7.23 A 45-min rainstorm occurs on a 9-acre urban area having a runoff coefficient of 0.7. The time of concentration has been calculated as 20 min. Incremental rainfall depths for the storm are given in the table below. Using a spreadsheet, calculate the runoff from the storm at 5-minute intervals. Plot the resulting hydrograph. Time (min) 0 10 15 20 25 30 35 40 45 50 55 60 65 70 Incremental Rainfall Depth (in.) 0 0.1 0.18 0.29 0.6 0.64 0.51 0.3 0.17 0.07 0 0 0 0 0

7.23 A 45-min rainstorm occurs on a 9-acre urban area having a runoff coefficient of 0.7. The time of concentration has been calculated as 20 min. Incremental rainfall depths for the storm are given in the table below. Using a spreadsheet, calculate the runoff from the storm at 5-minute intervals. Plot the resulting hydrograph. Time (min) 0 10 15 20 25 30 35 40 45 50 55 60 65 70 Incremental Rainfall Depth (in.) 0 0.1 0.18 0.29 0.6 0.64 0.51 0.3 0.17 0.07 0 0 0 0 0

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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Show full solution.According to rainfall data collected by a laboratory during storm events, the precipitation level in inches (X) varies jointly with runoff in cubic feet per second (Y). The joint probability mass function (PMF) of both variables are given by the following Table: Y 1 2 3 10 0.05 0.15 0 20 0.1 0.25 0.25 30 0 0.1 0.1 a. Determine and plot the marginal PMF of runoff.b. Determine the correlation coefficient between X and Y.
QUESTION 3 10 A storm with 10 cm precipitation produced a direct surface runoff of 5.8 cm in the equivalent depth unit. The time distribution of the storm is given in Table below. Estimate the @-index of the storm and the excess rainfall hyetograph. Time from start (hr) Incremental 0.4 rainfall in each hr (cm) 4 6. 0.9 1.5. 3.3 T.7 1.6 1.0 0.5
You have been given a 1-hour unit hydrograph (1 unit = 1 cm) and have been asked to use it to derive the surface runoff hydrograph for a 2-hour storm for which the total depth of rainfall excess was X cm and the intensity was constant. To derive it, you can: Multiply the ordinates of the 1-hour unit hydrograph by X/2 Find the 2-hour unit hydrograph and then multiply its ordinates X/2 Consider the storm as having two 1-hour periods of depth X/2 , multiply each 1-hour UH by X/2, lag them by 1 hour, and then add their ordinates. Multiply the ordinates of the 1-hour unit hydrograph by 2X
The rainfall intensity for each 20 min period are given below for a storm. The direct runoff from the basin is 2.5cm 20 MINUTES RAINFALL RAINFALL 1 2.5 2 5 a) What is the total storm rain? cm b) What is the Phi Ø index for the basin? 3 6.5 _cm/hr 4 3.5 5 1
5. From the 1mm 6 hour unity hydrograph given below, derive the 2 hour unit hydrograph. Time 12 18 24 30 (hrs) UH 15 8 3.6 0.6 0.0 (cumecs) What would be the peak surface runoff resulting from 3mm of rainfall falling in the space of two hours?
Runoff data have been collected for a 4-hour storm over a 120 acre watershed as indicated in the table. If the total volume of water infiltrated during the storm was 3.0 Ac-ft and the Phi Index is 0.1 in/hr, sketch the rainfall hyetograph with EVERYTHING labeled appropriately. Also, report the depth and volume of precipitation (in inches and Ac-ft, respectively) for each 1-hour period.
A storm with (7.75 cm) of precipitation produced a direct runoff of (3.5 cm). The duration of the rainfall was (6 hours) and its time distribution is given below. Estimate the ( index) of the storm. Time from start (hr) 1 2 3 4 5 6. Cumulative Rainfall (cm) 0.5 1.65 3.55 5.65 6.8 7.75
03: A flood was measured on a (240 km²) watershed the direct runoff from this flood amounted to (4.5 cm), the equivalent uniform depth of rainfall over watershed was (15 cm), and time distribution of rainfall is given in the table below. Find - Index and W-Index for this storm? Time (hr) I Rainfall (cm) 1.3 2 1.9 3 4.6 4 2.0 5 3.3 6 1.9
Question 4 The time of concentration of a 5.8ha catchment has been estimated as 33 minutes. Estimate the peak rate of runoff for a storm with an intensity of 49mm/hr and a duration of 22 minutes. Assume the coefficient of runoff as 0.61 and the time-area relationship to be linear. Present the result in the unit of m³/s and keep two decimal points (i.e to the accuracy of 0.01). Your Answer: Answer need it ASAP question 4
Question No. 03 A storm with 60 cm of precipitation produced a surface runoff of 33.2 cm. using the storm data shown in Table. Apply index approach to calculate. i) The constant rate of infiltration ii) Runoff coefficient Storm Duration (hrs) 3 9. 12 15 18 21 24 Depth of Rainfall (cm) 2.4 5.4 13.8 10.8 9.6 6. 3
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.
Q1: The following time distribution of the rainfall, estimate the -Index and W- Index of the rainfall if the surface runoff from this rainfall is (2 cm)? Time (hr) 2 3 4 5 Rainfall (cm) 1.2 1.5 0.9 0.6 1 0.5