The 'Snyder''s synthetic unit hydrograph' parameters are derived from:
Choose the correct answer
Only rainfall data with no catchment area
Catchment physical characteristics (L, Lc, area) and regional coefficients Ct and Cp calibrated from nearby gauged catchments
Only streamflow records of the same river
Annual rainfall totals only
Correct Answer
B. Catchment physical characteristics (L, Lc, area) and regional coefficients Ct and Cp calibrated from nearby gauged catchments
Why is this the answer?
Snyder (1938): tp = Ct(L×Lc)^0.3 (lag time), Qp = 2.78Cp×A/tp (peak discharge). Ct (0.4–0.8) and Cp (0.4–0.8) are regional parameters calibrated from gauged catchments in the region. L = length of main stream, Lc = length to centroid of catchment. Used for ungauged catchments to estimate design flood hydrograph.
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