Polycast - Trench Drains (PC-1)

800 SERIES MAXI

Grate In-Flow Chart

Quantity of Flow Through 800 Series Grates

Based on 1' 825 Channel Computed using Orifice Equation Q=CA 2gh

1.25

561

DG0841 DG0844

1.00

449

.75

336

GPM

224

.50

800 SERIES MAXI

112

.25

QUANTITY OF FLOW (Q) IN CUBIC FEET PER SECOND

.1

.25

.50

.75

1.0

Head of Water Above Grate in Feet

TIPS Choke Points: Outlet pipes must be capable of more flow capacity than the trench drain system or the whole system can back up.

TIPS Up Against a Wall: Trench drain should be placed at least 4 inch away from walls to ensure prop encasement.

Expansion Joints: Trench drain channels should never be used expansion joints as this can ca weak points in both the drain a surrounding slab.

Expansion Joints: Trench drain channels should never be used as expansion joints as this can cause weak points in both the drain and, surrounding slab.

TIPS Rainfall: Rainfall frequency and intensity charts can be found at: http://www.noaa.gov

TIPS

35

Choosing A Trench Drain - Outlet Type