6.4. The direct runoff hydrograph resulting from a 5cm of effective rainfall of 6hr duration is given below. Determine the area of the catchment and the ordinates of the 6hr UH. Time (hr) 0 12 18 24 30 36 42 48 54 60 66 72 Direct runoff 0 25 175 320 360 310 230 165 105 60 30 10 0 (m³/s) Ans. Area of the catchment=773.28km² The ordinates of 6hr UH at 6hr intervals are (0,5,35,64,72,62,46,33.21,12,6,2,0) CE TH 20 175 05 2 and 0

6.4. The direct runoff hydrograph resulting from a 5cm of effective rainfall of 6hr duration is given below. Determine the area of the catchment and the ordinates of the 6hr UH. Time (hr) 0 12 18 24 30 36 42 48 54 60 66 72 Direct runoff 0 25 175 320 360 310 230 165 105 60 30 10 0 (m³/s) Ans. Area of the catchment=773.28km² The ordinates of 6hr UH at 6hr intervals are (0,5,35,64,72,62,46,33.21,12,6,2,0) CE TH 20 175 05 2 and 0

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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Q2: A lake with a surface area of 5km² had a water surface elevation of 103.2m above datum at the beginning of a certain month. In that month the lake received an average inflow of 6m³/s from surface runoff source. In the same period the outflow from the lake had an average value of 6.5 m³/s. Further, in that month, the lake received a rainfall of 145mm and the evaporation from the lake surface was estimated as 6.10cm. Calculate the water surface elvation of the lake at the end of the month.
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
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Recorded flow data from a 7 sq. km. catchment due to a 1 hour rainfall event is given in Table 2. The base flow is 0.14 m³/s. Assume that the uniform rainfall over the catchment area was 39 mm. If the o-index of the catchment area is 21 mm/hr, calculate the ordinates of 1 hour unit hydrograph in Table 2. Table 2: Data for Question 2(b) (Draw the Table on a Page and Solve the Problem) Time Flow (hr) (m³/s) 0.5 1 3.0 2 7.5 3 6.0 4 4.5 5 3.0 2.1 7 1.5 8 1.1 9 0.8 10 0.5 11 0.2
2-A 3 hours storm produces a flood hydrograph as: t (hr) Q (m³/s) 0 3 4 9 6 12 9 18 12 15 18 21 24 27 20 16 20 10 8 6 Determine 3 hr-UH, if the catchment area is 50 km². 3- Find the flood hydrograph of 3 hrs storm (use the UH of Q2). Total precipitation is 14.5 cm and 9-index is 1cm/hr. 30 4
A catchment has the Horton infiltration parameters: fo= 150 mm/h, fc = 50 mm/h, and k = 3 min¹. The design storm is given below. Estimate the time when ponding begins. Interval (min) Average rainfall (mm/hr) 20 40 80 170 90 20 0-10 10-20 20-30 30-40 40-50 50-60
Compute the diameter (cm) of the outfall required to drain storm water from the watershed described in figure below. Use rainfall intensity = 4 cm/hr. Average velocity of flow is 1 m/s. Other data are for: Area 1: C=0.5, area=0.005 km2. Area 2: C=0.4, area =0.01 km2. Area 3: C=0.7, area=0.015 km2.
Example Problem Water budget for a lake provides following observations: Precipitation, P = = 43 in./yr. Evaporation, E = 53 in./yr. Inflow to Lake, Qin = 1 in./yr. Outflow from Lake, Qout = 173 in./yr. Change in Lake storage, AS = -2 in./yr. Find the net groundwater flow. Solution: E SWIn GWin PPT Evap SW Out GWout
a. What is the inflow? b. What is the outflow?
In reference to the Table below: Day 1 2 3 4 6 7 Rainfall, mm 11 8 13 9 11 Water added, -5 -3 0 0 7 4 3 mm Determine the water lost from the lake in ha-m, if the pan coefficient is 0.7 and the area of the lake is 430 ha. 19.0 None of the choices 16.5 23.4 23.8
A reservoir had a water surface elevation of 110 m above the datum at the beginning of the month. In the same month, the reservoir received an average inflow of 7.5 cms (m3/s) from surface runoff sources. For the same period, the outflow from the reservoir had an average value of 5 cms. Further, in the same month, the reservoir received a rainfall of 180 mm and losses due to evaporation of 5 cm. Assume the area of the lake is 50 km2 acres and assume no contribution from groundwater storage. What is the water surface elevation of the reservoir after the month?