Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 16, Problem 10P
To determine
The depth of runoff for
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1.Determine the weighted curve numbers for a watershed with 40 percent residential (1/4-acre lots), 25 percent open space, good condition, 20 percent commercial business (85 percent impervious), and 15 percent industrial (72 percent impervious), with corresponding soil groups of C,D, C, and D. If the watershed experienced a rainfall of 6in, what is the runoff volume?
Using the TR-55 method, determine the depth of runoff, in inches, for a 24-hour, 100-year precipitation event of 9 inches if the soil can be classified as group B and the watershed is contoured pasture with good hydrologic condition and an antecedent soil condition III.
Compute the runoff from 5 inches of rainfall on a 1000-acre watershed. The hydrologic soil group is 50 percent Group B and 50 percent Group C interspersed throughout the watershed. Antecedent moisture condition II is assumed. The land use is given below followed by the reference table for Runoff CNs.
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- . (a) Compute the runoff from a 7-in rainfall on a 1500-acre watershed that has hydrologic soil groups that are 40 percent group A, 40 percent group B, and 20 percent group C interspersed throughout the watershed. The land use is 90 percent residential area that is 30 percent impervious, and 10 percent paved roads with curbs. Assume AMC II conditions. (b) What was the runoff for the same watershed and same rainfall before development occurred? The land use prior to development was pasture and range land in poor condition.arrow_forwardA 200-hectare watershed is slated for commercial and business development. Currently the watershed is open space (good condition) with 35% B-soils and 65% D- soils. a) Find the CN for the soil before and after development b) Find the weighted CN (include the equation and calculation, c) Determine the increase in runoff depth from a 10 cm rainfall event due to developing the watershed 3.arrow_forwardProblem 4.3. By rational method, determine the design peak runoff for a 50-year return period. The watershed consists of 50-ha (120-ac), one third in rotation meadow and the remainder on row crops on the contour. The hydrologic soil group is B and the time of concentration is 30 min. The watershed is at your present location.arrow_forward
- Problem 3.24 (page 119): The soil in a watershed has the following properties: 0, = 0.02, 0fe= 0.25, and 0 = 0.38. The watershed has a composite ARC II curve number of CN 80. A storm with a rainfall of 30 mm occurs in dormant season. During the five days before the storm begins, the total rainfall is 25 mm. Estimate the direct runoff from this storm using the MORE and SCS-CN models. %3D %3D %3Darrow_forward(a) Compute the runoff from a 2000 ha watershed due to 15 cm rainfall in a day. The watershed has 35% group B soil, 40% group C soil and 25% group D soil. The land use is 80% residential that is 65% impervious and 20% paved roads. Assume AMC II conditions. (7) (b) If the land were pasture land in poor condition prior to the development, what would have been the runoff volume under the same rainfall? What is the percentage increase in runoff volume due to urbanization? [Note: Use standard SCS-CN equations.]arrow_forwardAn 40-ha watershed was subjected to a 5- year rainfall with a depth of 122 mm with characteristics given below. Compute for the peak runoff of the watershed. Hydrologic Soil Group Land Use, Area Curve Treatment, and (ha) Number Condition Row crop, 24 82 contoured, good Woodland, good В 16 55arrow_forward
- Determine the area weighted curve number for a watershed with 60% Roads, hard-surface, and 20% Farmsteads and 20% Straight row small grain with poor hydrologic condition, with Corresponding soil groups of C, D, C, and AMC II. Calculate the effective rainfall P* in this Watershed during a 100 mm storm event.arrow_forwardA 400-acre watershed has the following characteristics: o 150 acres of forest with a Muskingum soil o 100 acres of forest with a Shelocta soil o 25 acres surface mined Muskingum soil o 50 acres surface mined Shelocta soil o 75 acres bottom land Pope soil Calculate the appropriate SCS curve number. Convert it to Antecedent conditions I and II. Estimate the 25-year peak runoff rate from the watershed of the previous problem assuming the AMC II condition. The watershed average slopes are 20 % and the maximum flow length is 1.0 miles. Assume the watershed is in Inez, Kentucky. Use the SCS Curve number method.arrow_forwardA 220-acre watershed is comprised of 2 distinct areas: 40% cultivated, flat land- tight day 50% cultivated, flat land-sandy loam. The time for concentration in this watershed has been found to be 90 minutes. Water flows to the center of the two drainage areas, not across both. Determine the runoff rate of this area for the 10-year storm?arrow_forward
- 5. Determine the weighted average runoff coefficient, C, and peak runoff rate for a 10-year storm of an 8-acre watershed with 6 acres of grassy ficld of sandy loam with a 6% slope and 2 acres of forest of clay & silt loam with a 22% slope in Manteo, NC? Assume a 10-minute time of concentration.arrow_forwardCalculate the runoff from a watershed of (0.01 x 4737) ha. The following data are available: Depth of rainfall is 100 mm. Antecedent rainfall condition, AMC 1: Row crop, good condition in 40 ha (Soil group C) Woodland, good condition in 20 ha (Soil group B) The day after the rainfall of 100 mm, another rainfall of 50 mm occurred. Solve for the surface runoff from the watershed. [ NOTE: Where R is the last four digits of your Registration Number. R = 4737 ]arrow_forwardDetermine the peak runoff (Nearest whole number) from a 100-year storm for the watershed described below: Field 1: 192 acres, 2% slope, cultivated, sandy soil Field 2: 38 acres, 8% slope, pasture, tight clay soil Field 3: 40 acres, 11% slope, woodland, silt soil The drainage way is 4000 feet with a 0.1% slope.arrow_forward
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Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning
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ISBN:9781305156241
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Publisher:Cengage Learning