What is the peak flow from a watershed with 5 acres and runoff coefficient of 0.7, for a 10-year return storm over 2 hours period using the Rational Method? (Use the IDF for Washington, DC)
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- After a 2-hour storm, a station downstream from a 40 square mile drainage basin measures 9300 cfs as a peak discharge and 3400 acre-feet as total runoff. Find the 2-hour unit hydrograph peak discharge.What is the peak flow from a watershed with 2 acres and runoff coefficient of 0.8, for a 25-year return storm over 30 min period using the Rational Method? (Use the IDF for Washington, DC)Problem-1 A watershed is divided into sections as shown below. Runoff from each section will contribute to flow at gauge G as indicated in the table. For an excess rainfall intensity of 0.5 in/hr falling uniformly for 5 hrs, determine the resulting direct runoff hydrograph (DRO). D A C D Area [ac] 150 250 350 200 Time to G [hr] 2 4 G
- For the given rainfall data, compute the runoff volume if the index is 0.9 in/hr. The watershed area is 0.785 mi². t(hr) 0-3 3-5 5-8 8-11 11-12 i(in/hr) 1.20 2.10 1.30 1.00 0.80A 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 24The rainfall on five successive days in a catchment were measured as 3, 8, 12, 6 and 2 cm. If the total runoff at the outlet from the catchment was 15 cm, the value of the -index (in mm/hour) is (a) 0.0 (b) 1.04 (c) 1.53 (d) Sufficient information not available
- A rainfall hyetograph is provided for a 6-hour storm event, which occurred over a watershed with an area of 2100-acres (Ac). If the Phi-index is 0.71 in/hr, calculate the volume of runoff (VRO) from the storm (in Ac-ft). Report your answer to the nearest tenths (0.1) place. HINT...the answer should be around the 500-1,500 Ac-ft range (yes, it is a big range if you need to guess). Intensity (in/hr) 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 Time (hr) 5 6 7 2The table below shows the observed rainfall intensity on a 2.26 km2 catchment area. Estimate the o index if the observed runoff is 282 097 m³. Time (hr) Rainfall (mm/hr) O to 2 35.6 2 to 5 58.4 5 to 7 27.9 7 to 10 17.8 10 to 12 7.6 O 25 mm/hr O 29 mm/hr O 27 mm/hr None of the choices O 23 mm/hrUse the rainfall data below to determine the o index for the watershed if the runoff depth was 8.2 in. Time (hr) Rainfall (in/hr) 0-1 0.85 1-2 1.2 3-5 1.6 5-7 2.9 7-10 2.4 1.8 10-12
- 4. A 4-hr storm rains on a 100 km² drainage watershed. The surface runoff data from a gaging station draining the watershed are given below: Time (hr) 0 2 4 6 8 10 12 14 16 18 20 22 Direct Runoff, Q (m³/s) 0 0 200 600 900 700 500 300 200 100 0 0 (a) Construct the unit hydrograph for the 4-hour storm. (b) Find the runoff rate at t = 10 hr from a three-storm system: The first storm has an average depth of 6 cm starting at t = 0 hr. The second storm has an average depth of 14 cm starting at t = 4 hr. The third storm has an average depth of 8 cm starting at t = 6 hr.435.6 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 hro. Determine the mean runoff flow in cfs from a drainage area of 175 acres using the English equation for a 25-yr frequency in inches per hour in Nevada, The area is sloping at 2% and is covered with poor surface grass. The furthest point from the inlet is 72 meters.