b) A 4-hour rain of an amount of 1 cm (i.e intensity of 1/4 cm/hr) falls over a catchment shown in Figure 1.1. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours, respectively, to the site 0 where the discharge measurements are made. i. ji. iii. Isochrones Catchment area IV (1) M4 50 ha 40 ha 30 ha 20 ha Basin boundary Discharge Figure 1.1 Determine the flow hydrograph at site 0 using the time-area curve method for this 4-hr rain with an intensity distribution given by: Time (hr) 1 2 3 Rainfall intensity 1/4 1/4 1/4 (cm/hr) Verify that the resulting flow hydrograph represents a unit hydrograph of 4-hr rain in the catchment Use this unit hydrograph to obtain flow hydrograph in the catchment for the following net rainfall profile Time (hr) Net rainfall (cm) 0-4 4-8 2 4 4 1/4
b) A 4-hour rain of an amount of 1 cm (i.e intensity of 1/4 cm/hr) falls over a catchment shown in Figure 1.1. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours, respectively, to the site 0 where the discharge measurements are made. i. ji. iii. Isochrones Catchment area IV (1) M4 50 ha 40 ha 30 ha 20 ha Basin boundary Discharge Figure 1.1 Determine the flow hydrograph at site 0 using the time-area curve method for this 4-hr rain with an intensity distribution given by: Time (hr) 1 2 3 Rainfall intensity 1/4 1/4 1/4 (cm/hr) Verify that the resulting flow hydrograph represents a unit hydrograph of 4-hr rain in the catchment Use this unit hydrograph to obtain flow hydrograph in the catchment for the following net rainfall profile Time (hr) Net rainfall (cm) 0-4 4-8 2 4 4 1/4
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:b) A 4-hour rain of an amount of 1 cm (i.e intensity of 1/4 cm/hr) falls over a
catchment shown in Figure 1.1. The time of concentration from the lines AA,
BB, CC and DD are 1, 2, 3 and 4 hours, respectively, to the site 0 where
the discharge measurements are made.
i.
ji.
iii.
Isochrones
Catchment
area
IV
(1)
M4
50 ha
40 ha
30 ha
20 ha
Basin
boundary
Discharge
Figure 1.1
Determine the flow hydrograph at site 0 using the time-area
curve method for this 4-hr rain with an intensity distribution
given by:
Time (hr)
1 2 3
Rainfall intensity 1/4 1/4 1/4
(cm/hr)
Verify that the resulting flow hydrograph represents a unit
hydrograph of 4-hr rain in the catchment
Use this unit hydrograph to obtain flow hydrograph in the
catchment for the following net rainfall profile
Time (hr)
Net rainfall (cm)
0-4 4-8
2 4
4
1/4
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