A flood control structure having an expected life of n years is designed by considering a flood of retur period T years. When T = n, and n→ ∞, , the structure's hydrologic risk of failure in percentage is. (round off to one decimal place) Enter Your Answer... Check
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- A well produces water from a confined aquifer at a rate of 550 m3/day for a period of 30 days, and then the pumping rate decreases to 300 m³/day for another 20 days. What is the resulting drawdown at the well at the end of this 50 day pumping period if T = 50 m²/day, S = 0.001, and the well radius in 0.2 m?Q.5. Floods in a stream have the mean 600 m3/s and the standard deviation 400 m3/s. Pleaseanswer the following questions assuming normal distribution.a) What is the probability that the flood flow any year exceeds 700 m3/s?b) What is the 100-year flood discharge?IF the non-exceedence probability of a hydrologic event is 0.80, then the return period for this event is: a) 50 years b) 10 years c) 5 years d) 1.25 years
- A trapezoidal channel with a base width of 20 ft and side slopes of 2H:1V (2 horizontal to 1 vertical) carries a flow of 2000 cubic feet per second at a depth of 8.0 ft. There is a smooth transition to a rectangular channel 20 ft wide accompanied by a gradual lowering of the channel bed by 2.0 ft. Calculate the depth of the water within the rectangular channel in feet using a solver. Choose the most appropriate of the two solutions and support your answer.As shown in the figure below, a pump lifts water through a 100-mm diameterductile iron pipe (friction factor f = 0.0251) from a lower to an upper reservoir. If the differencein elevation between the reservoir surfaces is 10 m, and the pump performance curve is givenby H = 15 – 0.1Q2, where H is in m and Q in L/s.a. Determine the system head curve (relationship between TDH and Q) assuming theentrance and exit loss coefficients are both 1b. Estimate the flow rate through the systemc. If the minimum NPSH for this case is 1.5 m, determine the maximum height above thelower reservoir that the pump can be placed (assuming that the atmospheric pressure Pa=101 kPa, specific weight of water ? = 9.79 kN/m3, and the water vapor pressure Pv= 2.34 kPa).A hydraulic jump forms in a 3-m wide rectangular channel that carries a discharge of 10 cms. The depth downstream of the jump is measured to be 2.5 m. What is the percentage of energy lost in the jump? a. 33.07% b. 44.58% c. 55.42% d. 66.93%
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- Calculate the depth of water at the downstream of a hydraulic jump in a rectangular channel, where the flow rate is 3.1 m3/s, channel width is 1.5 m and upstream depth is 0.2 m. Choose one: 2 m 0.8 m 0.2 m 1.3 mA concrete dam and the flow net are shown in the Figure below. The following parameter are-5 3 given as: Nd=12, Nf=3.8, k=2.6X10 m/sec, and Ɣsat=19.5 kN/m .a) Calculate the total quantity of water lost by seepage in m3/day.b) What is the water quantity for each flow channel?c) What is the reading of pizometer if its location 1.5 m above datum?d) What is the factor of safety against piping at the down stream?A reservoir is to be constructed at a location where monthly flow data are available for 20 months. It is required to release 35 MCM of water from the reservoir every month. Find the minimum size of the required reservoir by the Sequent Peak Algorithm. answer this. need graph on excel.