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Fish passage efficiency is the percent of fish that pass a project by non-turbine routes (spill, bypass, and sluiceway passage). FPE considers that fish pass mostly during the night and spill generally occurs at night. The simple fish routing is illustrated below in Fig. 61. A fraction of the fish are first diverted in to spill water. What remains is diverted into the turbine intake and a fraction of this flux is diverted into the fish bypass system.
The formula expressing FPE considers these independent diversions and accounts for the fact that fish may be attracted to spill flow over flows into the turbine. The simplified formula for FPE which considers spill occurs at night and most of the fish pass at night can be expressed
(151)
where
- D = fraction of fish that pass dam during spill hours
- Fsp = fraction of daily flow that passes in spill
- SE = fraction of fish that pass in spill relative to the fraction of flow passing in spill
- FGE = fraction of fish passing into turbine intake that are bypassed
The spill flow, in percent of the total flow, required to generate a given FPE can be expressed by arranging eq(151) to give
(152)
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Columbia River Salmon Passage Model CRiSP.1.5 Theory, Calibration & Validation Manual
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