We had grass on 2 inches of soil over a yard of sand. The more soil you
have will reduce the amount you have to water to maintain your grass.

Dwayne

wrote in message
oups.com...
I am in the process of laying land drains in the form of buried
perforated pipe covered by stone chippings, as my lawn floods every
time it rains and simply becomes a bog.

Can any of the subscribers advise me of the minimum depth of soil I
require on top of the stone to support grass /lawn

Many Thanks.

Rick.