Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 16, Problem 12P
To determine
The peak discharge using
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As a field engineer you are tasked to
estimate the 25-year peak discharge for
concrete parking lot that is 310 feet
wide by 600 feet long using Rational
formula. The longest flow path is 310
feet of sheet flow across the lot on a
slope of 0.005 and 600 feet of shallow
concentrated flow along the parking lot's
length in a paved channel on a slope of
0.015. Use SCS procedures to determine
the time of concentration using a 2-year,
24-hr rainfall of 2.4 inches. Use Figure
below for the rainfall intensity in the
rational equation.
Intensity (in/hr)
0
10 20
25-yr average frequency
10-yr average frequency
30
40
-5-yr average frequency
2-yr average frequency
50 60 70 80 90 100 110 120
Duration (min)
2. A manufacturing plant is discharging wastewater into a stream at a constant rate of 2.0 m/sec. The
concentration of a contaminant in the wastewater is given as 50 ppm. The average stream flow
upstream of the discharge point is 6.0 m³/sec, and an upstream contaminant concentration of 4 ppm.
The average depth of the stream is given as 1.5 m and the average width is given as 25 m. The
contaminant is removed by a first-order reaction with a rate coefficient of 0.35 /day. Assume the
stream behaves as a plug-flow system.
a. Draw a diagram and write the appropriate (starting) mass balance equation(s).}
See pdf
O Not sure how to proceed
b. Calculate the concentration of the contaminant in the stream at the discharge point and at 25
km downstream.
At the dischrage point:
mg/L
25 km downstream:
mg/L
A municipal wastewater treatment plant (WWTP) receives a flow of 5.0 MGD. The WWTP
does not have an equalization basin and therefore can have a peak hour flow that is 2.5 times
the average daily flow. The WWTP has two circular, upflow clarifiers operating in parallel.
The clarifiers must be designed to meet the following conditions:
1,000 gpd/ft (maximum)
Average overflow rate =
Peak overflow rate = 2,500 gpd/ft° (maximum)
Basin depth = 10 ft
What is the diameter of each primary clarifier? Hint: calculate the diameter for each
a.
of the given conditions, and select your diameter based on your results.
Chapter 16 Solutions
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- A storm of 0.5 in/hr falls on a watershed with three time area blocks: (A: Area =100 ac, time to gage 1 hr, B: Area = 200 ac, time to gage = 2 hours, and C: Area - 300, and time to gage = 3 hours), Determine the discharge at the end of the third hour using the time area method: O a. None of the above O b. 200 cfs O c. 300 cfs Od. 100 cfsarrow_forwardLABORATORY OPEN CHANNEL FLOW QUESTIONS: What happens to the value of the head loss if the discharge through the titling flume channel is increased?arrow_forwardYou are responsible for calculating the peak discharge for a culvert design in a smallwatershed in Washington, DC. The watershed area is 4 acres and currently has 30 % of its area ofindustrial (heavy areas) and 70 % of residential (single –family areas). The design manual suggestsyou design your culvert for a 10 return period. The watershed has a concentration time of2 hours. Calculate:a) What is the design peak flow?b) What is the impact of the runoff coefficient (C) range on your design?c) After you implemented your project, the residential area was entirely converted toindustrial areas. Would that affect you design? If yes, by how much?arrow_forward
- 5.(c) A circular sewer is to be designed to carry maximum flow of sewage while flowing 70% full at a velocity of 1m/sec. If the ratio of maximum/average flow is 3 and average/minimum is also 3, find (i) Full flow velocity (ii) Velocities generated, both at the average flow as well as minimum flow. Neglect the variation of N with depth of flow and take q V Q V 0.337 0.902 0.196 0.776 0.088 0.615arrow_forwardFor the given rainfall data, compute the runoff volume if the index is 0.9 in/hr. The watershed area is 0.785 mi². t(hr) 0-3 3-5 5-8 8-11 11-12 i(in/hr) 1.20 2.10 1.30 1.00 0.80arrow_forwardGiven the following tabulate data for wastewater discharge permit review, find the minimum downstream DO that could be expected parameter Flow (m/s) Ultimate BOD (mg/L) DO (mg/L) ka (day1) kr (day1) speed (m/s) DOs (mg/L) wastewater river 0.25 0.75 7.0 4.5 1.2 6.2 0.22 0.35 0.65 7.7 7.7arrow_forward
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