Hydrology . Thanks for the help
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- 4. 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.2) 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 60Question 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 cm
- Separate 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 17Calculate 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 weightedDevelop 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)
- 1. 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 50435.6 flow flow 2 hr For the given 1 hour unit hydrograph and watershed Find a) Qpeak b) the isochroous X and Y in hours с) с If X=1 in and Y=1 in (this may not be the answer to part b) find the runoff hydrograph every hour (c=1) for the given storm in 2 in hrDerive a 2-hr unit hydrograph using the Snyder method for a watershed of 70 km2 area, with a main stream that is 9 km long. Also, the distance measured from the watershed outlet to a point on the stream nearest to the centroid of the watershed is 5 km. Take Ct = 3.0 and Cp = 0.70. Graph the 2-hr unit hydrograph for the watershed.
- Calculate the runoff depth (inch) if: Rainfall (inch) = 2 Curve number =63 0.3 0.2 0.1 0.6 0.4 0.5Given 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 runoffIf 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 Search