What is the weighted CN for a watershed that is 10% lawns and parks (grass cover on 80% of the area) and 90% commercial areas, considering that the watershedhas 70% soil group A and 30% soil group D equally divided in both land cover types? (Assume antecedent soil moisture condition number II)

To calculate the weighted Curve Number (CN) for the watershed, we first need to calculate the CN…

Answered: What is the weighted CN for a watershed…

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 Palm Spring golf course has requested a permit to install a 40000 ft2 pond to enhance the beauty of its facilities. Since the evaporation rates are very high in Palm Springs, it is likely they will need to pump a lot of groundwater to keep the pond full. The city has hired you (a water resources engineer) to determine how much water needs to be pumped per year in order to keep the pond filled. There is a small creek that discharges an average of 0.25 m3/s into the pond. The outlet valve from the pond releases an average rate of 0.30 m3/s (to keep the pond from getting stagnant). Precipitation on the pond is 260 mm/year, and the annual evaporation is estimated to be 105 inches/year. The pond will be lined with concrete to prevent any drainage or seepage from the bottom. Using a water balance, what volume (on average) of groundwater (in cubic meters) must be added to the lake each year to keep the pond at a constant level? Draw a schematic of the problem to identify the control volume…
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…
Determine the following: a.The WQDvfor the basin b.The volume and water surface elevation of the micropool c.The water surface elevation of the WQDv d.The size of the water quality outletorifice
List 3 qualities required of groundwater of which supply depends on its purpose
As its relates to Jamaica answer the following, also include references. 1.How relevant are NEPA’s concerns about alkalinity, acidity and oxygen levels? 2.Rainfall is naturally somewhat acidic, since pure water in equilibrium with atmosphericcarbon dioxide forms a weak solution of carbonic Acid, with a pH of ~5.6. How is AcidRain (pH<5.6) naturally countered in fresh surface water bodies? 3.What is the inherent danger when this counteractive measure is in effect?
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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What is the weighted CN for a watershed that is 10% lawns and parks (grass cover on 80% of the area) and 90% commercial areas, considering that the watershed has 70% soil group A and 30% soil group D equally divided in both land cover types? (Assume antecedent soil moisture condition number II)