1. Measured total hourly discharge rates from a 2.48 mi² drainage basin are tabulated below. The hydrograph was produced by a rainstorm having a uniform intensity of 2.60 in/hr starting a 9 a.m. and abruptly ending at 11 a.m. The baseflow from 8 a.m. to 3 p.m. was a constant 100 cfs. t (hr) Q (cfs) 8 a.m. 100 9 100 10 300 11 450 12 300 1 p.m. 2 150 100 3 100 (a) Derive a 2-hour unit hydrograph from the data. (b) Derive a 4-hour unit hydrograph from the 2-hour unit hydrograph using the S-Curve.
1. Measured total hourly discharge rates from a 2.48 mi² drainage basin are tabulated below. The hydrograph was produced by a rainstorm having a uniform intensity of 2.60 in/hr starting a 9 a.m. and abruptly ending at 11 a.m. The baseflow from 8 a.m. to 3 p.m. was a constant 100 cfs. t (hr) Q (cfs) 8 a.m. 100 9 100 10 300 11 450 12 300 1 p.m. 2 150 100 3 100 (a) Derive a 2-hour unit hydrograph from the data. (b) Derive a 4-hour unit hydrograph from the 2-hour unit hydrograph using the S-Curve.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. Measured total hourly discharge rates from a 2.48 mi² drainage basin are tabulated
below. The hydrograph was produced by a rainstorm having a uniform intensity of 2.60
in/hr starting a 9 a.m. and abruptly ending at 11 a.m. The baseflow from 8 a.m. to 3 p.m.
was a constant 100 cfs.
t (hr)
Q (cfs)
8 a.m.
100
9
100
10
300
11
450
12
300
1 p.m.
150
2
100
3
100
(a) Derive a 2-hour unit hydrograph from the data.
(b) Derive a 4-hour unit hydrograph from the 2-hour unit hydrograph using the S-Curve.
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