Pipe Sizing and Runoff A development has a runoff coefficient of 0.4, a drainage area of 45 acres, and a 25-year intensity of 1.9 inch/hour. Find the peak flow rate using the rational method and size a circular pipe to convey the 25-year flow rate.
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- Runoff 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.What is the maximum population that can be served by an 8-in. sanitary sewer laid at minimum grade using a design flow of 400 gpcd (gallon per capita per day) and a flowing-full velocity of 2.0 ft/sec? (b) Compute the diameter of a storm drain to serve the same population based on population density = 30 persons per acre, coefficient of runoff = 0.40, 10-year rainfall frequency curve, a duration (time of concentration) = 20 min, and a velocity of flow = 5.0 ft/sec.8. 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.
- Find runoff R in cm.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 ft10. How would you determine the gap flow (i.e. major drainage system design flow) for an ARI = 100 years, taking into consideration that the minor drainage system which was designed for an ARI= 5 years is fully operational (i.e. unblocked-blockage is never an issue).
- Estimate ∅-index for a watershed having an area 5 acres. The runoff volume caused by the rainfall is 56000 ft^3. Round off your answer to the nearest whole number. Indicate the unit. Plot the hyetograph and superimpose the final ∅-index. (1 acre = 43560 ft^2) * Using the rounded-off ∅-index, estimate the volume of infiltration losses in cubic feet. *Redesign an existing rectangular storm sewer, 1.00m wide and 1.50m deep, into a circular section that will flow at maximum discharge. Use Manning’s equation considering s = 0.005 and n = 0.025. PLEASE INCLUDE COMPLETE SOLUTION AND DRAWINGWATER RESOURCES ENGINEERING: The ordinates a one-hour intervals of a unit hydrograph are 350.2, 753.2, 1556.0, 1980.1, and 224.3 cfs/in. Determine the direct runoff hydrograph from a three-hour storm in which 0.6 inches of rainfall excess occurred in the first hour, 1.3 inches in the second hour, and 0.3 inches in the third hour. What is the watershed area in mi2?
- WATER RESOURCES ENGINEERING A 6-hour storm event occured in the study basin. You were able to measure precipitiation and infiltration data, but not streamflow. Using the precipitation and and infiltration data and the unit hydrograph, estimate the total streamflow during and after this storm event. Calculate stream flow for each time step until the total streamflow is equal to the baseflow of 35 m3/s. Please refer to attached images of data tables:A 200-acre urban drainage area consists of three different watershed areas: 60% single-family, 30% neighborhood businesses, and 10% playground area. If the time to concentration is 2.00 hours, determine the depth of gutters needed in the development area if each gutter is to accept 1% of the total volumetric flow. The slope along the roadway is 0.0005 ft/ft and a gutter cross-section as shown in Figure 4. State all assumptions applied.2, Desigh a circular sewer running half- full for population 50,000 and if the manning's coefficient of toughness be 0.015 and longitudinal slope be 0.0001, determine dry weather flow ( DWF) . Take rate of water supply to be 100 l/c/d . Peak factor = 1.8. . Consider that 75% of water consumiotion by the community is converted to water.