3. 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
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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.Problem 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.An 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 55
- A 300 acre watershed just south of Chicago is currently undeveloped (woods). The soils are primarily clay, the hydraulic length of the watershed is 6560 ft, and the average lank slope is 1%. Determine the SCS synthetic UH before development and finish the table below. Solution: from Table 11.7; 1. For clay soil with woods cover, CN= 2. The soil moisture deficit S = in; 3. For a watershed with hydraulic length, time of concentration Te= hr min; 4. Time to peak Tp= min: 5. Peak discharge Op= cfsjin; 6. Storm duration is AD= hr= min; 7. The -min UH is displayed below using Table 11.11; Flow Time Time Ratios Flow Ratios (min) (cfs) (t/tp) (9/ap) 21 13 0.1 0.2 40 42 0.31 0.4 0.66 0.6 0,93 0.8 125 121 0.93 1.2 102 146 1.4 0.78 167 73 0.56 1.6 51 188 0.39 1.8A 400 ha watershed has predominantly black cotton soil and its CN value is estimated as 73. Estimate the runoff volume due to two consecutive days of rainfall as follows: Day Rainfall (mm) Day 2 80 Day 1 65 The AMC can be assumed to be Type III.A catchment has four sub-areas. The annual precipitation and evaporation from each of the sub-areas are given below. Assume that there is no change in the groundwater storage on an annual basis. Compute the runoff coefficient for the Sub A. Show complete Solution
- 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?(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.]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.
- . (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.Problem 3. A 50-ha catchment has the following time-area relationship. Estimate the runoff hydrograph (cumecs) using the time-area method for a 30-min rainfall hyetograph given. Time (min) Contributing area (ha) 10 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 8. 10-15 15-20 4 20-25 25-30 1A local municipality is tasked with managing the sediment from its three streams originating from three different catchments. The sediment generated for each catchment is shown below as well as the annual stream runoff for each catchment. The municipality would like to install a sedimentation pond downstream of all three catchmentsthat requires cleaning every three months. Assuming that all the sediment settles in the pond, determine the size of the pond (in m3) making provision for an additional 10% of sediment in the event of flooding. The density of the sediment is 1.2 tons/m3