(2) Estimate the values of CN1, CN and CN|1 for a catchment with the following land use:Land useSoil groupSoil groupTotal % areaC (%)D (%)Cultivated land (Paddy)304575Scrub forest410Waste land9.6.15

Consider the figure shown below.

Answered: (2) Estimate the values of CN1, CN| and…

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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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…
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

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(2) Estimate the values of CN1, CN| and CN for a catchment with the following land use: Land use Soil group Soil group Total % area C (%) D (%) Cultivated land (Paddy) 30 45 75 Scrub forest 6. 4 10 Waste land 9. 15