6-The six-hour unit hydrograph of a watershed having a drainage area equal to 393 km2 is as follows: Time (h) 0 6 12 18 24 30 36 42 Unit Hydrograph (m³/s*cm) 0 1.8 30.9 85.6 41.8 14.6 5.5 1.8 For a storm over the watershed having excess rainfall of 5cm for the first six hours and 15 cm for the second six hours, compute the streamflow hydrograph, assuming a constant base flow of 100 m 3 /s.

6-The six-hour unit hydrograph of a watershed having a drainage area equal to 393 km2 is as follows: Time (h) 0 6 12 18 24 30 36 42 Unit Hydrograph (m³/s*cm) 0 1.8 30.9 85.6 41.8 14.6 5.5 1.8 For a storm over the watershed having excess rainfall of 5cm for the first six hours and 15 cm for the second six hours, compute the streamflow hydrograph, assuming a constant base flow of 100 m 3 /s.

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

6-The six-hour unit hydrograph of a watershed having a drainage area equal to
393 km2 is as follows:
Time (h)
0 6
12
18
24
30
36 42
Unit Hydrograph (m³/s*cm) 0 1.8 30.9 85.6 41.8 14.6 5.5 1.8
For a storm over the watershed having excess rainfall of 5cm for the first six
hours and 15 cm for the second six hours, compute the streamflow
hydrograph, assuming a constant base flow of 100 m 3 /s.

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The following are the ordinates of the 4-hr unit hydrograph for a watershed: Time (hr) 0 2 4 6 Discharge (m/s) 0 20 50 75 i) Derive the 2-hr Unit hydrograph. ii) What is the area of the watershed? 8 90 10 40 12 0
A watershed of (30+X) km2 was subjected to a storm of 2-h duration from which the following information are recorded in Table a) Obtain a Unit Hydrograph for this watershed knowing that the base flow in the stream is estimated at 2 m3/s. b) Derive and plot 6-h Unit Hydrograph for the catchment area. Time (hours) 0 12345678 Discharge (m3/s) 2 15 30 37 30 22 16 12 2
Problem 3 The table below contains the data for a one-hour unit hydrograph. Time Q (hr) (cfs/in) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 145 246 359 979 432 246 134 65 32 0 (a) Determine the area of the watershed to which this unit hydrograph corresponds. Report your answer in acres. (b) Assume a very intense 3-hour storm occurs shortly after a rainy period, so the ground is very saturated. The runoff from the first one-hour interval of the storm totals 0.5 in., the runoff from the second one-hour interval is 2.5 in, and the runoff from the third one-hour interval totals 1.7 in. The baseflow during and after the storm is 80 cfs. Derive the storm hydrograph for this 3-hour storm. table that clearly indicates how you used the unit hydrograph, sample calculations Provide a with sufficient explanation, explanatory sketches, and a graph of the storm hydrograph. (c) Determine the peak discharge that will occur in the river if this 3-hour storm occurs.
Can you answer please? Be fast please
For a 14 hours storm, accumulated rainfall is given below. Time (hours) 02 4 6 8 10 12 14 Accumulated rainfall (cm)| 0 | 0.8 3.0 5.8 6.9 8.1 9.6 10.8 If $index for the catchment is 0.4 cm/h, then the intensity of effective rainfall at 8th hour will be cm/h.
Answer = 1130 cfs