5. Simple triangular one-hour unit hydrographs of three different catchments [A, B and C] have been fit to data and are shown below. UH B 20 m/s UH A 15 m'is hr 6 hr 3 hr 8 hr 40 m/s – UH C 4 hr 12 hr
5. Simple triangular one-hour unit hydrographs of three different catchments [A, B and C] have been fit to data and are shown below. UH B 20 m/s UH A 15 m'is hr 6 hr 3 hr 8 hr 40 m/s – UH C 4 hr 12 hr
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![5. Simple triangular one-hour unit hydrographs of three different catchments [A, B and C] have been
fit to data and are shown below.
UH B
20 m'/s
UH A
15 m'ls
2 hr
6 hr
8 hr
3 hr
40 m'/s -
UH C
4 hr
12 hr
(a) What is the area of each catchment?
(b) Catchments A and B are similar, except that one contains a town. Which is more likely to contain
a town and why
(C) Net rainfall of 15 mm in the first hour, 25 mm in the second hour and 15 mm in the third hour
falls on catchment A. Calculate the resulting run-off as a function of time.
(d) Net rainfall of 15 mm in the first hour, 25 mm in the second hour and 15 mm in the third hour
falls on catchment B. Calculate the resulting runoff as a function of time.
(e) The rivers flowing out from catchments A and B meet shortly after they leave the catchments. A
storm with the net rainfall given above moves across the two catchments, with the rainfall starting
an hour later on catchment B than catchment A. Calculate the resulting combined run-off as a
function of time.
(f) The simple triangular 1-hr unit Hydrograph 'UH A' from above was actually generated using the
data below. Use the data to generate a 3hr hydrograph. Plot your hydrograph and fit a simple
triangular UH to it. What's the peak flow of your 3-hr UH? And the time to peak flow? Check that
that volume implied by your UH is appropriate.
Time (hr)
1
2
4
5
6
Flow (m3/s)
20.25
9.5
15.5
4
0.25](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F96b2aa33-eebe-48ff-8829-6ebc8242493f%2Fa723dec2-c097-4a1b-85bb-9ec8803d398b%2Fms9um93_processed.png&w=3840&q=75)
Transcribed Image Text:5. Simple triangular one-hour unit hydrographs of three different catchments [A, B and C] have been
fit to data and are shown below.
UH B
20 m'/s
UH A
15 m'ls
2 hr
6 hr
8 hr
3 hr
40 m'/s -
UH C
4 hr
12 hr
(a) What is the area of each catchment?
(b) Catchments A and B are similar, except that one contains a town. Which is more likely to contain
a town and why
(C) Net rainfall of 15 mm in the first hour, 25 mm in the second hour and 15 mm in the third hour
falls on catchment A. Calculate the resulting run-off as a function of time.
(d) Net rainfall of 15 mm in the first hour, 25 mm in the second hour and 15 mm in the third hour
falls on catchment B. Calculate the resulting runoff as a function of time.
(e) The rivers flowing out from catchments A and B meet shortly after they leave the catchments. A
storm with the net rainfall given above moves across the two catchments, with the rainfall starting
an hour later on catchment B than catchment A. Calculate the resulting combined run-off as a
function of time.
(f) The simple triangular 1-hr unit Hydrograph 'UH A' from above was actually generated using the
data below. Use the data to generate a 3hr hydrograph. Plot your hydrograph and fit a simple
triangular UH to it. What's the peak flow of your 3-hr UH? And the time to peak flow? Check that
that volume implied by your UH is appropriate.
Time (hr)
1
2
4
5
6
Flow (m3/s)
20.25
9.5
15.5
4
0.25
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