FLOOD02368

• County: Statewide
• Community: State of Colorado
• Basin: Statewide
• Title: Office of the State engineer Rules and Regulation for Dam Safety Construction
• Date: 8/26/1988
• Prepared For: State of Colorado
• Prepared By: Office of The State Engineer
• Floodplain - Doc Type: Educational/Technical/Reference Information

5.A.(4)(a) The evaluation of the effects of flood inundation in
the report shall extend at least to the location downstream where the
classification can be properly identified.

5.A.(4)(b) The report shall be submitted in a form acceptable
to the State Engineer and shall include but not be limited to:

1. Dam failure inundation maps (except inundation maps are
not required for minor dams located in remote areas where there is no
development downstream of the dam);

2. Cross-sections drawn to scale showing water surface
elevations at critical sections where structures are impacted as
described in the classification of dams. Cross-sections shall show
discharge in cubic feet per second, average velocity in feet per
second, and structures located in the flooded section;

3. A tabulation of assumed parameters including Mannings "n"
values for the floodplain;

4. A sensitivity analyses of the assumed "n" values and time
to fa il ure; and

5. References for all programs, data and documents used in
the evaluation.

5.A.(5) A hydrology report which complies with these rules, and
presents the inflow design flood for determining the spillway capacity.

5.A.(5)(a) The hydrology report shall be submitted in a form
acceptable to the State Engineer and shall include but not be limited
to the following information:

1. A topographical map showing the drainage area above the
dam with the drainage area delineated and noted in square miles; the
location of the proposed dam by quarter section, section, township,
range, and principle meridian; the bearing and distance from Station
0+00 on the dam to a section corner; the name of the stream impounded,
or indicate the dam is off stream and name the stream to which it is
tributary, or name the drainage basin in which the dam is located; the
elevation of the dam crest;

2. A description of the topography, geology, and vegetative
cover of the drainage area;

3. A summary of all hydrologic parameters for the method
used, the peak inflow design flood hydrograph, volume of flood, and
the hazard classification of the dam;

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