For more general design and construction requirements that
pertain to all pools, see WAC
246-260-031.
(1)
Walking surface. A minimum
four-foot wide walking surface shall extend around the perimeter of a spray
feature sufficient that the spray will not exceed the walkway area in normal
conditions including light wind conditions.
(2)
Pool structure. Owners shall
ensure each spray pool has:
(a) Pool surfaces
with nonslip finishes impervious to water;
(b) Uniform pool floor slopes not exceeding
one foot of a slope for every twelve feet of horizontal floor length;
(c) A source of water for the spray feature
from an approved potable water supply;
(d) Water drained to waste disposed in a
manner approved by local authorities or the department after use in the spray
pool, unless it is recirculated with approved treatment as described in WAC
246-260-031; and
(e) The entire volume of water circulated
through an approved treatment system every thirty minutes or less if water is
recirculated.
(3)
Inlets. Owners shall ensure spray nozzles at each spray pool are
designed and maintained to not inflict physical damage to bathers. Design and
construction shall include evaluation of forces of the spray nozzle including
velocity, pressure and total force in proximity to bathers' eyes and other body
orifices.
(4)
Outlets.
(a) Owners shall ensure outlet drains are
designed and maintained to provide sufficient capacity to prohibit water
accumulation in each spray pool.
(b) Piping must be designed so velocity in
piping assuming one hundred percent of the pump recirculation flow does not
exceed six fps between the pump and the outlet drain.
(c) Each spray pool must have two or more
outlet drains that:
(i) Are located at the
low point of the pool;
(ii) Are
located at least three feet apart, measured between the centers of the drain
covers; and
(iii) Are manifolded
with junction fittings placed in the middle of branch line piping between
outlet drains, so that the length of branch line piping is equal on each side
of the junction fitting, see Figure 081.1;
Figure 081.1
Outlet Drain Branch Line Piping Detail
(iv)
Have drain covers removable only with specific tools.
(d) Multiple outlet drains must be designed
so that if one outlet drain becomes blocked, the remaining outlet drains are
rated to at least one hundred percent of the maximum pump flow; see Table
081.1.
Table 081.1
Outlet Drain Flow Rating Requirements
|
|
Number of Outlet Drains per Recirculation
System
|
|
2
|
3
|
4
|
5
|
|
Outlet drain rated flow capacity must be at least
equal to the percent of maximum pump flow indicated, depending on the number of
outlet drains.
|
100%
|
50%
|
33.3%
|
25%
|
(e)
Outlet drains that are accessible to pool users and submerged must:
(i) Conform to the suction fitting standard;
and
(ii) Have a maximum flow of one
and one-half feet per second through the cover.
(f) Outlet drains that are accessible to pool
users and not submerged must have:
(i)
Openings that prevent the passage of a sphere over one-half inch in diameter;
and
(ii) Drain covers that
withstand forces of users.
(5)
Emergency equipment. No
later than June 1, 2008, owners of existing pools with single main drains shall
install emergency equipment to shut off all pumps hooked to the recirculation
lines for the pools. This emergency equipment must be placed within twenty feet
of the pool and marked with an emergency shutoff sign. The shutoff switch must
include an audible alarm which can be heard by those in the area, or the switch
must have an alarm that goes to a point where staff is always present during
the periods the pool is open.
(a) Pools that
include dual main drains meeting the requirements of this section, or other
acceptable methods of providing equivalent protection to the emergency shutoff
switch, are exempt from this requirement.
(b) The owner shall check the shutoff switch
at least twice annually to determine it is properly operating.
(c) The department will develop a guidance
document to aid owners and designers in potential options to the emergency
shutoff switch and audible alarm.
