1. Calculate the runoff coefficient for use in the Rational Method if a watershed consist of 5 acres Woodland (C=0.25) and 20 acres of cropland (C-0.60). a. 0.425 b. 0.85 C. 0.60 d. 0.53
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- A catchment is made of 60% area with runoff coefficient 0.40 and remaining 40% area with runoff coefficient 0.6O. What is the weighted runoff coefficient to be used in Rational formula? * 0.6 0.24 0.5 0.482) Assume the total runoff hydrograph was measured over 4 hours, in 30 minute intervals. The baseflow is 10 cfs and the watershed is 100 acres. Determine the 30 min unit hydrograph. Time (min) Runoff (cfs) 0 10 30 50 60 80 90 160 120 210 150 180 180 155 210 110 240 604. A 60 mi² drainage area has the following characteristics: longest flow path length of 10 mi, flow path length from outlet to centroid of 3.2 mi, overland slope of 0.05, curve number of 82, basin coefficient of 1.35, and storage coefficient of 0.6. a. Derive a 1-hr: i. Snyder UH ii. SCS triangular UH. b. Plot the resulting hydrographs (together on one plot) and comment on the differences in peak discharge, peak timing, hydrograph shape, and volume between the two.
- Question 5. The 30-min unit hydrograph for a 2.25km² urban catchment is given by Time 0 30 60 90 120 150 180 210 240 270 300 (min) Runoff 0 1.2 2.8 1.7 1.4 1.2 1.1 0.91 0.74 0.61 0.50 0.28 0.17 0 (m³/s) 330 360 390 a) verify that the unit hydrograph is consistent with a 1-cm rainfall excess; b) estimate the runoff hydrograph for a 30 min rainfall excess of 3.5 cm and c) estimate the runoff hydrograph for a 60-min rainfall excess of 7.0 cmCalculate the runoff depth in cubic meters for the 100 year storm event over a watershed using the SCS Runoff Method. The design rainfall for 10 year storm event is 115 mm and the drainage area is approximately 82.5 hectares. NOTE: Round off your weighted CN to the nearest WHOLE NUMBER. LAND USE 30% 25% 20% 25% HINT: Determine first the weighted CN by weighted CN CN to determine the runoff depth. = CURVE NUMBER 72 7 71 70 67 (%land use X CN) then use the weightedQ2 Q3 A small watershed consists of 2 km² of forest area (c = 0.1), 1.2 km² of cultivated area (c = 0.2) and 1 km² under grass cover (c = 0.35). A watercourse falls by 20 m in a length of 2 km. The IDF relation for the area may be taken as: I = Estimate the peak rate of runoff for a 25-year frequency. 807 0.2 -; I in cm/hr, T- yr, t in minutes. (t+12) ⁰.5 103 2-R-[IA+E]] =AS
- Develop the SCS triangular unit hydrograph for a 375-acre watershed that is an industrial district. The flow length is 1275 feet, the slope is 2.75 percent, and the soil is group C. Plot the resulting hydrograph. (similar to 8.8.1)Given the data below: Drainage area = 405 hectares Neglect base flow TIME Hr. 0 2 4 6 8 10 12 14 16 18 Determine the following a) Direct runoff depth (Dr) b) Unit hydrograph peak flow c) Effective duration ORDINATES OF FLOOD HYDROGRAPH cu.m/s 0 0.6 1.1 2.6 5.4 4 2.6 ft. 1.7 0.3 0 cm per cm of runoff ORDINATES OF 2HR UNIT HYDROGRAPH Per cm per runoff1. The 1-hr unit hydrograph for a watershed is given below. Determine the runoff for the third time interval from this watershed for the storm pattern given. The abstractions have a constant rate of 0.3 in/h. Time (hr) Precipitation (in) Unit hydrograph (cfs) 1 2 | 3 4 5 0.5 1.0 1.5 0.5 10 100 200 150 100 50
- If the following runoff is created by 5 hours of rainfall with a depth of 30 cm. What is the catchment area in sq km? Hours 0 2 4 60 00 8 10 12 14 16 18 20 22 Discharge (m3/s) Ancuier 4 0 21 48 33 24 18 13.5 9 6 4 5 0 SearchSeparate the baseflow from the stream flow hydrograph using the straight-line method. What is the baseflow? Calculate the direct runoff hydrograph (DRH) and plot it as an x-y scatter plot. Time (hr) Discharge (cfs) 0.0 60 0.5 54 1.0 50 1.5 90 2.0 137 2.5 176 3.0 200 3.5 198 4.0 140 4.5 97 5.0 60 5.5 40 6.0 35 6.5 32 7.0 29 7.5 24 8.0 22 8.5 20 9.0 20 9.5 19 10.0 19 10.5 18 11.0 18 11.5 18 12.0 175. From the 1mm 6 hour unity hydrograph given below, derive the 2 hour unit hydrograph. Time 12 18 24 30 (hrs) UH 15 8 3.6 0.6 0.0 (cumecs) What would be the peak surface runoff resulting from 3mm of rainfall falling in the space of two hours?