Polycast - Trench Drains (PC-1)

CHOOSING A SYSTEM

Hydraulic Capacity To ensure that the correct trench drain is selected for each site, several factors should be evaluated. The most important of these is hydraulic performance, or the ability of the drain to evacuate water without flooding.

p Calculate Flow The catch basin or drain outlet must be sized to meet the maximum amount of water to be evacuated from the site. This model is designed for rainfall run-off, but can be easily converted to industrial or overflow drainage. To calculate flow (Q) in gpm, the following parameters are needed:

C

B

Drainage area = length x width (A x B) Rainfall intensity in inches per hour (C)

A

Q

Area (AxB) x Rainfall (C) 60 (minutes) x 1.6 (conversion to gallons)

Q (GPM) =

Flow capacity for POLYCAST ® drains

400 450 500 550 350 300 100 150 200 800 850 750 900 950 700

HYDRAULIC CAPACITY 600 650

600 SERIES W/EXTENDERS

600 SERIES

Flow Rate (gpm) 250

50

0

0

20

40

60

80

100

120

Length of Run (ft) From Catch Basin

Catch Basin

Deepest Channel

Shallowest Channel

6