Given below are the measured streamflow in cfs from a storm of 6-hour duration on a stream having a drainage area of 185 mi². Derive the unit hydrograph (UH) by the inverse procedure. Assume a constant baseflow of 550 cfs. Hour Day 1 Day 2 Day 3 Day 4 Midnight 550 5,000 1,900 550 6 am 600 4,000 1,400 Noon 9,000 3,000 1,000 6 pm 6,600 2,500 750

Given below are the measured streamflow in cfs from a storm of 6-hour duration on a stream having a drainage area of 185 mi². Derive the unit hydrograph (UH) by the inverse procedure. Assume a constant baseflow of 550 cfs. Hour Day 1 Day 2 Day 3 Day 4 Midnight 550 5,000 1,900 550 6 am 600 4,000 1,400 Noon 9,000 3,000 1,000 6 pm 6,600 2,500 750

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

Unit Hydrograph

Hydrology is the science which deals with the study of water on the earth’s surface. The word Hydrograph is derived from the word hydro which means water. Hydrograph is basically a graph in which the discharge is plotted against the time interval at a specific point in a river or other channel. In a hydrograph, the discharge is plotted along the y-axis and time interval is plotted along the x-axis. Hydrograph is used to estimate the runoff. The variations in discharges with the change in time is shown by a hydrograph. It was revealed that the total discharge at an outlet increases with time by a kinematic wave model.

Question

Given below are the measured streamflow in cfs from a storm of 6-hour duration on a stream having a drainage
area of 185 mi². Derive the unit hydrograph (UH) by the inverse procedure. Assume a constant baseflow of 550 cfs.
Hour
Midnight
Day 1
Day 2
Day 3
Day 4
550
5,000
1,900
550
6 am
600
4,000
1,400
Noon
9,000
3,000
1,000
6 pm
6,600
2,500
750

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Step 1: Given data

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Step 2: Calculating direct runoff hydrograph

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Step 3: Calculating volume of direct runoff hydrograph

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Step 4: Calculating unit hydrograph

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Step 5: Solution in table

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Step 6: plot the graph for measured flow, direct runoff hydrograph, and unit hydrograph Vs duration

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