Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 16, Problem 10P
To determine
The depth of runoff for
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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.
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.
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- A 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_forward. (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_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
- (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_forwardProblem 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_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 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_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_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_forwardA 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The watershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (use the IDF below) 20.0 15.0 10.0 8.0 RAINFALL INTENSITY IN INCHES PER HOUR 6.0 4.0 6 0.1 0.08 0.06 0.04 0.02 5 VDOT B, D & E eqn. except for 1-year NOAA Atlas 14 Vienna/Tysons for 1-year 10 15 20 MINUTES SHINE RETURN PERIOD (YEARS) 30 40 50 60 N 10 DURATION NOAA Atlas 14 Vienna/Tysons 2 3 4 5 6 HOURS 8 10 12 سلسلي 18 24arrow_forwardQ2) A watershed has the following land use: a- 300 ha of open forest land b- 500 ha of good pasture land c- 200 ha of poor bunded cultivated land The soil is of hydrologic soil group A of 30% and 70% of group C. Estimate the runoff volume for the watershed under an antecedent moisture category III when two days of consecutive rainfall of 0.5 m and 0.7 m occur.arrow_forward
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