IN A WATERSHED, FOUR RAIN GAUGES I, II, II AND IV ARE INSTALLED. THE DEPTHS OF NORMÅL ANNUAL RAINFALL AT THESE STATIONS ARE 60, 75, 80 AND 100 CM RESPECTIVELY. THE RAIN GAUGE AT STATION III WENT OUT OF ORDER DURING A PARTICULAR YEAR. THE ANNUAL RAINFALL FOR THAT YEAR, RECORDED AT THE REMAINING THREE STATIONS WAS 90, 60 AND 70 CM. THE RAINFALL AT STATION III CAN BE CONSIDERED AS

IN A WATERSHED, FOUR RAIN GAUGES I, II, II AND IV ARE INSTALLED. THE DEPTHS OF NORMÅL ANNUAL RAINFALL AT THESE STATIONS ARE 60, 75, 80 AND 100 CM RESPECTIVELY. THE RAIN GAUGE AT STATION III WENT OUT OF ORDER DURING A PARTICULAR YEAR. THE ANNUAL RAINFALL FOR THAT YEAR, RECORDED AT THE REMAINING THREE STATIONS WAS 90, 60 AND 70 CM. THE RAINFALL AT STATION III CAN BE CONSIDERED AS

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 rainfall hyetograph shows a) the total volume of rainfall for a storm event; b) the cumulative volume of rainfall with time over the duration of a storm event; c) the variation of rainfall event over a watershed; d) the intensity of volume of rainfall as a function of time; e) none of the above
Recorded annual maximum 24-hour rainfall magnitudes at stations KTX are as under : YEAR RAINFALL (cm) 1960 12.0 1961 6.0 1962 4.8 1963 7.9 1964 12.0 1965 14.2 1966 13.6 1967 6.0 1968 3.7 1969 2.9 What is the return period, in years, for a 6.0 cm annual rainfall according to (i) Hazen formula; and (ii) Weibull formula respectively?
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)
i) Based on the unit hydrograph in Table Q4b, construct its S-Curve and develop a 1-hour Unit hydrograph. ii) Based on the unit hydrograph in Table Q4b, construct a new natural hydrograph that can be produced by a series of effective rainfall of 2.5cm, 1.1cm, and 0.3cm that occurred at one-hour intervals between one event and another.
The following rainfall data in 5-minute intervals were recorded for a storm: Time (min): Depth (in) 5 :0.07 10 :0.20 15: 0.25 20: 0.22 25 :0.21 30: 0.16 35 :0.12 40 :0.03 a) plot the rainfall hyetograph as intensity (in/hr) versus time (min) b) calculate the maximum depth (in.) and intensity (in/hr) recorded in 5, 10, 20 and 30 minutes
Determine average rainfall using Arithmetic mean method
During a storm event in a certain period, the rainfall intensity is 4.5 cm/hour and the - index is 2.5 cm/hour. The intensity of effective rainfall (in cm/hour up to one decimal place) for this period is