Chapter 14, Problem 14P

Example 10.1. A town with a population of 1 million has a con- tinuous water supply. Average supply in 270 lpcd, the water being supplied by direct pumping. The total supply of 270 lpcd is phased as follows: Time 5 A.M. to 11 A.M. 11 A.M. to 3 P.M. 3 P.M. to 9 P.M. 9 P.M. to 12 midnight 12 midnight to 5 A.M. Water is supplied from the treatment plant at a uniform rate of 11.25 million litres per hour, for all the 24 hours. Find out the capacity of the reservoir required for distribution of water. Assume no loss or drawal from the trunk main. (A.M.I.E., May 1963) lpc 90 54 81 27 18

A manufacturing facility consumes 40 m^3/h of water taken from a nearby river located 15 m below the factory tank.Calculate the daily pumping cost if water is conveyed through a 3in, 240 m-long pipe, including friction losses. The cost of electrical energy is 0.831 pesos/kilowatt-hour and the pump operates with 80% efficiency.

Compute the minimum water horsepower of a pump needed to pump-out water at a rate of 300 gpm with a total head of 6 m. The pump efficiency is about 60%.

Water is pumped 14.5 km from a reservoir at elevation 30 m to another reservoirat elevation 70 m. The steel pipeline connecting the reservoirs has a nominal diameter of 1400mm (the actual inside diameter is 1372 mm) with C = 90. If the flow is 1.18 m3/s, the pumpingefficiency is 82%, and electricity costs $0.14/kWh. Assuming that the density of water is 1000kg/m3, what will be the monthly power bill? Sketch the hydraulic and energy grade lines.

Water at (20°c) is to be siphoned through a tube (1m) long and (2mm) in diameter, as shown in figure. If the viscosity equals to (0.001 Pa sec), the height (H-50 cm) and the flow is laminar, what is the flow rate ?

During a particular 30-days period, the streamflow flowing into a reservoir averaged 5.0 cubic meter per second. Water supply withdrawals from the reservoir averaged 136 mgd (million gallon per day). The only other outflow from the reservoir was 9.4 cm of evaporation from the reservoir water surface. The average water surface area of the reservoir during the 30 days was 3.75 sq.km. The reservoir had 12,560 ac-ft of water in storage at the beginning of the 30-days period. Determine the storage content at the end of the 30 days in units cu.m.

The discharge of water through a rectangular channel of width 6.0 m, is 18 m3/sec when depth of flow of water is 2.0 m. draw Specific Energy Graphs and find : a) Critical depth b) Specific Energy c)Minimum Energy d) Critical velocity

Compute the horsepower required to pump :   a) A stream of 60 liters per second against a head of 12 meters, assuming 100% efficiency.    b) Actual pumping plant efficiency is 59%. What is the horsepower requirements?

A rectangular channel has a width of 8 m and flow rate through it is 25 m/s at a section where depth of flow is 2.5 m. Find : a.Specific energy of water flowing through the channel. b. Critical depth. c. Critical velocity. d. Minimum specific energy