A certain watershed in Region VIII with an area of 60 ha flat heavy soil is to be converted into a mixed subdivision consisting of: 40% apartment dwelling areas 20% business neighborhood areas 20% playgrounds and parks 20% light industrial areas Using the rational method, estimate the percent change in peak runoff flow rates before and after the development. Refer to the table below for the values of runoff coefficients. Values of Runoff coefficients, C (Chow, 1962) Runoff coefficient, C Runoff coefficient, C Type of drainage area Type of drainage area Lawns: Sandy soil, flat, 2% Sandy soil, average, 2–7% Sandy soil, steep, 7% Heavy soil, flat, 29% Heavy soil, average, 2–7% Heavy soil, steep, 7% 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 0.25-0.35 Industrial Light areas Heavy areas Parks, cemeteries Playgrounds Railroad yard areas Unimproved areas Streets: Asphaltic 0.50–0.80 0.60-0.90 0.10-0.25 0.20–0.35 0.20–0.40 Business: Downtown areas Neighborhood areas Residential: Sinele family arcas 0.10-0.30 0.70-0.95 0.50-0.70 0.70-0.95 0 30-0 SO

A certain watershed in Region VIII with an area of 60 ha flat heavy soil is to be converted into a mixed subdivision consisting of: 40% apartment dwelling areas 20% business neighborhood areas 20% playgrounds and parks 20% light industrial areas Using the rational method, estimate the percent change in peak runoff flow rates before and after the development. Refer to the table below for the values of runoff coefficients. Values of Runoff coefficients, C (Chow, 1962) Runoff coefficient, C Runoff coefficient, C Type of drainage area Type of drainage area Lawns: Sandy soil, flat, 2% Sandy soil, average, 2–7% Sandy soil, steep, 7% Heavy soil, flat, 29% Heavy soil, average, 2–7% Heavy soil, steep, 7% 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 0.25-0.35 Industrial Light areas Heavy areas Parks, cemeteries Playgrounds Railroad yard areas Unimproved areas Streets: Asphaltic 0.50–0.80 0.60-0.90 0.10-0.25 0.20–0.35 0.20–0.40 Business: Downtown areas Neighborhood areas Residential: Sinele family arcas 0.10-0.30 0.70-0.95 0.50-0.70 0.70-0.95 0 30-0 SO

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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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.
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In the standard SCS-CN method of modelling runoff due to daily rainfall, if CN = 75, the runoff magnitude for a one-day rainfall of 100 mm is nearly A 17 mm B 31 mm C 41 mm D 57 mm
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Will the following rectangular channel (base = 8 ft, height = 3 ft) be able to provide adequate conveyance for the drainage area shown in the figure below? The channel roughness (n) is 0.02 and slope is 0.01 (ft/ft). Use the rational method and assume a runoff coefficient of 0.75 and rainfall intensity of 2.5 in/hr to calculate the runoff. 2,000 ft 700 ft Channel 500 ft
22.
Given the data below: Drainage area = 405 hectares Neglect base flow TIME Hr. 0 2 4 6 8 10 12 14 16 18 Determine the following a) Direct runoff depth (Dr) b) Unit hydrograph peak flow c) Effective duration ORDINATES OF FLOOD HYDROGRAPH cu.m/s 0 0.6 1.1 2.6 5.4 4 2.6 ft. 1.7 0.3 0 cm per cm of runoff ORDINATES OF 2HR UNIT HYDROGRAPH Per cm per runoff
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