The intensity of the rain and time interval of a typical storm areRainfall intensity(mm/minutes)Time interval(minutes)0-100.710-201.120-302.230-401.540-501.250-601.360-700.970-800.4The maximum intensity of rainfall for 20 minutes duration of the storm ismm/min

The intensity of the rain and time interval of a typical storm are Time interval (minutes) Rainfall intensity (mm/minutes) 0-10 0.7 10-20 1.1 20-30 2.2 30-40 1.5 40-50 1.2 50-60 1.3 60-70 0.9 70-80 0.4 The maximum intensity of rainfall for 20 minutes duration of the sto

The intensity of the rain and time interval of a typical storm are Time interval (minutes) Rainfall intensity (mm/minutes) 0-10 0.7 10-20 1.1 20-30 2.2 30-40 1.5 40-50 1.2 50-60 1.3 60-70 0.9 70-80 0.4 The maximum intensity of rainfall for 20 minutes duration of the sto

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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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

The intensity of the rain and time interval of a typical storm are
Rainfall intensity
(mm/minutes)
Time interval
(minutes)
0-10
0.7
10-20
1.1
20-30
2.2
30-40
1.5
40-50
1.2
50-60
1.3
60-70
0.9
70-80
0.4
The maximum intensity of rainfall for 20 minutes duration of the storm is
mm/min

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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
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.
The isolation map of a 10-hour downpour in a basin is given in the figure on the right.a) Find the mean areal precipitation height for this downpour.b) Calculate and plot the 10-hour precipitation height-area curve.
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