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HYDRAULIC SIZING OF THE DETENTION BASIN OUTLET WORKS
1 .
The hydraulic sizing of the Detention Basin outlet works
considered two major goals. First to reduce the estimated 100-
;; yr, 6 -hr inflow hydrograph, to a discharge less than 2500 cfs, as
required by the RDFC&WCD. Second, to provide a spillway with
capacity to pass the estimated 10,000 -yr. 6 -hr inflow hydrograph,
with 1.5 feet of freeboard, as required by the DWR's Division of
Safety of Dams.
A 12' x 7' x 166.41' reinforced concrete box was selected to
serve as principal spillway. The elevation- discharge
relationship for this box were computed using the methods
presented in Reference 5 and Reference 6.
A 250 ft. long broad - crested weir was selected for the emergency
spillway. The spillway crest elevation was set at 843 ft. The
capacity was computed using the weir formula presented in
Refernce 6.
,I t
Table 4 shows the Elevation - Area - Storage- Discharge relationships
developed for the proposed Dentention Basin.
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