Determination of Discharge Capacity and Number of Spillways
The maximum discharge capacity and the number of spillways are determined by studying the following factors: By studying the flood hydrograph of past ten years, the maximum flood discharge may be computed which is to be disposed off completely through the spillways. The water level in the reservoir should never be allowed to rise above the maximum pool
Parameters considered in Designing Spillways
The topography, hydrology, hydraulics, geology and economic considerations all have a bearing on these decisions. For a given inflow flood hydro graph, the maximum rise in the reservoir level depends on the discharge characteristics of the spillway crest and its size and can be obtained by flood routing. Trial with different sizes can then help in getting the optimum combination
Spillway Control Devices - FlashBoards and Stop Logs
The simplest form of control for a spillway is the free, or uncontrolled, overflow crest, which automatically releases water whenever the reservoir water surface rises above crest level. The advantages of the uncontrolled crest are the elimination of the need for constant attendance and regulation of the control devices by an operator and the freedom from maintenance
