the application for approval of plans

for a dam by submitting proof of completion of work for the work actually

performed.

     4.  The State Engineer will request, in

writing, any missing or additional information or correction of deficiencies

not later than 30 days after receiving a request for approval to impound.

     5.  The State Engineer will grant, in

writing, an approval to impound upon:

     (a) Successful completion of terms pertaining to

construction;

     (b) Submittal of a complete proof of completion of

work form; and

     (c) Receipt of all requested additional

information, if any.

     6.  The approval to impound will set forth,

without limitation:

     (a) The approved capacity of the reservoir to the

maximum conservation elevation;

     (b) The approved height of the dam;

     (c) The minimum amount of freeboard that is

required to be maintained; and

     (d) Any other conditions or restrictions on operation

imposed by the State Engineer.

     7.  If the State Engineer orders a dam or

embankment to be breached or maintained in a drained condition pursuant to NRS 535.030:

     (a) The current approval to impound water shall be

deemed revoked; and

     (b) No water may be impounded behind the structure

until:

          (1) All conditions of the order have been

satisfied; and

          (2) The owner has obtained a new approval to

impound pursuant to this chapter.

     8.  A dam in existence before March 15, 1951,

shall be deemed to have approval to impound that volume of water for which

water rights had been established pursuant to chapters 533 and 534 of NRS by that date.

     9.  As used in this section:

     (a) “As-built” means record drawings prepared from

surveys made during construction and upon completion of the structure.

     (b) If the dam is a storm water detention dam that

is designed to be and is operated in a normally drained state, “maximum

conservation elevation” means the upstream invert elevation of the low-level

outlet.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.310  Request for temporary approval to impound. (NRS 532.120, 533.435)

     1.  The State Engineer may grant a temporary

approval to impound.

     2.  An applicant may request a temporary

approval to impound by submitting to the State Engineer:

     (a) The reason for the necessity of a temporary

approval to impound;

     (b) A timetable for submitting the deficient or

missing information or documents;

     (c) A completed proof of completion of work cover

sheet;

     (d) The certification of a professional engineer

that the construction is in substantial compliance with the plans and

specifications as approved; and

     (e) The fee for filing proof of completion of work

required by NRS 533.435.

     3.  If the State Engineer grants a temporary

approval to impound, he or she will establish a specific expiration date not to

exceed 90 days after the date of the approval.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.320  Emergency action plan. (NRS 532.120)

     1.  To obtain an approval to impound,

including a temporary approval to impound, an owner or operator must submit to

the State Engineer an emergency action plan:

     (a) If the dam is classified as high hazard, on or

after May 30, 2003.

     (b) If the dam is classified as significant hazard,

on or after March 31, 2005.

     2.  An owner or operator who is not required

to submit an emergency action plan pursuant to subsection 1 shall submit to the

State Engineer an emergency action plan:

     (a) If the dam is classified as high hazard, not

later than March 31, 2005.

     (b) If the dam is classified as significant hazard,

not later than March 31, 2007.

     3.  An emergency action plan must:

     (a) Be prepared under the direction of a

professional engineer;

     (b) Conform to the format specified by the State

Engineer;

     (c) Include a detailed response for each

foreseeable emergency; and

     (d) Include one or more inundation maps.

     4.  An owner or operator subject to this

section shall:

     (a) Perform periodic exercises under the plan; and

     (b) Modify the plan as necessary to keep it current

and incorporate lessons learned from the exercises.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.330  Grounds for revocation of approval to impound. (NRS 532.120)  The

State Engineer may revoke an approval to impound, including a temporary

approval to impound, if:

     1.  The approval is based on a water right

that is moved, cancelled, denied, withdrawn or forfeited.

     2.  The terms of the approval to impound are

violated.

     3.  The dam is operated in an unsafe manner.

     4.  The dam is damaged to such an extent

that, in the opinion of the State Engineer, its failure is reasonably possible.

     5.  The file associated with the dam is

closed pursuant to NAC 535.290.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.340  Restrictions on impoundment of water. (NRS 532.120)

     1.  Notwithstanding any provision in NAC 535.300, 535.310 or 535.320 to the contrary, an owner or operator shall

not impound an amount of water that is greater than the amount for which he or

she possesses water rights that are legally established and recognized:

     (a) Through a valid claim of vested right;

     (b) By decree of a court of competent jurisdiction;

or

     (c) Pursuant to a permit issued by the State

Engineer.

     2.  If a water right for water impounded by a

dam is moved, cancelled, denied, withdrawn or declared forfeited, the owner

shall:

     (a) Reduce the amount of water impounded to the amount

of water rights remaining; or

     (b) If the owner retains no water rights,

decommission the dam.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.350  Assessment of fee for approved storage. (NRS 532.120, 533.435)

     1.  Except as otherwise provided in

subsection 4, the State Engineer will, not later than December 31 of each year,

assess each private, nonagricultural dam that is operated pursuant to an

approval to impound, including a temporary approval to impound, the fee for

approved storage required by NRS

533.435.

     2.  The State Engineer will use the approved

capacity stated in the approval to impound, including a temporary approval to

impound, in effect as of December 31 of the fiscal year of the assessment as

the approved storage capacity subject to the fee.

