For a precipitation event in a watershed of interest, Table 1 shows the Unit Hydrographfor the watershed on the left, and the excess rainfall at times 1, 2, and 3 on the right.Using the convolution method, find the direct and total runoff from the watershed.Assume the watershed has a constant baseflow of 8 ft³/sec.Table 1. Excess rainfall and Unit HydrographUnitExcessTimeTimeHydrographRainfall(hrs)(ft³/(sec*in))(hrs)(in)13610.329220.236331.141855

Answered: For a precipitation event in a…

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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A catchment area is presented in the Figure 1. Six rainfall gauges A, B, C, D, E and F are spread over this watershed and nearby. The inter isohyets areas I, II, II, IV and V are given as 20, 50, 70, 90, and 10 km? respectively. All the rainfall and isohyets are given in cm. Estimate the mean precipitation over this catchment area using arithmetic mean and isohyetal methods.
Sample Problem Given the following observed flows from a storm of 3-hr duration on a watershed with a drainage area of 10 sq. km. Assume that the base flow at the end of the runoff period is 6.0 cubic meters per second. TIME Q (hours) (m³/s) 1 6.0 2 15 3 25 4 21 5 13 6 6.0 1. Determine the direct runoff hydrograph by separating the baseflow. 2. Derive the unit hydrograph (for 1 centimeter of direct runoff) for the 3-hr rainfall.
The ordinates of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5 cm for the first six hours and 15 cm for the second six hours, compute the direct runoff hydrograph ordinates and plot the hydrograph. Compute the depth of direct runoff in cm. Assuming constant baseflow of 100 m^3/s, compute the storm hydrograph ordinates and plot the hydrograph. (List all the DRH ordinates in order, separated by a single space.)
2. The Friends Creek watershed has five rainfall gauges at the locations shown in the figure below. Total rainfall recorded at each gauge during a storm event is listed in the table. + Friends Creek C E w B Gage Rainfall (cm) A B C D E 6.0 7.8 9.2 4.1 3.0 Compute the mean areal rainfall (in centimeters) for this storm using: (a) Arithmetic averaging (b) The Thiessen method
A direct runoff hydrograph due to an isolated storm with on effective rainfall of 3.6 cm was trapezoidal in shape as shown in figure. The hydrograph corresponds to a catchment area of : Discharge (cumes) 100 cumes - 6 hours 78 hours Time (hr)
Example 7. A catchment of 200 hectares area has rainfalls of 7.5 cm, 2.0 cm and 5.0 cm in three consecutive days. The average index can be assumed to be 2.5 cm/day. Distribution- graph percentages of the surface runoff which extended over 6 days for every rainfall of 1-day duration are 5, 15, 40, 25, 10 and 5. Determine the ordinates of the discharge hydrograph by neglecting the base flow.
Q1. Based on 14 days runoff data given in TABLE Q1, determine the unit hydrograph for the catchment if the area is 4500 km2. Separate the baseflow by using appropriate method. TABLE Q1 Runoff Hydrograph Time (days) Runof(m's Time (days) Runoff(m's 1 II 2 10 4 4 2 15 12 2 6 18 13 7 16 14
The flowrate at the outlet of a watershed for 2-hr rain event is given in the table. Base flow is 20 cfs and the runoff depth is 2 inches. Determine 2-hr UH. Must use table format to show details of your solutions. time, hr Q, cfs 20 26 30 3 34 4 28 5 24 6 22 7 20 1. 2.
Followings are given for a watershed: Rational method coefficient C = 0.37 Time of concentration = 30 min Watershed Area = 4.7 km^2 Rainfall intensity is 1.8 cm/hr Part 1: CIA=? (Must show calculation details for Part 1) (For Parts 2 to 4, pick only one choice and fill that blank) Part 2: If rainfall duration is 15 min, the peak flowrate is: a. b. uncertain, but it is smaller than C. uncertain, but it is greater than Part 3: If rainfall duration is 30 min, the peak flowrate is: d. e. uncertain, but it is smaller than f. uncertain, but it is greater than Part 4: If rainfall duration is 60 min, the peak flowrate is: g. h. uncertain, but it is smaller than_ i. uncertain, but it is greater than
Estimate ∅-index for a watershed having an area 5 acres. The runoff volume caused by the rainfall is 56000 ft^3. Round off your answer to the nearest whole number. Indicate the unit. Plot the hyetograph and superimpose the final ∅-index. (1 acre = 43560 ft^2) * Using the rounded-off ∅-index, estimate the volume of infiltration losses in cubic feet. *
Problem 3. A 50-na catchment has the following time-area relationship. Estimate the runoff hydrograph (cfs) using the time-area method for a 30-min rainfall hyetograph given. Time (min) Contributing area (ha) 1 10 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 8 10-15 6. 15-20 20-25 3 25-30 1
Question 3 A watershed of 35 km? was subjected to a storm of 1h duration from which the following information are recorded in Table 2. a) Obtain a Unit Hydrograph for this watershed knowing that the base flow in the stream is estimated at 2 m°/s. b) Derive and plot 4 hours Unit Hydrograph for the catchment area. Table 2: Data for the time and Discharge Time (hours) 01 2 3 4 5 6 7 Discharge (m³/s) | 2 15 30 37 30 22 16 12 2

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