A watershed with an area of 4.0 ha has a composite runoff coefficient of 0.60, find the peak rate of runoff for the 5-, 10-, and 20-yr storms. Assume a time of concentration of 15 minutes. Use MTO IDF Curves Finder to find IDF parameters for McMaster University Location
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A watershed with an area of 4.0 ha has a composite runoff coefficient of 0.60, find the peak rate
of runoff for the 5-, 10-, and 20-yr storms. Assume a time of concentration of 15 minutes. Use MTO IDF
Curves Finder to find IDF parameters for McMaster University Location
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- The area under consideration is 250 acres of open pasture and you intend to pave 30% with reinforced concrete. You determine that the time of concentration for this area will decrease from 3 hours to 40 minutes after the ramp is in place. Currently a grass-lined drainage ditch carries the runoff for the 250 acres. For runoff coefficients, use the highest published range value in the approriate category.a) If you design for a 50-yr storm, how much will the peak runoff flow rate change? Reportthe answer as a % increase in flowrate.b) Determine if the drainage ditch will still be capable of carrying the runoff once thepaving is complete.c) What happens if the drainage ditch is paved with float finished concrete? How deep isthe flow? n = 0.025s = 1%ymax = 3 ftThe ordinates of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5 cm for the first six hours and 15 cm for the second six hours, compute the direct runoff hydrograph ordinates and plot the hydrograph. Compute the depth of direct runoff in cm. Assuming constant baseflow of 100 m^3/s, compute the storm hydrograph ordinates and plot the hydrograph. (List all the DRH ordinates in order, separated by a single space.)Problem 3.24 (page 119): The soil in a watershed has the following properties: 0, = 0.02, 0fe= 0.25, and 0 = 0.38. The watershed has a composite ARC II curve number of CN 80. A storm with a rainfall of 30 mm occurs in dormant season. During the five days before the storm begins, the total rainfall is 25 mm. Estimate the direct runoff from this storm using the MORE and SCS-CN models. %3D %3D %3D
- 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 GFrom the the given table, determine the direct runoff if the effective rainfall during 1-hr is 5 mm if the 1-hr UH due to 1 mm effective rainfall is known: Time (hr) UH (m^3/s) Q direct 3. 2. 3. 1. 4. Write the answer and attach the solution.A 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 24
- The ordinates of a hydrograph of surface runoff resulting from 4.5cm of rainfall excess of duration 8 hours in a catchment are as follows. Determine the ordinates of the 8h unit hydrograph for this catchment. Tabulate your solution and plot the 8H-UH.The ordiantes of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5cm for the first six hours and 15cm for the second six hours, compute the direct runoff hydrograph ordiantes and plot the hydrograph. (List all the DRH ordiantes in order)Rational Method: Determine the pre (C = 0.3) and post development (C= 0.75) peak runoff for a 90-acre site that experiences a 0.35 inches/hour rainfall intensity, using the rational method. Show all your work, including any assumptions you will make.
- Problem 1b: For a 15-acre watershed, a time of concentration of 75 minutes, a 7" storm event, and a CN of 75, determine the total time over which runoff occurs (hydrograph base) in hrs. Use the Rational Hydrograph.Risk and reliabilityA recreational park is built near Buffalo Creek. An adjacent stream channel can carry a peak 5-year runoff of 200 m3/s, above which the park will flood. Find the following: a. The probability that the park will flood next year. b. The probability that the park will flood at least once in the next 10 years. c. The probability that the park will flood three times in the next 10 years. d. The probability that the park will flood 10 times in the next 10 years.Calculate the runoff from a watershed of (0.01 x 4737) ha. The following data are available: Depth of rainfall is 100 mm. Antecedent rainfall condition, AMC 1: Row crop, good condition in 40 ha (Soil group C) Woodland, good condition in 20 ha (Soil group B) The day after the rainfall of 100 mm, another rainfall of 50 mm occurred. Solve for the surface runoff from the watershed. [ NOTE: Where R is the last four digits of your Registration Number. R = 4737 ]