SCN LOS er tt ee

f
$
d
i
i
:
é

i
$
i
z
i
Pa
4
2
é

Te Een an ncn eet yt AEN AMS Wr Ay atic

For sand base field construction,
nsideration for underdrains is not
2 illustrates th

are definite

ere prone to

damage d i be slighting higher due to

th f j The installation costs
i the mor

and the re

In summary:

~ the grid system has no apparent advantage

~ the lateral system provides better Coverage and a shorter flow distance to
the pipe
the Jateral system will be less expensive
the lateral system will be less prone to dam

Underdrain Pj

The use of "Big-O"

for playfield const

lightest of loads,

plug up than rigid

O" pipe is flexj is diffi Je placi

‘the surrounding drain rock. i Diameter is
ed

commonly & inches but 3 inch

eed

TA epee Caen ec ¢