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)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 GFor 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 0.80
- The 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 0After 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.
- 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 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 availableRunoff data have been collected for a 4-hour storm over a 120 acre watershed as indicated in the table. If the total volume of water infiltrated during the storm was 3.0 Ac-ft and the Phi Index is 0.1 in/hr, sketch the rainfall hyetograph with EVERYTHING labeled appropriately. Also, report the depth and volume of precipitation (in inches and Ac-ft, respectively) for each 1-hour period.
- Use 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 10-12A 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 flowrate at the outlet of a watershed for 2-hr rain event is given in the table. Base flow is 20 cfs and the runoff depth is 2 inches. Determine 2-hr UH. Must use table format to show details of your solutions. time, hr Q, cfs 20 1 26 2 30 34 4 28 24 6 22 20