     3.  The fee is due and payable upon receipt.

     4.  This section does not apply to a storm

water detention dam so long as the dam:

     (a) Has an unregulated outlet; and

     (b) Is free-draining.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.360  Inspections; completion of required repairs. (NRS 532.120, 535.030)

     1.  The State Engineer will, pursuant to NRS 535.030, inspect or require an

owner to inspect:

     (a) A dam classified as high hazard not less than

once a year;

     (b) A dam classified as significant hazard not less

than once every 3 years; and

     (c) Any other dam not less than once every 5 years.

     2.  The State Engineer may at any time

inspect, or require an owner to inspect, a dam under construction to determine

the condition of any element relevant to the safety of the dam, including,

without limitation:

     (a) The preparation of the foundation;

     (b) The placement and compaction of the material;

     (c) The construction of the outlet;

     (d) Armoring; and

     (e) Filling.

     3.  The State Engineer will send to the

operator:

     (a) A copy of each report of a safety inspection;

     (b) A list of repairs, if any, that are required;

and

     (c) A list of repairs or other maintenance, if any,

that are recommended.

     4.  If an operator fails to complete all

required repairs in a reasonable time or the State Engineer concludes that a

hazardous condition exists that may threaten life or property, the State

Engineer may order the operator to lower, drain or cease diverting water into

the reservoir until the operator satisfies the State Engineer that the repair

has been completed or the condition has been rectified.

     5.  If the State Engineer determines,

pursuant to subsection 3 of NRS

535.030, that immediate remedial action is necessary to safeguard life or

property, the State Engineer will:

     (a) Take such action;

     (b) Post, at the headworks of the dam, a notice

that states:

          (1) The telephone number and address of the

State Engineer’s office;

          (2) The specific action the State Engineer is

taking; and

          (3) The authority under which the State

Engineer is acting; and

     (c) Serve a copy of the notice on the operator at

the most recent address provided by the operator or owner.

     6.  The State Engineer may enter onto private

land for the purposes of administering this section.

     7.  The State Engineer may, pursuant to NRS 535.030, require an owner or

his or her designee to:

     (a) Submit to the State Engineer a proposed

schedule of inspections of the dam and any works appurtenant to the dam;

     (b) If the State Engineer approves the inspection

schedule, cause the inspections to be conducted;

     (c) Maintain records of all inspections and any

actions taken to correct any deficiencies identified; and

     (d) File with the State Engineer, not later than 30

days after each inspection, a copy of the report of the inspector.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.370  Operation and maintenance. (NRS 532.120)

     1.  An operator shall:

     (a) Operate and maintain his or her dam and works

appurtenant to the dam in a safe manner and in accordance with all applicable

permits, laws and regulations.

     (b) Take all necessary action allowed by law to

prevent the failure of the dam.

     (c) Notify the State Engineer and local responsible

authorities of any:

          (1) Problem or unusual event at the dam; or

          (2) Change in the name or address of an

operator or owner of the dam, reservoir, shoreline or water right associated

with the dam.

     (d) Modify his or her dam to meet changing

downstream hazard conditions or upstream watershed modifications.

     2.  If a dam has multiple owners, each owner

must be party to an agreement that allocates responsibility for the maintenance

of the dam and regulation of water impounded by the dam among all the owners. A

copy of the current agreement must be maintained in the office of the State

Engineer.

     3.  The State Engineer will direct

communications relating to a dam to the operator. Notice to the operator shall

be deemed notice to every owner.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.380  Transfer of approval to impound.

(NRS 532.120)

     1.  If there is an actual or proposed change

in the ownership of a dam for which an approval to impound, including a

temporary approval to impound, has been granted by the State Engineer, the new

or prospective owner may obtain the transfer to him or her of the approval to

impound.

     2.  The State Engineer will transfer the

approval to impound if:

     (a) The holder of the approval to impound consents

in writing to the transfer; and

     (b) The new or prospective owner of the dam

submits, in writing:

          (1) Proof that he or she is, or proposes to

become, an owner of the dam;

          (2) The date of the change in ownership; and

          (3) An acknowledgment that the new or

prospective owner has received a copy of the approval to impound that is in

effect and is aware of its terms, including, without limitation, any conditions

or restrictions on operation imposed by the State Engineer.

     3.  Nothing in this section affects any duty,

responsibility or other obligation to which a party to the transfer of the

approval to impound is otherwise subject pursuant to the provisions of this

chapter or chapter 535 of NRS.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.390  Violations. (NRS 532.120, 535.010, 535.050)  A person

who violates any provision of this chapter may, depending on the nature of the

violation:

     1.  Be assessed a civil penalty;

     2.  Be punished pursuant to subsection 8 of NRS 535.010; and

     3.  If the State Engineer orders the removal

of the dam pursuant to NRS 535.050,

be required to bear the expenses of such removal.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.400  Variances. (NRS 532.120)  The

State Engineer may, upon a showing of good cause, grant a variance from any

provision of this chapter, including, without limitation, an extension of time

to comply with any such provision.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.410  Exemptions. (NRS 532.120)  Nothing

in this chapter grants an exemption from any applicable federal, state or local

requirement.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

      NAC 535.420  Effective date of documents. (NRS 532.120)  An

application, correspondence, plan, report or other document submitted to the

State Engineer pursuant to this chapter takes effect on the day when a physical

copy is received in the office of the State Engineer and is stamped

accordingly.

     (Added to NAC by St. Engineer by R124-02, eff. 5-30-2003)

 
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