ordinates of a hydrograph are given. 0 3 6 9 12 18 24 30 36 42 48 54 60 66 Time (h) 6-h UH ordi- nate (m/s) 0 150 250 450 600 800 700 600 450 320 200 100 50 0 A stom had three successive 6-h intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Assuming a øindex of 0.20 cm/h and a base flow of 30 m/s, determine and plot the resulting hydrograph of flow.

ordinates of a hydrograph are given. 0 3 6 9 12 18 24 30 36 42 48 54 60 66 Time (h) 6-h UH ordi- nate (m/s) 0 150 250 450 600 800 700 600 450 320 200 100 50 0 A stom had three successive 6-h intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Assuming a øindex of 0.20 cm/h and a base flow of 30 m/s, determine and plot the resulting hydrograph of flow.

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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Assuming an initial loss of 30 mm and continuing loss of 5 mm/h, what is the excess rainfall for the rainfall measurement given below Depth Time (mm) (hrs) of rainfall 1 2 3 4 5 6 7 5.86 13 13 3068 16.79 10.53 1.3. 59
q.1What is Unit Hydrograph? Discuss Unit Hydrograph method of estimating maximum Probable Discharge.
Q3/ Find the flood peak and its time that resulting from three respective storms each of ohrs duration and have depths of (7.2,14.4,10.8) inch respectively, the catchments of 5.04 mile has a constant base flow of 0.425 m³/sec and has the following 3hr unit hydrograph. Time(hr) 0 3 UH(ft/sec) 0 75 6 280 9 12 283 662 15 18 21 645 432 314 24 195 27 30 93 31
2) Construct a rainfall hyetograph (rainfall intensity, in mm/hr, versus time, in minutes) if the total rain in Question 1 above has the following temporal distribution (Table 1). Sketch the hyetograph. Table 1: Temporal Distribution Time (min) 0-5 5-10 10-15 15-20 20-25 25-30 % rainfall per period 12.5 12.5 38 13.5 13.5 10
Ql: (4 Points) Answer the following questions by True or False: 1. An increase in the relative humidity increases evaporation. 2. In general the storm duration increases the rainfall intensity decreases. 3. The double mass curve technique is adopted to check the intensity of rainfall data. 4. Interflow is the flow that reaches a stream from groundwater. ation
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) 6 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)
TT DILLU b. The ordinates of the recession limb of a hydrograph are listed below. Assuming that the interflow is negligible, determine the direct runoff and base flow recession constants. Time from Time from Peak Hours Discharge m³/s Discharge m³/s peak hours 0 517 72 134 12 432 84 113 24 318 96 96 36 227 108 72 48 188 120 60 60 153 132 50
Station Rainfall (mm) Annual (mm) ДХ (m) ΔΥ (m) Area (m²) A 42 500 10 25 1500 30 480 15 30 2000 50 558 24 30 830 526 500 E 35 590 40 19 1200 Using a rainfall of 386 mm for rain gauge Station D, determine the average depth of rainfall that fell for the watershed using the arithmetic average, and Thiessen polygon method. The areas for the Thiessen polygon method are given in the table above for each station. B.
Problem 2. A storm had 3 successive 6-hr intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Time from the beginning 0 3 6 9 12 18 24 30 36 48 54 60 66 42 of the storm (hr) 6-hr UH ordinates (cumecs) 0 150 250 450 600 800 700 600 450 320 200 100 50 0 a. Plot the resulting DRH due to 3 rainfall events, assuming a phi-index of 0.20 cm/hr. • Recall that the phi-index represents the rate of infiltration. • The hydrograph plots RUNOFF rates, where runoff = precipitation - losses. Note that the rainfall magnitude is reported as total rainfall depth in 6 hrs, so convert infiltration as a total for every 6 hr period. b. Assuming a baseflow of 30 m3/s, what are the ordinates of the storm hydrograph?
A storm produced rainfall depths of 3.5, 7.5, 5.5 cm on the drainage basin of area 104 km² in the three successive time period of 6 hr each. Assuming a base flow of 15 m³/s and -index of 0.25 cm/hr. Compute total run off hydrograph resulting from this storm? Time(hr) 0369 12 15 18 21 24 UH (m/s) 0 25 50 85 125 160 185 172.5 160 27 30 36 42 48 54 135 110 60 36 25 16