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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You 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?
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- Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec. (Answer 20 cu ft/sec)arrow_forwardGiven the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec.arrow_forwardAn urban park has a drainage basin area of 398 ac. The 25-year rainfall event has a precipitation intensity of 2.382 in./h. If the C factor is 0.75, what is the maximum rate that overland flow will drain from the urban park?arrow_forward
- PROBLEM #3 ONLY!!! Problem 1: A storm drain system is shown in Figure P16.11. For the flow conditions indicated, determine the time of concentration from Point A to Point C using the Kirpich, Kerby, Bransby-Williams, and Federal Aviation Administration Methods. Problem 2: Using the Kirpich time of concentration you calculated in Problem 1 and assuming the watershed is located in Seattle, WA, determine the intensity for the 50-year storm. Problem 3: For the watershed in Problems 1 and 2, determine the peak flowrate(in ft3/s )for the 50-year storm event at Point Cusing the Rational Method.arrow_forwardA catchment area has a time of concentration of 20 minutes, an area of 20 has. and a runoff coefficient of 0.25. Estimate the peak discharge corresponding to a 25-year period if the intensity-duration-frequency for the storm in the area can be expressed byarrow_forwardOne hour triangular unit hydrograph of a watershed has the peak discharge of 60 m^3/sec. cm at 10 hours and time base of 30 hours. The index is 0.40 cm per hour and base flow is 15 m^3/sec. (i) Compute the catchment area of the watershed in km^2. (ii) Compute the ordinate of the flood hydrograph at 15th hour, If the rainfall is 5.4 cm. in 1 hour.arrow_forward
- The flow rates measured during a precipitation at the outlet of a basin with an area of 32400 hectares are given below. It is assumed that the precipitation intensity is constant 60 mm/hr and the infiltration index of the basin is 10 mm/hr. Determine the duration of the unit hydrograph and obtain the 60-minute unit hydrograph of the basin. You can take the base flow as 100 m³/s.arrow_forwardA 0.10 mi2 parking lot has a runoff coefficient of 0.8 and a time of concentration of 40 minutes. For the following three rainstorms, determine the peak discharge (in ft3/s) using the Rational Method. a. 4.0 in/hr for 10 minutes b. 1.0 in/hr for 40 minutes c. 0.5 in/hr for 60 minutesarrow_forwardUse TR-55 graphical method to compute the peak discharge for a 250-ac watershed, with 25-y 24-h rainfall P = 6 in., time of comecntration tc = 1.53 h, runoff curve number CN = 75, and type II rainfallarrow_forward
- Determine the peak flow rate for a return period of 30 years if the average run off coefficient for the watershed is 0.30.arrow_forwardAfter a 2-hour storm, a station downstream from a 40 square mile drainage basin measures 9300 cfs as a peak discharge and 3400 acre-feet as total runoff. Find the 2-hour unit hydrograph peak discharge.arrow_forwardA catchment area is undergoing a prolonged rainless period. The discharge of the stream draining it is 4100 m3/min after ten days without rain, and 1200 m3/min after one month without rain. Find:a. The equation of depletion curve.b. Estimate the discharge after a period of four months, and a period of six months without rain.c. Draw depletion curve to scalearrow_forward
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