Wisconsin Administrative Code › Department of Natural Resources › NR 300-399 - Environmental Protection - Water Regulation › Chapter NR 333 - Dam design and construction › Section NR 333.05 - Submission of plans, specifications and analyses

Current through June 24, 2024
(1) PLANS AND
				SPECIFICATIONS. Plans and specifications prepared by a professional engineer
				registered in the state of Wisconsin shall be submitted to and approved by the
				department prior to the construction of a new dam or reconstruction of an
				existing dam.
(2) HYDRAULIC,
				HYDROLOGIC AND STABILITY ANALYSES. Hydraulic, hydrologic and stability analyses
				prepared by a professional engineer registered in the state of Wisconsin shall
				be submitted to and approved by the department prior to the construction of a
				new dam or the reconstruction of an existing dam. These analyses shall be
				conducted according to accepted engineering practice and unless the department
				determines otherwise shall be submitted in the form of a report which includes,
				at a minimum:
(a) Purpose of the report.
				Development of an emergency action plan, floodplain zoning or development of
				the hazard rating for the dam.
(b)
				Roles and participation of other agencies - DNR, DEG, community officials,
				other agencies.
(c) Data collection
				methods and sources of information - Development of cross sectional data,
				description of past flooding events, reference to previous studies, current
				floodplain zoning map.
(d)
				Methodologies and procedures - Operation of dam during high water, breach
				parameters, description of all spillway components, scenario for failure,
				failure conditions.
(e) Regional
				flood flows calculated in conformance with the standards in s.
				NR
				116.07(3).
(f) Hydraulic modeling - Determination and
				delineation of the following hydraulic conditions during the regional flood,
				using the standards in s.
				NR
				116.07(4):
1. Hydraulic shadow - assuming that the dam
				is in existence and fails. Failure shall be considered to occur at the maximum
				upstream water elevation or at the point of overtopping, based upon the
				physical conditions at the dam.
2.
				Dam in place, no failure - assuming the dam operates in accordance with its
				department approved operation plan, if one is available, or not operated if
				there is no plan.
3. Dam
				nonexistent - assuming the dam has been removed and the natural stream
				cross-section is restored.
Note: For suggested dam breach parameters, see the National
				  Weather Service "DAMBRK or FLDWAV" Users Manuals.
(g) Comparison table - Summary by cross
				section of the maximum flood elevation for the 3 hydraulic
				conditions.
(h) Determination of
				the dam hazard rating using the criteria in s.
				NR
				333.06.
(i) Design flood flows, based on the hazard
				rating and the hydraulic design standards in s.
				NR
				333.07.
(j) Calculations for routing of the design
				flood through the structure. Starting conditions for the routing shall be at
				the normal pool and normal flow tailwater elevations.
(k) Stability analysis of the dam, which
				considers sliding, overturning and foundation failure during base flow
				conditions and at maximum load conditions, including ice loading, during
				routing of the design flood through the dam.
(L) Appendices:
1. Plan view of the dam.
2. Elevation view of the dam from downstream
				including breach geometry.
3.
				Pertinent elevations of the dam.
4.
				Stage vs. storage curve or area vs. volume curve, or both.
5. Spillway capacity rating curves or
				calculations, where appropriate.
6.
				Downstream water surface profiles and floodway data tables, for the dam
				failure, and the with and without dam conditions, during the regional
				flood.
7. Maps for the 3 modeled
				conditions, with cross section locations and structure identification adequate
				to determine the hazard rating for the dam, for the dam failure condition map,
				showing the floodway, and to an appropriate scale consistent with the community
				floodplain zoning map.
8. Cross
				section plots of actual field cross sections and comparison with dam break
				input cross sectional data.
9. Hard
				copy and data disk with computer input and output for all modeled conditions,
				including hydrology and hydraulic runs.
10. Other supporting calculations as the
				department deems necessary.
Note: Mapping, profiles and floodway data tables must be
				  suitable for zoning purposes, as required in s.
				  NR
				  116.07(4).