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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 Runolf Type of drainage area Type of drainage area coefficient, C Lawns: Sandy soil, flat. 2% Sandy soil, average, 2-7% Sandy soil, steep, 7% Heavy soil, flat, 2% Heavy soil, average, 2-7% 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 Industrial Light areas Heavy areas Parks, cemeteries 0.50-0.80 0.60-0.90 0.10-0.25

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 Runolf Type of drainage area Type of drainage area coefficient, C Lawns: Sandy soil, flat. 2% Sandy soil, average, 2-7% Sandy soil, steep, 7% Heavy soil, flat, 2% Heavy soil, average, 2-7% 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 Industrial Light areas Heavy areas Parks, cemeteries 0.50-0.80 0.60-0.90 0.10-0.25

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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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, 2% Heavy soil, average, 2-7% Heavy soil, steep, 7% Business: Downtown areas Neighborhood areas Residential: Single-family areas Multiunits, detached Multiunits, attached Suburban Apartment dwelling areas Industrial Light areas Heavy areas Parks, cemeteries Playgrounds Railroad yard areas Unimproved arcas Streets: Asphaltic Concrete Brick 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 0.25-0.35 0.50-0.80 0.60-0.90 0.10-0.25 0.20-0.35 0.20-0.40 0.10-0.30 0.70-0.95 0.50-0.70 0.70-0.95 0.80-0.95 0.70-0.85 0.30-0.50 0.40-0.60 0.60-0.75 0.25-0.40 0.50-0.70 Drives and walks 0.75-0.85 Roofs 0.75-0.95
Transcribed Image Text: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, 2% Heavy soil, average, 2-7% Heavy soil, steep, 7% Business: Downtown areas Neighborhood areas Residential: Single-family areas Multiunits, detached Multiunits, attached Suburban Apartment dwelling areas Industrial Light areas Heavy areas Parks, cemeteries Playgrounds Railroad yard areas Unimproved arcas Streets: Asphaltic Concrete Brick 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 0.25-0.35 0.50-0.80 0.60-0.90 0.10-0.25 0.20-0.35 0.20-0.40 0.10-0.30 0.70-0.95 0.50-0.70 0.70-0.95 0.80-0.95 0.70-0.85 0.30-0.50 0.40-0.60 0.60-0.75 0.25-0.40 0.50-0.70 Drives and walks 0.75-0.85 Roofs 0.75-0.95
Values of Runoff coefficients, C (Chow, 1962) Runoff Runoff coefficient, C Type of drainage area coefficient, C Type of drainage area Lawns: Sandy soil, flat, 2% Sandy soil, average, 2-7% Sandy soil, steep, 7% Heavy soil, flat, 2% Heavy soil, average, 2-7% Heavy soil, steep, 7% Business: Downtown areas Neighborhood areas Residential: Industrial Light areas Heavy areas Parks, cemeteries Playgrounds Railroad yard areas Unimproved areas Streets: Asphaltic Concrete Brick Drives and walks 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 0.25-0.35 0.50-0.80 0.60-0.90 0.10-0.25 0.20-0.35 0.20-0.40 0.70-0.95 0.50-0.70 0.10-0.30 0.70-0.95 0.80-0.95 0.70-0.85 Single-family areas Multiunits, detached Multiunits, attached Suburban Apartment dwelling areas 0.30-0.50 0.40-0.60 0.60-0.75 0.25-0.40 0.50-0.70 0.75-0.85 Roofs 0.75-0.95
Transcribed Image Text:Values of Runoff coefficients, C (Chow, 1962) Runoff Runoff coefficient, C Type of drainage area coefficient, C Type of drainage area Lawns: Sandy soil, flat, 2% Sandy soil, average, 2-7% Sandy soil, steep, 7% Heavy soil, flat, 2% Heavy soil, average, 2-7% Heavy soil, steep, 7% Business: Downtown areas Neighborhood areas Residential: Industrial Light areas Heavy areas Parks, cemeteries Playgrounds Railroad yard areas Unimproved areas Streets: Asphaltic Concrete Brick Drives and walks 0.05-0.10 0.10-0.15 0.15-0.20 0.13-0.17 0.18-0.22 0.25-0.35 0.50-0.80 0.60-0.90 0.10-0.25 0.20-0.35 0.20-0.40 0.70-0.95 0.50-0.70 0.10-0.30 0.70-0.95 0.80-0.95 0.70-0.85 Single-family areas Multiunits, detached Multiunits, attached Suburban Apartment dwelling areas 0.30-0.50 0.40-0.60 0.60-0.75 0.25-0.40 0.50-0.70 0.75-0.85 Roofs 0.75-0.95
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