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Hydraulic
Understanding Hydraulics
175 SOLVED PROBLEMS
Question: 3.SQ.2
For the vessel in Example 3.4, suppose the same movement of the jockey weight had produced angles of tilt of 10° and 40°. What would you conclude about the stability of the vessel under these circumstances? ...
Verified Answer:
GM =\left(300 \times 10^3 / 50 \times 10^6\...
Question: 14.2
A reservoir has a constant surface area AWS of 0.15 km². The inflow hydrograph to the reservoir is shown in the first two columns of Table 14.2. The outflow from the reservoir is over a broad crested weir that has a coefficient C = 1.6 and a breadth b = 10 m. Assuming that initially QI = QO, using ...
Verified Answer:
Equation (14.4) can be rearranged as:
A_{ W...
Question: 14.1
A roof of area 80 m² drains to a rectangular soakaway like that in Fig. 14.6. It is to be designed for rainfall with a return period of 30 years. Assume W = 1.2 m, dS = 1.5 m, the void space (porosity) of the granular fill is 25% (i.e. 0.25), and the soil percolation rate (f ) is 2.78 × 10^- 5 m/s. ...
Verified Answer:
In this example R can be obtained indirectly from ...
Question: 13.SQ.7
The data below are the minimum instantaneous discharges recorded at a gauging station during a period of 10 consecutive years. There is a proposal to abstract water from just above the gauging station. Determine in how many years on average the flow is likely to be less than 1.50 m³/s. Comment upon ...
Verified Answer:
Table STQ13.7 shows the ranked data and calculated...
Question: 13.SQ.6
Continue Example 13.10 by assuming that the reservoir is still full initially, but the maximum reservoir storage is now limited to 15.00 × 10^6 m³. (a) What is the maximum uniform demand that can be maintained throughout the year, and (b) how much water will discharge over the spillway? ...
Verified Answer:
The cumulative inflow, ΣI, is as in Example 13.10,...
Question: 13.13
A non-equilibrium pumping test has been conducted in a confined aquifer. The time since pumping started and the corresponding drawdown in an observation hole 91 m from the pumped well are listed below. The pumping rate was 1800 m³/d. Using a Jacob analysis, determine the value of T and S. ...
Verified Answer:
The data are plotted as the drawdown–log time grap...
Question: 13.12
A flow net for part of a confined aquifer is shown in Fig. 13.24. At point P the permeability is estimated as 2.5 m/d and the corresponding distance (L) between successive contours is 3 km. The aquifer is approximately 45 m thick. Estimate the flow though the aquifer. ...
Verified Answer:
The contour interval Δh = 10 m, so h = Δh/L = 10/3...
Question: 13.11
It is observed that the water table in an unconfined aquifer that extends over an area of 250 km² has an average annual rise of 5 m. The porosity of the material is estimated to be 12% and its specific yield 7%. (a) Determine the annual volume of recharge. (b) Estimate the maximum volume of water ...
Verified Answer:
(a) The recharge volume = annual rise × area × por...
Question: 13.10
Using the same data as in the previous example, draw the mass flow curve and (a) determine the storage required to meet the given demand; (b) investigate the maximum possible demand that could be obtained, and any additional storage requirement. For convenience, assume each month has 30 days. ...
Verified Answer:
The cumulative mass inflow and outflow curves must...
Question: 13.9
The figures below show the riverflow in units of 10^6 m³ at a potential reservoir site during a drought year. To be viable, the reservoir must provide at least 5.00 × 10^6 m³ per month throughout the year. A constant compensation flow of 0.81 × 10^6 m³ per month must pass through the dam (including ...
Verified Answer:
(a) The yield can be sustained during the dought y...
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