(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.
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- (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.]Assume the AMC at Day 1 to be of Type III. Use standard SCS-CN equations. (6) A watershed has the following land use: (a) 400 ha of row crop with poor hydrologic condition and (b) 100 ha of good pasture land The soil is of hydrologic soil group B. Estimate the runoff volume for the watershed under antecedent moisture category III when 2 days of consecutive rainfall of 100 mm and 90 mm occur. Use standard SCS-CN equations.A 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 24
- A 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.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 %3DWhat would the runoff be if a 3 acre watershed got 10 in/hr rainfall and an average c coefficient of 0.4?
- Initial abstraction la a) The area contributing direct run off to a stream b)The degree of vetness of vetness of a watershed at the begining of a storm c)A graph showing, for given point on a stream or for a giving point in any drainage system, the discharge, stage, velocity or other of waterwith respect to time. d)The water that enters the stream chanels during a storm or soon after, forming a runoff hydrograph. may consist of rainfall on the stream surface, surface runoff, and seepage of infiltrated water. e)When considering surface runoff, is all rainfall before runoff begin. when considering direct runoff, consists of interception, evaporation, and the soil-water storage that must be exhausted be exhausted before direct f)branch of engineering science dealing primarily with the flow of water or other liquids. Antecedent Moiture Condition (AMC) a) The area contributing direct run off to a stream b)The degree of vetness of vetness of a watershed at the begining of a storm c)A graph…Read the question carefully and give me right solution according to the question. A watershed received 68 mm of rain on 1 day. It has open spaces with 60% grass cover and Group A soil. Previous to this event, the watershed had received 34 mm rainfall in the past 5 days. Compute the direct runoff by using the SCS method.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?
- Calculate 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 ]A 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) RAINFALL INTENSITY IN INCHES PER HOUR 20.0 15.0 10.0 8.0 6.0 4.0 0.8 X 0.2 0.1 0.08 0.06 0.04 0.02 II ப____ lud 6 VDOT B, D & E eqn. except for 1-year 10 NOAA Atlas 14 Vienna/Tysons for 1-year 15 20 MINUTES 30 RETURN 40 50 60 EN PERIOD (YEARS) 25 10 DURATION NOAA Atlas 14 Vienna/Tysons 2 3 4 5 6 HOURS 8 10 12 18 24 -The ordiantes of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5cm for the first six hours and 15cm for the second six hours, compute the direct runoff hydrograph ordiantes and plot the hydrograph. (List all the DRH ordiantes in order)