§604.1305. Overflow

a)         All water storage structures must be provided with an overflow that is brought down to an elevation between 12 and 24 inches above the ground surface and that discharges over a drainage inlet structure or a splash plate.

 

b)         No overflow may be connected directly to a sewer or a storm drain.

 

c)         All overflow pipes must be located so that any discharge is visible.

 

d)         Overflow for a ground level storage reservoir must meet the following requirements:

 

1)         open downward and be screened with 24 mesh non-corrodible screen; and

 

2)         when a flapper or duckbill valve is used, a screen must be provided inside the pipe.

 

e)         Overflow for an elevated tank must:

 

1)         open downward and be screened with a 4 mesh, non-corrodible screen or mechanical device; and

 

2)         when a flapper or duckbill valve is used, a screen must be provided inside the pipe.

 

f)         The overflow pipe must be of sufficient diameter to permit waste of water in excess of the filling rate.