Problem 3. A 50-ha 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 (na) 1 10 2 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 10-15 6. 15-20 4. 20-25 3 25-30 1

Problem 3. A 50-ha 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 (na) 1 10 2 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 10-15 6. 15-20 4. 20-25 3 25-30 1

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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Problem 3. A 50-ha catchment has the following time-area relationship. Estimate the runoff hydrograph (cumecs) using the time-area method for a 30-min rainfall hyetograph given. Time (min) Contributing area (ha) 10 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 8. 10-15 15-20 4 20-25 25-30 1
2) Assume the total runoff hydrograph was measured over 4 hours, in 30 minute intervals. The baseflow is 10 cfs and the watershed is 100 acres. Determine the 30 min unit hydrograph. Time (min) Runoff (cfs) 0 10 30 50 60 80 90 160 120 210 150 180 180 155 210 110 240 60
#3 E The rainfall was recorded at the network of stations over a trapezoidal watershed (see figure below). Determine and compare the average rainfall using: b) Thiessen polygon method Station ABCDEFG Precipitation (in.) 2.8 3.5 4.2 5.1 6.0 4.5 öö 3.9 85 mi 5 ml A 5 ml D 20 mi 5 mi в. 20 mi- 20 mi $5 mi 115 mi-. E 45 mi I 55 ml 45 mi 5 mi F G 5 mi 25 mi
For a precipitation event in a watershed of interest, Table 1 shows the Unit Hydrograph for 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 Hydrograph Unit Excess Time Time Hydrograph Rainfall (hrs) (ft³/(sec*in)) (hrs) (in) 1 36 1 0.3 2 92 2 0.2 3 63 3 1.1 4 18 5 5
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.)
Problem-1 A watershed is divided into sections as shown below. Runoff from each section will contribute to flow at gauge G as indicated in the table. For an excess rainfall intensity of 0.5 in/hr falling uniformly for 5 hrs, determine the resulting direct runoff hydrograph (DRO). D A C D Area [ac] 150 250 350 200 Time to G [hr] 2 4 G
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.
The ordinates of a hydrograph of surface runoff resulting from 4.5cm of rainfall excess of duration 8 hours in a catchment are as follows. Determine the ordinates of the 8h unit hydrograph for this catchment. Tabulate your solution and plot the 8H-UH.
1. Tables below show data of stream flow and rainfall observed for a particular watershed with an area of approximately 9552676.06 ft. Assume a baseflow of 75 cfs. 2. With this data, generate a unit hydrograph that can be used to estimate the stream flow for all rainfall amount. Gross Precipitation Observed Hydrograph cfs Time Hr Time in/h Hr 0-1 1.00 75 1-2 1.80 1 75 2-3 3.00 2 110 3-4 0.75 3 205 4 305 280 6 205 7 130 8 75 3. Determine the following: a. Direct runoff hydrograph b. Volume of direct runoff c. Effective rainfall d. Unit hydrograph e. Volume losses f. Ф- index g. Duration of effective rainfall (duration of the unit hydrograph)
02: Table below shows a rainfall data gathered from a storm occurred on a watershed area 2851 km² with direct runoff 856 m³/sec. Determine the W and index for this area and check the validity of your solution. Time (hrs) Rainfall 14.3 8.0 7.2 3.8 2.0 (mm) 1 2 3 4 5 6 7 8 1.3 1.0 0.0 9 0.8 10 11 12 13 0.0 13.9 17.2 2.0 14 15 0.9 1.5
1. Tables below show data of stream flow and rainfall observed for a particular watershed with an area of approximately 9552676.06 ft. Assume a baseflow of 75 cfs. 2. With this data, generate a unit hydrograph that can be used to estimate the stream flow for all rainfall amount. Time Gross Precipitation Observed Hydrograph cfs 75 Time Hr in/h Hr 0-1 1.00 1.80 1-2 1 75 2-3 3.00 2 110 3-4 0.75 205 305 3 4 280 205 7 130 8 75
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.