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.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

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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Step 2: Calculating the required parameters

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Step 3: Calculating the ordinates of hydrograph

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Step 4: Calculating the 2 hr unit hydrograph

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Step 5: Calculating the ordinate of s curve

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