A Waterfall ...
|Pump Section - Water is supplied
via a main line and inlet (1), which is controlled
by a gate valve for initial filling at the pool.
A centrifugal end pump (2) re circulates water through
a butterfly valve (3) for adjustment to diverter
plates (4) located in the upper pool which evenly
spread the water for smooth flow over the weir (waterfall).
Water from the lower pool is returned to the pump
via an anti-vortex plates (5), butterfly isolation
valve (6), and strainer (7), for removal of coarse
material and protection of the pump.
Filter Section - Water is filtered
by a sand filter (8), which includes a self-priming
pump independent from the main fountain group. Water
is returned through a gate isolation valve (9) and,
adjustable inlets (10), which can be directed to
create turbulence in desired areas. Water enters
the filter via an anti-vortex plate (11), surface
skimmer (12), and a vacuum fitting (13); all connected
to a manifold (14). Each of these lines has an isolation
gate valve. The manifold is connected to the strainer
on a small self-priming pump which re circulates
the water from the pool through the filter. Chemical
addition is accomplished by use of a small metering
pump (15) on a tank which supplies hypochlorite
solution. An overflow drain (16) is set to eliminate
rainwater, etc., to prevent overflow. The pool can
be drained via the floor drain (17), which is controlled
by a valve in the valve box.
Electrical Control Section - An
electronic water makeup control replaces water lost
to evaporation, splashing, etc. This sensor (19)
and control (20) actuates a solenoid valve (21)
on the main water line to maintain water level.
Probes in the sensor are set to detect high and
low water limits. The underwater lighting fixtures
(22) are base mounted and connected to an underwater
junction box (23) by underwater cable. The junction
box is conduit-connected to the control box (24),
and completely potted to prevent leakage. The fixtures
contain integral low water cutoffs. The lights are
controlled by a timer or sequencer. The main control
box (24) houses the timers for valves and pump operation,
light controls, and water makeup controls. In addition,
it is the center for power distribution to various
components and contains circuit breakers, fuses,
motor starters, etc.
|This diagram illustrates the circuits
and components commonly used in the daily operation
of a typical waterfall; including a centrifugal
flooded end pump, a filtration and water treatment
system, underwater lighting and the necessary electronic
sensors and controls.