# reservoir

## Three Reservoirs Connected by Pipes at a Common Junction

**Situation**

Three reservoirs *A*, *B*, and *C* are connected respectively with pipes 1, 2, and 3 joining at a common junction *P*. Reservoir *A* is at elevation 80 m, reservoir *B* at elevation 70 m and reservoir *C* is at elevation 60 m. The properties of each pipe are as follows:

*L*= 5000 m,

*D*= 300 mm

Pipe 2:

*L*= 4000 m,

*D*= 250 mm

Pipe 3:

*L*= 3500 m

The flow from reservoir *A* to junction *P* is 0.045 m^{3}/s and *f* for all pipes is 0.018.

- Find the elevation of the energy grade line at
*P*in m.

A. 75.512

B. 73.805

C. 72.021

D. 74.173 - Determine the flow on pipe 2 in m
^{3}/s.

A. 0.025

B. 0.031

C. 0.029

D. 0.036 - Compute the diameter appropriate for pipe 3 in mm.

A. 175

B. 170

C. 178

D. 172

## 025 Review Problem - Time required to fill a reservoir of water

**Problem 25**

A reservoir 10 ft. deep is in the form of a frustum of inverted square pyramid with bases of 100 and 90 ft. on a side respectively. How long will it require an inlet pipe to fill the reservoir if the water pours in at the rate of 200 gal. per min.? (One gal. = 231 cu. in.)