please answer for manhole B A 27-acre drainage basin comprising of seven sub-catchments is shown in Fig. 1. Determine the design flows (Q) entering manholes A, B,Ga.C, and E in cfs for a 5 year return period. The area, runoff coefficient and inlet time for each sub-catchment is shown in Table 1; thelength and slope for each pipe in Table 2. Use the rainfall intensity equation i = 1207 where i is the rainfall intensity in inches/hr, T isTa+27the return period and T, is the duration in minutes.IIAIIIVVpusEВVIVII Table 1. Characteristics of the drainage basinCatchmentAreaRunoffCoeficienthettime(acres)Ct(min)20.750.77II40.610IV40.610V0.515VI4.50.515VII4.50.515Table 2. Pipe characteristicsSlope(S,)SewerLength(ft)DiameterPipe(ft)ЕВ4501.750.0064АВ55020.0081BC40030.0064CD4503.50.0064

A = 27 acre T = 5 years return i=120T0.175Td+27=0.015 Pipe Length slope EB 450 0.0064 AB 550…

A 27-acre drainage basin comprising of seven sub-catchments is shown in Fig. 1. Determine the design flows (Q) entering manholes A, B, C, and E in cfs for a 5 year return period. The area, runoff coefficient and inlet time for each sub-catchment is shown in Table 1; the length and slope for each pipe in Table 2. Use the rainfall intensity equation i = 1207.170 Ta+27 where i is the rainfall intensity in inches/hr, T is the return period and T is the duration in minutes. A II IV V E В VI II

A 27-acre drainage basin comprising of seven sub-catchments is shown in Fig. 1. Determine the design flows (Q) entering manholes A, B, C, and E in cfs for a 5 year return period. The area, runoff coefficient and inlet time for each sub-catchment is shown in Table 1; the length and slope for each pipe in Table 2. Use the rainfall intensity equation i = 1207.170 Ta+27 where i is the rainfall intensity in inches/hr, T is the return period and T is the duration in minutes. A II IV V E В VI II

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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The observed rainfall and discharge of a catchment is given the table. The catchment area is 0.23Km^2. Time (h) 1 2 3 4 5 6 7 8 00 9 10 11 12 13 Rainfall (mm) 0 0 2 6 10 8 2 0 0 0 0 0 0 1. Estimate the base flow. 2. Estimate the surface runoff. 3. Estimate the initial loss 4. Estimate the continuous loss using phi method. Discharge (M3/s) 20 20 20 20 30 50 40 35 25 21 20 20 20
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Problem 1. The following are the ordinates of the hydrograph flow from a catchment area of 770 km2 due to a 6-hr rainfall. a. Derive the ordinates of the 6-hr unit hydrograph. Assume that the graph of the baseflow is linear with respect to time. b. Plot the direct runoff hydrograph. c. Determine the rainfall excess in terms of (i) volume in m3 and (2) depth in cm. d. Plot the unit hydrograph. Time from the beginning of the storm (hr) 0 6 12 18 24 30 36 42 48 54 60 66 72 Discharge (cumecs) 40 65 215 360 400 350 270 205 145 100 70 50 42
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.
Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec.
Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec. (Answer 20 cu ft/sec)
Provide the correct answer .
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Q1. Based on 14 days runoff data given in TABLE Q1, determine the unit hydrograph for the catchment if the area is 4500 km2. Separate the baseflow by using appropriate method. TABLE Q1 Runoff Hydrograph Time (days) Runof(m's Time (days) Runoff(m's 1 II 2 10 4 4 2 15 12 2 6 18 13 7 16 14
Answer question 2