Q

=

394 gpm (available from aquifer)

The well should be designed to be drilled to the bottom of the aquifer. Screen manufacturer's

literature shows that an 8" diameter telescoping screen has an intake area of 113 sq. in. per ft.

of length; calculate length of screen required using equation 5-5:

Q

L

=

A V (7.48)

350

L

=

(113/2/144) (4) (7.48)

L

=

30 ft.

Note that the pumping water level will be above the top of the screen. Check screen entrance

velocity:

(350 gal/min) (.00223 cu. ft.-min/gal-sec)

V

=

(30 ft) (113 sq. in/ft)

V

=

.01 ft/sec (ok)

B-4. LOCATION. The well should be installed near the test pumping well (PW) and

observation well (Wl) as shown on figure B-1. The exact location may be influenced by

location of access roads, fences and other details. This leaves room for construction of an

additional well for future expansion of the facility, north of the observation well (W2) which

would be beyond the 250 ft. minimum spacing required.

B-5. WATER QUALITY. Samples are taken and analyzed in accordance with Standard

Methods. Although the water quality is such that no treatment is required, chlorine will be

added as a disinfectant in accordance with standard practice.

B-6. PUMP SELECTION. An elevated storage tank will be installed in the area of the facility

to maintain a 40 psi minimum distribution system pressure at the maximum ground elevation of

820 ft. Approximately 1500 lin. ft. of 6-inch pipe will be required from the well to the tank.

Calculate the TDH using equation 5-6.

a. Suction head is the distance from the ground (pump level) to the lowest elevation of

water in the well. Assume this would be at the top of the screen. Add the distance to the

water table plus depth of top of screen.

B-3

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