FLOOD00959

• Designation Number: 143
• County: Denver
• Community: Denver
• Stream Name: Marston Lake North
• Title: Flood Hazard Area Delineation - Marston Lake North
• Date: 2/1/1979
• Designation Date: 3/18/1979
• Prepared For: Denver
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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elevation increase of no more than one-half foot. Floodway widths,

representing the limit of encroachment into the floodplain at each cross-

section used in the computation, are tabulated in Table IV. The water

surface elevations to be expected after encroachment are also tabulated.

REFERENCES

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1. City and County of Denver Wastewater Management Division, "Prelimi-
nary Study of the Marston Lake Area, March 1975."

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It should be noted that the flows of Table III were used in computing
the floodway data on Table V. The flow obstructions discussed in
Chapter IV are assumed to be non-existent, and therefore the full
design flows can be conveyed in the channel between cross-sections 128
and 128.

2. Denver Regional Council of Governments and Urban Drainage and Flood
Control, Rainfall-Runoff Information, Project Reuse, 1972.

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3. Environmental Protection Agency, Stormwater Management Model,
Volume III, as modified by Missouri River Division Corps of
Engineers, June 1973.

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4. Hydro-Triad, Ltd., "Drainage Study for Park West Filing 2,"
September 1973.

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Sununary

The report has identified the flooding limits of the 100-year flood for

future basin conditions with existing channel conditions. The report"

has also described the flood hazard associated with the 100-year flood

event.

5. Hydro-Triad, Ltd., "Drainage Study for Park West Filing 3,"
January 1978.

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6. Leonard Rice, Consulting Engineers, "Master Plan for Major Drainage:
Henry's Lake Area Project REUSE," October 1977.

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7. Leonard Rice, Consulting Engineers, '~rston Lake Area Flood
Hydrology," January 1976.

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Presently, the reach of Marston Lake North drainageway is considered

to have moderate flood damage potential. Some areas of the floodplain

have already been developed but much of the basin is still subject to

future development. The potential damage to the water treatment

facilities will increase with continued development upstream.

8. U.S. Army Corps of Engineers, HEC-2, Water Surface Profiles, 1976.

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