The rainfall intensity or each 30 minute period are given below for a storm. The basin area is 5 km2. The p index is 0.4 cm/hr. 30 minutes period Rainfall Intensity (cm/hr) Zoom image Determine the total storm rain. 56500 m3 55600 m3 57800 m3 52220 m3 Determine the volume of surface runoff. 18500 m3 22000 m3 1 1.0 25000 m3 24250 m3 2 0.06 3 0.6 4 0.6

The rainfall intensity or each 30 minute period are given below for a storm. The basin area is 5 km2. The p index is 0.4 cm/hr. 30 minutes period Rainfall Intensity (cm/hr) Zoom image Determine the total storm rain. 56500 m3 55600 m3 57800 m3 52220 m3 Determine the volume of surface runoff. 18500 m3 22000 m3 1 1.0 25000 m3 24250 m3 2 0.06 3 0.6 4 0.6

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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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)
Analysis of rainfall and runoff records for a certain storm over a basin (of area 3210 km²) gave the following data: Rainfall for successive 2 hr periods: 2.5, 6.5 and 4.5 cm/hr. Direct surface discharge at the concentration point for successive 2-hr periods: 400, 1200, 4500, 7700, 12000, 10220, 8260, 3900, 838 and 400 m’. Derive the unit hydrograph for the catchment area.
For a 14 hours storm, accumulated rainfall is given below. Time (hours) 02 4 6 8 10 12 14 Accumulated rainfall (cm)| 0 | 0.8 3.0 5.8 6.9 8.1 9.6 10.8 If $index for the catchment is 0.4 cm/h, then the intensity of effective rainfall at 8th hour will be cm/h.
Example4: Cumulative Rainfall depth 10 cm and cumulative runoff 5.8cm Find Ø - index if rainfall according following data : Time (hr.) 1 2 3 4 6 7 8. Rainfall intensity (cm.) 0.4 0.9 1.5 2.3 1.8 1.6 1 0.5
The incremental rainfall intensity data given in the table below were recorded at a gage located on a small urban watershed. Using a 0.5-hour time step: (a) Plot the rainfall Hyetograph. (b) Determine the total rainfall depth during the storm event. (c) If the runoff depth is 4.65 mm, find the phi- index in mm/ hr. Rainfall intensity data- Time (hr) 0- 0.5- 1.0- 1.5- 2.0- 2.5- 3.0- 3.5- 4.0- 4.5- 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Rainfall Intensity 2 2.5 5 1.5 1 0.5 (mm/hr)
For the following rainfall rate, find the net runoff in cm, total rainfall and the value of W-index. Take Ø-index = 3. Time (min) 10 20 30 40 50 60 70 Rain rate (cm/hr) 2.5 2.5 10 7.5 1.25 1.25 5
Show full solution.According to rainfall data collected by a laboratory during storm events, the precipitation level in inches (X) varies jointly with runoff in cubic feet per second (Y). The joint probability mass function (PMF) of both variables are given by the following Table: Y 1 2 3 10 0.05 0.15 0 20 0.1 0.25 0.25 30 0 0.1 0.1 a. Determine and plot the marginal PMF of runoff.b. Determine the correlation coefficient between X and Y.
1. A 160-acre drainage basin has the following characteristics: Land Use Residential, flat, 60% impervious Residential, flat, 30% impervious Concrete or sheet asphalt pavement Turf Meadows Forested Area * for a range of values, the runoff coefficient can be calculated as an average value. Rainfall Intensity (in/hr) Find the peak runoff from the drainage area for a 20-minute duration storm with a return frequency of 25-years? 20 18 16 14 2 0 0 Frequency (years) 100 50 25 10 10 Area % 20 30 5 25 20 20 30 Duration (min) Coefficient (C)* 0.55 0.40 0.85 0.25 0.2 40 50 60
shows The figure below (Figure 1-15 in the book) Intensity-Duration-Frequency (IDF) curves for Houston, Texas. What is the rainfall intensity (in./hr) for the storm with a 2 hr duration and return period of 10 years? Rainfall intensity (in./hr) 20.0 15.0 10.0 8.0 6.0 4.0 2.0 1.0 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 5 Houston, Texas, 1910-1951 Note: Frequency analysis by method of extreme values, - after Gumbel (1958) Period return (yr) 100- 10 15 20 30 40 60 (min) 2 Duration 3 4 5 6 8 10 12 18 24. (hr)
During a storm, the rates of rainfall observed at a frequency of 15 min for one hour are 12.5, 17.5, 22.5 abd 7.5 cm/h. If the phi-index is 7.5 cm/h, then the total run-off will be 1. 22.50 2. 15.00 3. 30.00 4. 7.50