Example-1A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are asfollows.Sub Area(km²)1525355Index(mm/hour)101521161st hour16161215Hourly Rain (mm)2nd hour484240423rd hour222018184th hour10Calculate the runoff from the catchment and the hourly distribution of the effectiverainfall for the whole catchment.

area km2 loss @ mm/hour 1sthour rainfall in mm hour 2ndhour rainfall in mm hour 3rd hour rainfall in…

Answered: A 4-hour storm occurs over an 80 km²…

A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as follows. Sub Area (km²) 15. Index (mm/hour) 10 1st hour 16 Hourly Rain (mm) 2nd hour 3rd hour 48 22 4th hour 10

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

Example-1
A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as
follows.
Sub Area
(km²)
15
25
35
5
Index
(mm/hour)
10
15
21
16
1st hour
16
16
12
15
Hourly Rain (mm)
2nd hour
48
42
40
42
3rd hour
22
20
18
18
4th hour
10
Calculate the runoff from the catchment and the hourly distribution of the effective
rainfall for the whole catchment.

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Step 3: total ER for area in mm

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Step 4: Hourly distribution of ER

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