Nov 09, 2011 3:21 pm
We have a bit of a problem on our 1 yr old home that when we get heavy rain, the side of the house is getting a lot of water and it isn't draining away as it should.
I need to get this resolved, from the docs I got with the house our soil site classification is Class S (Slightly Reactive), slope flat, drainage poor. Silty Sandy Clay. The engineers report says there should be a minimum 1:20 grade fall around the perimeter of the house.
Reading the CSIRO guide, says you should have at least 900mm of paving around the perimeter with a minimum fall away from the building of 1:60.
The builder handled all the landscaping (we bought house as a brand new/finished home, rather than a turn key or building ourselves)...I don't know if there is any scope to go back to the builder saying he should have followed the suggestions of a 1:20 fall for the landscaping (currently just big pebbles), as some of it slopes towards the house so when you get heavy rain it flows and pools right next to the slab.
What is the best cost effective option to try and resolve this problem? I would like to do work myself if possible, but its a case of get it done and done right the first time so if this needs a professional then I need to get one in:
1. A grated drain system along the side of house, either along the fence line or right next to the slab/wall of house?
2. Install ag pipe and connect to stormwater drainage
3. pave right along with normal pavers
4. get a concrete path installed
5. pull up all the pebbles and get the soil sloped from the slab down to the fence line to try and divert water away from the slab
6. something I haven't thought of?
Here is a photo after rain
The house has those Leaf Eater downpipes which when we get really heavy rain the water seems to gush out of the gutter and be going too fast to then drop into the Leaf Eater attachment..and some of it spills along this flooded area. Should I buy a bit of stormwater pipe and take the mesh cover off this leaf eater to try and get it to capture all the water better, ideally I would rather have a problem with some leaves in the tank filters than a flooded side of house (plus we have no trees anyway so no leaves). Some of the flooded water is coming from a vacant block and I suspect once they build the amount of water will be greatly reduced, someone suggested I dig a trench in the vacant block along the fence to try and stop the water flowing into my block,,? Would this do much or after heavy rain it fill up with mud and be back to square one? We have 1 stormwater drain on each side of the house and one in the back lawn.
Re: Side of house drainage issues2
Nov 09, 2011 3:28 pm
hubbi put this drain in, he used aggi pipe all the way along the house, joined it to the drain and then to the drain that runs out into the street. It has worked perfectly.
Re: Side of house drainage issues3
Nov 09, 2011 3:31 pm
it was like this prior to putting the drain and pipes in. We have since paved under this side patio, never gets wet.
Re: Side of house drainage issues4
Nov 15, 2011 10:16 pm
Thanks for the info. I think the ag pipe solution too..does everyone think this is the best idea?
how do I work out how big ag pipe is needed? does it need a sock over it with clay soil or not? How deep/big trench and how do I work out the gravel below/around/above the pipe and how much/high does the gravel go?
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