Drainage issues

G'day all,
My property has some overland drainage issues. My block is benched into the land and has had problems with water run off.

So far I have fitted 3 drains down the side of my house and just had a bobcat level my yard. I then laid topsoil and got the yard to fall to two other drains I installed in the yard. All the drains are connected to storm water. The other night we had 52mm of rain fall in 2 hours and the drains coped with the influx of water.

I have one part of the yard which still floods. Unfortunately it is in the garden and also next to the garden shed, so the shed ends up full of water. I have dug down and located the storm water pipe and intend on installing another drain. The biggest problem I can see is by installing this drain in the garden, Its going to get blocked with leaves and mulch.

What I am thinking of doing is installing the pit 100 - 150mm below the top level of the garden then lay gravel over the top. Im assuming that this will allow the water to drain away relatively quickly without the drain blocking up. Am I on the right track?

The pits I have been using are similar to this one and available from bunnings. http://www.everhard.com.au/images/pr...nisedGrate.jpg

Cheers
Steve


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