Presentation on theme: "Stream morphology and hydrology. Hydraulic geometry B = aQ b h = cQ f U = kQ m Typical at a station values (midwestern streams) b = 0.25 f = 0.4 m = 0.35."— Presentation transcript:
Flood frequency (return period) Note: Find annual max on water year basis
If gage data are not available… USGS regional curves: multiple regression of flood frequency on basin area, other variables Gage analysis: estimation based on discharge records from nearby basins, correcting for basin area Literature: “prediction in ungaged basins”
Estimating flow duration curve in ungaged basins Assuming there is a gaged basin nearby (similar climate, vegetation, rock type, etc): Plot Q/Q2 vs % time exceeded for the gaged basin Estimate Q2 for the ungaged stream assuming Q2 = bankfull Q Estimate other % time exceeded for a given Q by multiplying the Q/Q2 value from the gaged curve by the Q2 value for the ungaged stream
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