Please only answer if sure it is correct. will thumbs up if correct! Using the Kirpich time concentration of 1.46 min, assuming the watershed is in Seattle,WA, determine the intensity of the 50 year storm.Paved area, 0.7 km²C=0.9Bare surface, 0.8 km²C=0.6200 mS=Drain500 mV = 1.2 m/sFigure 2.7 Map of similar rainfall characteristics (from Steel and McGhee, 1979).AreaArea 3AreaAreaArea 2Area 1Table 2.8 Intensity-Duration Constants for Various Regions*Frequency(years)Area 12 A- 206Area 2139.75Area 3Area 4Area 5Area 6Area 710270706831.98- 302117נו1614115 A= 246.9190.2131.196.981.1748488 2925191613121210 A300229.917011112259.88- 3629231617231325 A=326.82598229.9170129.9155.166.98= 3332302717261050 A= 3153502501871871598658- 2838272425218100 A-366.9374.82902202402209.877.28- 33363128292610

the solution is provided in the image thank you.Explanation:

Answered: Using the Kirpich time concentration of…

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 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.
a) Determine the unit hydrograph for Gilmore Creek from the observed runoff (note: the area of the watershed is 8.95 mi?). Assume that this unit hydrograph resulted from a 0.5-hour period of uniform rainfall excess. TIME, hr Q, cfs 12.4 DATE TIME, hr Q, cfs DATE 31-Jul 16 3.92 31-Jul 21.5 22 12 16.5 31 22.5 12 17 1370 17.5 270 23 12 18 100 23.5 11.65 18.5 48 24 11.3 19 34 1-Aug 0.5 10.75 19.5 26.6 1 10.2 20 24 1.5 9.52 20.5 16.9 2 8.85 21 12.8 2.5 8.4 7.96
Question A 4-hour rainfall in a catchment of 250 km² produces rainfall depths of 6.2 cm and 5 ❤ cm in successive 2-hour unit periods. Assuming the index of the soil to be 1.2 cm/hour, the runoff volume is A 1.6 ha-m B D 16 ha-m 160 ha-m 1600 ha-m
Q3: A river catehment has a 2.0 hour unit hydrograph with the ordinates 0,3,11,35,55,66,63,40,22,9 and 2 m'/sec. Assume that the base flow at time t=0 hour is 50 m/sec and linearly increases to 74 m'/sec at t=24 hour. Compute the hydrograph resulting from two successive 2.0 hour periods of effective rainfall of 2.0 cm and 3.0 cm respectively.
Consider the following data for a storm over catchment: 1. Total rainfall = 67.5 mm 2. Runoff depth = 57.5 mm 3. -index = 0.125 cm/hr The rainfall duration will be hr.
#3 E The rainfall was recorded at the network of stations over a trapezoidal watershed (see figure below). Determine and compare the average rainfall using: b) Thiessen polygon method Station ABCDEFG Precipitation (in.) 2.8 3.5 4.2 5.1 6.0 4.5 öö 3.9 85 mi 5 ml A 5 ml D 20 mi 5 mi в. 20 mi- 20 mi $5 mi 115 mi-. E 45 mi I 55 ml 45 mi 5 mi F G 5 mi 25 mi
(CHIN 3rd ed, 3.35) A stormwater outfall discharges runoff into a pristine river with negligible dissolved solids such that the suspended solids concentration of the combined water just downstream of the outfall if 100 mg/L. The settling velocity of the suspended solids is estimated to be 2 m/d, the flow velocity in the river if 0.4 m/s and the river is 10 m wide and 2 m deep. 1. Estimate how far downstream from the outfall will it be before all of the suspended solids settle out.Estimate the rate at which sediment is accumulating downstream of the outfall.
2) Compute the peak runoff, qp, using the NRCS Methbd for a 100 year storm for a drainage basin located near Atlanta, Georgia, and having the following parameters: Am 1.413 s.m. CN = 68.0 tc = 2.35 hours
3. For a 2 hour, 8 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 500 km² Table: Propeller readings Time 0 flow rate (m³/s) 8 2 4 6 14 18 30 8 10 12 45 38 28 14 16 18 20 22 24. 18. 14 10 a) Obtain 2 hour unit - hydrograph for the considered flow section b) Obtain 4 hour unit- hydrograph for considered flow section. c) Obtain the hydrograph of a rainfall with 4 hour duration and 10 mm/h intensity. 24 8 8
The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The index for the catchment is taken as 0.2 cm/hour. The 2 hour unit hydrograph ordinates are given in table below. Time in hrs. Discharge m 0 2 4 m³/sec 0 10 40 6 14 16 70 50 20 10 6 0 Base flow can be taken as 7 m³/sec at the beginning of the storm linearly increasing to 9 m³/sec at 10 Hrs. after the beginning and then linearly decreasing to 8 m³/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph. 8 10 12
4) Compute the peak runoff, Qp, for a 15 year storm using the Rational Method for a drainage basin located in Atlanta, Georgia, and having parameters as follows: A = 14.06 Acres Impervious: 0.06 acres Grass: 6.5 acres Woods: 7.5 acres Overland Flow: Average Grass, 100' long, 5.0% slope Shallow Concentrated Flow: 50' long, 7.0% slope
a) Table shows total rainfall for each month of the year 2012 for a 200 m² sub- basin located upstream. If the average daily evaporation is considered as 2 mm/day throughout the year and total runoff generated is 70% of the total rainfall, determine the amount of water stored or infiltrate in the sub-basin on average each month in unit m?. Consider the rainfall to be uniformly distributed across catchment and use 30 days for each month in the calculation. Month 4 5 6 1 2 7 8. 10 11 12 Total rainfall (mm) 45 14 24 13 20 24 17 25 21 37 43 65

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