Compute the runoff from a 5-in. rainfall from a watershed which has four soil groups overall and the land cover is fair grass cover. Also, estimate the effect of urbanization if the land cover changed into four urban categories as shown below: Land Use Land use Soil Group CN CN Before Urbanization After urbanization Before Urbanization After Urbanization Grass Residential 40% C 79 83 Grass Grass 25% D 83 80 Grass Commercial C 79 94 20% Grass Industrial 15% D 83 93

Compute the runoff from a 5-in. rainfall from a watershed which has four soil groups overall and the land cover is fair grass cover. Also, estimate the effect of urbanization if the land cover changed into four urban categories as shown below: Land Use Land use Soil Group CN CN Before Urbanization After urbanization Before Urbanization After Urbanization Grass Residential 40% C 79 83 Grass Grass 25% D 83 80 Grass Commercial C 79 94 20% Grass Industrial 15% D 83 93

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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Question

Compute the runoff from a 5-in. rainfall from a watershed which has four soil groups overall and
the land cover is fair grass cover. Also, estimate the effect of urbanization if the land cover
changed into four urban categories as shown below:
Land Use
Land use
Soil Group
CN
CN
Before Urbanization After urbanization
Before Urbanization After Urbanization
Grass
Residential 40%
C
79
83
Grass
Grass 25%
D
83
80
Grass
Commercial
C
79
94
20%
Grass
Industrial 15%
D
83
93
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A watershed is 30% meadow (good condition) and 70% commercial and business areas (85% impervious). The watershed has 50% soil group C and 50% soil group D. Calculate the weighted Curve Number for the whole watershed. (CN for different land uses and Hydrologic Soil Groups are provided in the table below (Table 2-1 of the textbook)). Land Use Description Cultivated land¹ Without conservation treatment With conservation treatment Pasture or range land Poor condition Good condition Meadow Good condition Wood or forest land Thin stand, poor cover, no mulch Good cover² Open spaces, lawns, parks, golf courses, cemeteries, etc. Good condition: grass cover on 75% or more of the area Eric Fair condition: grass cover on 50%-75% of the area Commercial and business areas (85% impervious) Industrial districts (72% impervious) Residential³ Average lot size 1/8 ac or less 1/4 ac 1/3 ac 1/2 ac 1 1 ac Paved parking lots, roofs, driveways, etc.5 Streets and roads Paved with curbs and storm sewers Gravel…
22.
A 300 acre watershed just south of Chicago is currently undeveloped (woods). The soils are primarily clay, the hydraulic length of the watershed is 6560 ft, and the average lank slope is 1%. Determine the SCS synthetic UH before development and finish the table below. Solution: from Table 11.7; 1. For clay soil with woods cover, CN= 2. The soil moisture deficit S = in; 3. For a watershed with hydraulic length, time of concentration Te= hr min; 4. Time to peak Tp= min: 5. Peak discharge Op= cfsjin; 6. Storm duration is AD= hr= min; 7. The -min UH is displayed below using Table 11.11; Flow Time Time Ratios Flow Ratios (min) (cfs) (t/tp) (9/ap) 21 13 0.1 0.2 40 42 0.31 0.4 0.66 0.6 0,93 0.8 125 121 0.93 1.2 102 146 1.4 0.78 167 73 0.56 1.6 51 188 0.39 1.8
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