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I have five quations i need someone answer it these questions for water resourse subject . Is there someone can you solve it ?

1. A developer purchased a 120 acre land in a sub-urban of Akron, Ohio. The land was
originally a range under a poor condition. The city zoning map shows a medium to low
intensity residential zone for the division. He plans to build 220 single-family houses in
this new sub-division. The new road will need 8 acres. The land management code also
requires a forest preserve area for 20 percent of the total development area. What is the
average size of each lot? What are the peak runoff flow rates before and after the
development if the design storm is 25-year, 24-hour rainfall? The site center is located at
the geographic coordinate 40.XY50°N, 82.359°W. NOAA Atlas 14 rainfall data is
required for the design (https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html).
(Note: XY=last 2 digits of your Student ID number).
2. For the drainage system as shown in figure below, determine the design flow and
determine the pipe size for each of the sewer section by rational method. The
rainfall intensity (in/hr) is given by the IDF curve in second figure. The design
frequency storm is 10-year storm. Flow from each area is shown by an arrow.
The flow velocity in each pipe can be calculated by Manning’s equation or
Hazen-William equation by assuming a full pipe condition for peak flows. Assume
that the pipe material is concrete. Verify all the pipe flow velocities and time of
concentration at the end of calculation.
X=last-digit of your
Student ID
Unit Area(ac) Runoff Coefficient, C Overland flow time (min)
A 0.5
0.60+0.0X
5
B 0.9
0.65+0.0X
11
C 0.9
0.75+0.0X
10
D 1.4
0.70+0.0X
E 1.4
0.80+0.0X
14
F 1.0
0.70+0.0X
11
G 0.7
0.65+0.0X
8
Н
0.4
0.75+0.0X
6
12
Pipe Lengths Feet Slope
1-2
500 0.004
2-3
480 0.0075
3-5 600 0.0075
4-5 1100 0.0065
6-7
600 0.0055
7-8
400 0.0036
8-5
600 0.0075
5-9
700 0.008
А
B
с
3
1
E
4
5
9
F
G
H
6
7
8
Rainfall Intensity Duration Frequency Graph
3.50
3.00
2.50
1 Year Return Period
Average Intensity (in/hr)
5 Year Return Period
2.00
10 Year Return Period
25 Year Return Period
50 Year Return Period
1.50
– 100 Year Return Period
1.00
0.50
0.00
0
15 30 45
60 75
90
105
120
135
150
165
180
195 210
225
240
Storm Duration (minutes)
3. The Village of Aurora was never flooded before the Year 2016. Ever since a new
development in the neighboring city, the area started to experience the flood in
2017. An investigation was launched and found that the new development was
the cause of the flood for the downstream area including the Aurora Village.
What measures can be applied to mitigate the flood for the downstream area?
4. The runoff flow rate for a watershed is shown in the following table. A detention
pond is built at the outlet of the watershed to reduce the peak flow. If the outlet
has a maximum outflow capacity of 25 ft/sec, what is the minimum required
storage volume for the detention pond?
Runoff Flow
Rate (ft/sec)
Pond outflow
rate (cfs)
Cumulated
Required
Storage
Volume (ft)
Time from
beginning of
runoff flood
(hours)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
5.5
16
20
28
37
48
62
79
89
71
62
55
47
32
20
14
10
6
4
1
0
5. For a storm sewer design project, it is known that the maximum flow rate for the
design storm is XYZ cfs. The circular concrete pipe is selected for the design.
The slope of the pipeline is 1.1%. What size of the commercial pipe should be
used in English unit? (Note: XYZ=last 3-digit of your Student ID Number. If
XYZ

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