by embankments across low places in the rim.
_Service Reservoirs_.--At Coyote, an artificial service reservoir, 100
by 200 ft. on the bottom, with slopes of 1-1/2 on 1 and a total depth of
15 ft., serves as an equalizer of the flow to and away from the pumps
at that point. The pump-house is built alongside this reservoir. The
delivery pipe from the Nogal Reservoir runs directly to the pumps, but
has a tee-branch, 50 ft. long, into the Coyote Reservoir. This branch
passes through a valve chamber between the pump-house and the reservoir.
In this chamber there are controlling valves and an automatic overflow.
This overflow is provided against the contingency of a full reservoir
and idle pumps. If the pipe line is delivering water faster than the
pumps discharge it, the surplus goes into the reservoir. This
arrangement is self-acting and controlling. There is a similar
arrangement at the Luna pumping plant, also at the Carrizozo service
reservoir, and at the regulating reservoir on the Corona summit.
Each of the four service reservoirs is of the same size, and lined with
4 in. of 1:2:4 concrete. At Luna and Corona the concrete is reinforced
with 3/8-in. round rods spaced 12 in. from center to center, both ways.
This reinforcement should have been used in all the work.
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