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)
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- 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)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.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 0.80The 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/hrSince your team is doing such an outstanding job for your client, they requested a preliminary evaluation to estimate flow under the highway considering the implementation of a masterplan for the entire watershed that drains to the roadway. Your team developed the unit hydrograph below for a 1 hour storm duration. Calculate the watershed response to the hyetograph provided and provide the total peak flow (cfs). Table 1. Effective Precipitation Time [hr] P [in.] 1 0.5 2 2.5 Table 2. Unit Hydrograph Time [hr] QUH [cfs] 0 0 1 400 2 1600 3 800 4 0
- 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 2Subject water resource#8
- C9A 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 24Determine the direct runoff, the O-index, and the excess rainfall Set hyetograph for the storm given below. The water shed is 7.0 mi?. Label x and y axis for your graph. The baseflow is 300 cfs. Time Preciipitation Streamflow in 0.00 150 0.5 0.10 180 1.0 0.40 200 1.5 1.50 800 2.0 2.50 2000 2.5 2.00 5000 3.0 0.40 9000 3.5 0.10 10000 4.0 8000 4.5 4000 5.0 2500 5.5 1800 6.0 1100 6.5 700 7.0 300 7.5 290 8.0 270