FLOOD06560

• County: Denver
• Basin: South Platte
• Title: River Hydrology, Brown Ditch Weirs
• Date: 5/19/1986
• Prepared By: Wright Water Engineers, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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4

ing channel and floodplain conditions. The discharge profile developed for
the South platte below Chatfield Reservoir is shown on Figure 2. A hydro-
graph near Sanderson Gulch is shown in Figure 3.

Average River Discharge
The regime of the South Platte River can be characterized in terms of
average monthly flows at selected points. An analysis of the average
monthly flows over the period of record indicates that the flood control
reservoirs have modest effect on average monthly flows, but significant
effect on daily flows.

TABLE 3
TRIBUTARY BASIN PEAK INFLCM

Tributary

Peak 100-year Inflow
(cfs)

Dutch Creek
Big Dry Creek

7,400
12,600

TABLE 4
SOUTH PLATTE RIVER

PEAK FLOOD FLCMS

Discharge (cfs)
Location Recurrence Interval
2-Year 10-Year 50-Year 100-Year
D/S Dutch Creek * * 5,060 6,400
S, Platte @ Littleton * 3,100 6,170 7,940
D/S Big Dry Creek * 4,350 9,600 12,600
D/S Little Dry Creek * 5,750 12,200 16,000
D/S Cherry Creek 3,580 9,700 18,000 22,500
S. platte at 19th Ave. 3,580 9,700 lB,OOO 22,400
*Snowmelt and dam releases predominate