Determine the hydrologic risk of a 287-year flood occurring during the 34-year service life of a project.
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- Since 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 02. In an effort to control the destructive power of water during extreme conditions, a planned flood discharge with a certain return period is required as input for water structure design data. Explain what is meant by return period and how to determine the design flood discharge using a number of maximum daily discharge data?Choose the correct statement/s in the following:Hydrologic studies are made (i) to determine MPF (ii) to determine design flood for spillways and bridges (iii) to asses the ground water potential of a basin (iv) for the preparation of land drainage schemes (v) to determine the hydro-power potential (vi) for irrigation and crop planning (vii) for all the above
- Identify the hydrologic processes that affect flood runoff from a 3000-ft section of interstate highway and the accompanying grass-covered right-of-way. Which processes are most important in determining the flood runoff from the site?hydrology engineeringcatchment areas are given in Table 2-1. (a) Using the given IDF curves and the Rational method, calculate the 50-years design peak flow (in cfs) at the catchment outlet. (b) A levee is to be designed to protect the area near to the catchment outlet using the estimated peak- flow. If the design life of the levee is 20 years, calculate the probability (%) of failure of the levee during its design life period. Area 1 A1 A2 Area 2 C1 Table 2-1: Sub-catchment properties ti Catchment property Area 1 Area 2| Area 3 Catchment area ( km²) 10 20 Area 3 A3 Runoff coefficient 0.2 0.9 0.4 C3 Time of concentration (minutes) 20 10 20 t3 Catchment outlet Figure 2-1: Watershed IDF curves for storms in vicinity of example site 9 50 8 25 8 7 1아 5 4 3 2 1- 1 05 10 15 20 30 40 50 60 70 80 90 100 110 120 130 Time (min) Intensity of rainfall (in./hr)
- As a site designer, you need to calculate the volume of stormwater for a 15-acre drainage area with the following conditions. Which method will you use to accomplish the task? Storm frequency = 50 years Runoff coefficient = 0.35 Storm duration = time of concentration = 15 minutes O O A. Rational Method B. Modified Rational Method C. Either Rational Method or Modified Rational Method OD. Neither Rational Method nor Modified Rational MethodUsing the total storm rainfall depths given, determine the average rainfall over the watershed using the arithmetic mean method.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.
- Structural flood measures: 1. Are Best under all circumstances, simply because they control the peak and volume of hydrographs 2. Consist of levees, diversion works, retention basins, and land use zoning methods 3. Are the preferred approaches to combat climate change 4. May spur investment on floodplains, but can result in greater losses, were they to fail A) 2 Only B) 4 Only C) 2 and 4 Only D) 1 and 4 OnlyProblem 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.5c) In determining the flood-prone areas around the dam construction area, howwill can a drainage surface be used to establish a watershed for the area?