Minnesota Administrative Rules

4717.2590 OVERFLOW GUTTERS.

Subpart 1.

General.

Overflow gutters must extend completely around the pool except at steps or recessed ladders.

A.

The overflow gutter must also serve as a handhold.

B.

The gutter must continuously remove 50 percent or more of the recirculated water and return it to the filter.

C.

Pools with overflow gutters must be provided with surge capacity.

D.

The gutters, drains, and return piping must be sized to remove overflow water caused by recirculation, displacement, wave action, or other cause produced from maximum pool user load.

E.

Drain outlets must not be more than 15 feet apart.

F.

The opening into the gutter beneath the coping must not be less than four inches wide. The interior of the gutter must not be less than three inches wide with a depth of at least three inches.

G.

Gutters must be designed to prevent the entrance of or entrapment of a user's arms or legs.

H.

The overflow edge or lip must be rounded and no thicker than 2-1/2 inches for the top two inches.

I.

Overflow outlets must have outlet pipes at least two inches in diameter.

J.

Outlet fittings must have a clear opening in the grating at least equal to 1-1/2 times the cross sectional area of the outlet pipe.

K.

New overflow gutter system installations must include automatic water level control to provide automatic and continuous skimming during quiescence.

Subp. 2.

Surge systems and surge capacity.

An in-pool surge system may be used only if it is part of an engineered and manufactured gutter system that has surge weirs which provide effective skimming during quiescence.

A.

In-pool surge weirs must be self-closing during normal pool use.

B.

The total surge capacity of the system must be at least one gallon per square foot of water surface.

C.

If some of the surge capacity is within the gutter system, the system must be able to carry 50 percent of the recirculation flow while maintaining the surge capacity.

Subp. 3.

Rollout and deck systems.

Nothing in this part precludes the use of a rollout overflow system or deck level system if proper surge capacity is provided as specified in subpart 2.

Statutory Authority:

MS s 144.05; 144.12; 144.123; 145A.02; 157.01

History:

19 SR 1419; 19 SR 1637

Published Electronically:

May 11, 2009