158 NEW WATER SUPPLY SYSTEM AT TAMPA, FLORIDA.

Simplex controllers are used to control the rate of filtration. Thesehdis-
charge into control chambers located adjacent to a concrete filtered' waterr
conduit below the pipe gallery floor. The conduit carries the filtered winter
to the clear-water basin. Concrete sewers, installed underneath the ppe
gallery, carrythe waste water from washing and rewash to a 30-in. segm4atal
block sewer which discharges into the river below the dam almost a file
from the plant.
 Filtered Water Reservoir. The filtered water reservoir is a covered
basin of one-half million gal. capacity. It is 94 ft. square and divided into
two compartments by an end baffle wall. Inlet and outlet manhole? are
connected by a 36-in. cast-iron pipe allowing the water to be by-p ed
around the basin. From the filtered water basin, the water flows rto a
suction well adjacent to the pumping station where it is picked up b$ the
high-lift pumps and pumped directly into the distribution system.
 Landscaping. The new plant is located in the center of a wooded ark
embracing 55 acres, with about 2 000 ft. of lake frontage. Plans fo} the
development of the park with roads and tropical plantings have already
been made. A park boulevard linking it with a riverside drive and Other
.city parks is also contemplated. It is expected that the water-works plant
and park will be one of the show places in Tampa.
 Terraces surrounding the basins and filter plant have been laid opt so
as to dispose of all surplus dirt removed from the excavations. These
terraces will be planted with grass, and tropical shrubbery and plantings
will be set out.
 Transmission and Distribution of Water. A 30-in. cast-iron force iain,
approximately three miles long, carries the water into the city proper. j'The
main divides, upon reaching the built-up section, into two 24-in. $ines,
which parallel each other about one-half mile apart. Such necessary re-
inforcements of the old system as were required to give the proper distribu-
tion of water have been made.
 Three elevated tanks, each of 500 000 gal. capacity, have been erected
in different sections of the city, thus equalizing pressures and reducing the
peak loads on the plant.
 Fire Service Supply. The old 3.5 million gal. low-level covered con-
 crete reservoir, previously referred to and adjacent to pumping station No. 3,
 will be used to store a water reserve for fire protection. Two motor-driven
 centrifugal fire pumps, each of 5 million gal. per day capacity, have been
 installed in station No. 3. One of these pumps will be started as soon as a
 fire-alarm signal is received, drawing water from the reservoir and pugtpng
 into the distribution system. The development of excess pressures on'the
 distribution system is prevented by the use of a Ross relief valve placed
 on a by-pass between the suction and the discharge of the pumps.
 Provisions for Extensions. The entire works have been laid ou.and
 designed with particular attention to the making of extension. Estim ng
 the future population of Florida cities is an uncertain undertaking be use