Question No. 04 Compute the following parameters for a storm with 60 cm of precipitation produced a surface runoff of 33.2 cm by applying o index approach using the storm data shown in Table: 1. The constant rate of infiltration 2. Runoff coefficient Storm Duration (h) Depth of Rainfall (cm) 3 12 15 18 21 24 2.4 5.4 9 13.8 10.8 9.6 3

Question No. 04 Compute the following parameters for a storm with 60 cm of precipitation produced a surface runoff of 33.2 cm by applying o index approach using the storm data shown in Table: 1. The constant rate of infiltration 2. Runoff coefficient Storm Duration (h) Depth of Rainfall (cm) 3 12 15 18 21 24 2.4 5.4 9 13.8 10.8 9.6 3

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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Analysis of rainfall and runoff records for a certain storm over a basin (of area 3210 km²) gave the following data: Rainfall for successive 2 hr periods: 2.5, 6.5 and 4.5 cm/hr. Direct surface discharge at the concentration point for successive 2-hr periods: 400, 1200, 4500, 7700, 12000, 10220, 8260, 3900, 838 and 400 m’. Derive the unit hydrograph for the catchment area.
Net Storm Rainfall Example 2-1 Rain falls as shown in the rainfall hyetograph (intensity Vs. time) in Fig. E2-1 (a). The o index for the Storm is 0.5 in./hr and is constant over 5 hr. Plot the net rainfall on the hydrograph (flow vs. time) given in Fig. E2-1 (a). Determine the total volume of runoff and the watershed area. 1cfs = 1.008 ac-in/hr 2.0 1.5 1.0 0.5 1 3. 4 Time (hr) 700 600 500 400 300 200 100 4 8 12 16 20 24 Time (hr) Time (hr) Q (cfs) Volume (cfs-hr) 0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-24 24-26 16 Q (cfs) iT (in./hr)
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Problem 2 A watershed having an area of 28 km² records the following rainfall data. Time Rainfall Time Rainfall (mm) 0.6 (mins) 150 180 210 (mins) 30 (mm) 3.4 60 1.1 2.2 90 1.7 1.3 120 2.5 240 0.2 Determine the infiltration rate (in mm/hr) using the o-index method if the runoff volume was found to be 224,000 m³.
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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.)
1. A 160-acre drainage basin has the following characteristics: Land Use Residential, flat, 60% impervious Residential, flat, 30% impervious Concrete or sheet asphalt pavement Turf Meadows Forested Area * for a range of values, the runoff coefficient can be calculated as an average value. Rainfall Intensity (in/hr) Find the peak runoff from the drainage area for a 20-minute duration storm with a return frequency of 25-years? 20 18 16 14 2 0 0 Frequency (years) 100 50 25 10 10 Area % 20 30 5 25 20 20 30 Duration (min) Coefficient (C)* 0.55 0.40 0.85 0.25 0.2 40 50 60
%VY . Q1: A catchment area is 5 square miles and the total direct Runoff (E D. R = 11150 ft / sec). Estimate the base flow for the data shown in the table below? Time 2 3 4 5. 6. 500 500 1200 2250 2920 2670 2060 1430 Total Flow(ft/sec) 202.57 | 506.43 700.32 627.97 451.44 269.13 11 U.H 10 1100 910 Time 9 12 13 14 15 16 Total 780 650 530 510 510 500 Flow(ft'/sec) U.H 173.6 118.65 81.03 52.09 28.94 11.57 2.89 Q2: Develop a 3-hr synthetic unit hydrograph for the catchment are using Snyder's method only. If the catchment area is 400 kan?, L= 25 kam and La km, assuming C15 and C,-0.7 •,.0 |||||||||||||1||||||| إلغاء إعادة تعي ين
Subject water resource