1st 2 posts got botched, so here goes again:

i dammed up a valley on my property several months ago. now water is seeping out of the ground on the dry side of the dam. i've been comparing the pros/cons of bentonite & epdm liner. the liner sounds to be a better & pricer solution. i read an old post the other day stating you should cover a liner w/ about a foot of soil. this was the 1st i'd heard of this procedure & it would add signifacant cost to the liner option. what is everyone's experience w/ adding/not-adding a layer of soil above the liner?