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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- The 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 20Problem-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%VY . Q1: A catchment area is 5 square miles and the total direct Runoff (E D. R = 11150 ft / sec). Estimate the base flow for the data shown in the table below? Time 2 3 4 5. 6. 500 500 1200 2250 2920 2670 2060 1430 Total Flow(ft/sec) 202.57 | 506.43 700.32 627.97 451.44 269.13 11 U.H 10 1100 910 Time 9 12 13 14 15 16 Total 780 650 530 510 510 500 Flow(ft'/sec) U.H 173.6 118.65 81.03 52.09 28.94 11.57 2.89 Q2: Develop a 3-hr synthetic unit hydrograph for the catchment are using Snyder's method only. If the catchment area is 400 kan?, L= 25 kam and La km, assuming C15 and C,-0.7 •,.0 |||||||||||||1||||||| إلغاء إعادة تعي ين
- 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 hr10. 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).Q2/A storm is proposed to drain a 16 hectares drainage area shown in the figure (2)below with given data in the table below determine the design discharge needed to convey 5-year 2500 peak discharge when i= t+20 Site Area Inlet t B A 6 10 A(residential) B(roofs) 30 11 =15min 10
- Find the diameter of the sewer pipe to carry runoff discharge (m^3 /sec) at full flow condition for the catchment region of area 100,000 m^2, (C= 0.35). The time of concentration is 15 minutes and (i = 5230 It+30)? assume the flowing velocity is 1 m/sec? * - 0.9 m = 1.4 m = 1.0 m = 1.2 mo. 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.Which one of these processes is considered losses in the sub - surface flow ? A- Groundwater flow. B- Runoff. C- Infiltration. D- Sub surface outflow. What is the correct answer?? C-
- Find runoff R in cm.The sewage from an area of 400 acres is to be carried by a circular sewer at a velocity not less than 2.5 fps. Manning’s n = 0.013. The population density is 16 persons per acre. Find the maximum hourly and minimum hourly flows. Determine the pipe size required to handle these flows and the required slope. Assume typical per capita sewage quantities and typical peak factors for the determination of maximum and minimum hourly sewage flows. Allow a maximum velocity of 10 ft/sec and allow the pipe to flow full under maximum hourly flow conditions.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/hr