1. A planned subdivision near Tallahassee can be represented conceptually as shown below. 3,000 ft 5,000 ft Outflow The inner rectangle represents DCIA, consisting of rooftops, streets, sidewalks, driveways, and so on. The dimensions of the inner rectangle are 1000 ft wide by 2500 ft tall. The pervious area behaves like "lawns, sandy soil, average slope." The DCIA has characteristics of streets and roofs. "High-end" values of runoff coefficients should be used. The inlet time for flow from the far upper end of the catchment (e.g., an upper corner of the pervious area) is 2 hr. The inlet time just for the DCIA is 20 min. Rainfall intensity (in./hr) a. What is the 25-yr outflow, by the rational method? Remember to compute runoff both for the total area and for just the DCIA. 15 8 pervious 1.0 0.9 0.8 0.7 0.6 0.5 0.4 imp 0.3 ZONE 2 0.2 8 10 15 20 30 40 50 60 (min) 2 Duration 345 (hr) 2 yr 3 yr 5 vr 10 yr 25 yr 50 yr 100 yr 10 15 20 24 15 10 5 4 3 2 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 b. A corrugated metal pipe culvert (n=0.024) will receive the 25-yr flow from the catchment. Using the rational method solution from part a, if the pipe slope is 1%, what standard U.S. diameter should be used? Note: Standard diameters in the US start at 12 in. and increase in 6-in. increments to 60 in., then continue to increase in 12-in. increments.
1. A planned subdivision near Tallahassee can be represented conceptually as shown below. 3,000 ft 5,000 ft Outflow The inner rectangle represents DCIA, consisting of rooftops, streets, sidewalks, driveways, and so on. The dimensions of the inner rectangle are 1000 ft wide by 2500 ft tall. The pervious area behaves like "lawns, sandy soil, average slope." The DCIA has characteristics of streets and roofs. "High-end" values of runoff coefficients should be used. The inlet time for flow from the far upper end of the catchment (e.g., an upper corner of the pervious area) is 2 hr. The inlet time just for the DCIA is 20 min. Rainfall intensity (in./hr) a. What is the 25-yr outflow, by the rational method? Remember to compute runoff both for the total area and for just the DCIA. 15 8 pervious 1.0 0.9 0.8 0.7 0.6 0.5 0.4 imp 0.3 ZONE 2 0.2 8 10 15 20 30 40 50 60 (min) 2 Duration 345 (hr) 2 yr 3 yr 5 vr 10 yr 25 yr 50 yr 100 yr 10 15 20 24 15 10 5 4 3 2 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 b. A corrugated metal pipe culvert (n=0.024) will receive the 25-yr flow from the catchment. Using the rational method solution from part a, if the pipe slope is 1%, what standard U.S. diameter should be used? Note: Standard diameters in the US start at 12 in. and increase in 6-in. increments to 60 in., then continue to increase in 12-in. increments.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Subject Water Resources
Transcribed Image Text:1. A planned subdivision near Tallahassee can be represented conceptually as shown below.
3,000 ft
5,000 ft
Outflow
The inner rectangle represents DCIA, consisting of rooftops, streets, sidewalks, driveways, and so on.
The dimensions of the inner rectangle are 1000 ft wide by 2500 ft tall. The pervious area behaves like
"lawns, sandy soil, average slope." The DCIA has characteristics of streets and roofs. "High-end"
values of runoff coefficients should be used. The inlet time for flow from the far upper end of the
catchment (e.g., an upper corner of the pervious area) is 2 hr. The inlet time just for the DCIA is 20 min.
Rainfall intensity (in./hr)
a. What is the 25-yr outflow, by the rational method? Remember to compute runoff both for the total
area and for just the DCIA.
15
10
9
8
6
4
2
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
pervious
0.2
imp
8 10
ZONE 2
15 20
(min)
30 40 50 60
2
Duration
345
(hr)
2 yr
3 yr
5 yr
10 yr
25 yr
50 yr
100 yr
10
5
15 20 24
15
10
8
7
6
5
4
3
2
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
b. A corrugated metal pipe culvert (n=0.024) will receive the 25-yr flow from the catchment. Using the
rational method solution from part a, if the pipe slope is 1%, what standard U.S. diameter should be
used? Note: Standard diameters in the US start at 12 in. and increase in 6-in. increments to 60 in., then
continue to increase in 12-in. increments.
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