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Need drainage advice for water pooling in patio area

I have a problem with water holding at the end of my patio and was just wondering what the best and easiest approach would be to get rid of the water.i have cleared the area to possibly lay down some Ag pipe but my question is, Is there any chance of running ag pipe and connecting it to the down pipe coming from the roof? Or can I run Everhard stormwater drains at the end of the patio and connect that to the down pipe and connect the Ag pipe from the yard to storm water drains ? Or will I have to run a Ag pipe on its own to the front not connecting to any existing pipes.

I've been on countless threads with no idea still. Any help would be appreciated .

Thanks in advance

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Comments

EricL

Hello @hall212 ,

Welcome to the Bunnings Workshop community. It’s fantastic that you've joined us. Thank you for sharing your question about storm water drains with the community.

The methods you've mentioned to divert your water are all possible. Among those you've listed, I recommend using the Everhard EasyDRAIN Polymer Grate & 1m Channel it is easy to install and maintain. Should debris block the channel, you don’t need to dig or use specialist tools to access the problem. Simply remove the top cover grate of the channel and remove the blockage. The Everhard EasyDRAIN is UV stable, strong and can take a lot of abuse.

The Everhard EasyDRAIN is plumbing-friendly and has moulded access that allows you to link to existing drain systems. Please plan carefully and make sure your plumbing parts fit your current storm drains before purchasing the Everhard EasyDRAIN. I suggest linking the Everhard EasyDRAIN to the current exit of your down pipe. If the fittings you currently have are standard, it should be easy enough to match and connect to the current drain.

Let me tag my experienced colleague @MitchellMc to see if he could share his thoughts on your project when he is back on the site tomorrow. Other experienced community members @JDE and @Adam_W might also like to have input on your plans.

Please keep us updated and we look forward to your progress with the storm water drains. Feel free to post again if you need more information or assistance about your project.

Eric

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/13859#Comment_13859

Hi @hall212,

It sounds like @EricL has got everything covered. I suspect a stormwater pit in the middle of that area would be a good solution, but that doesn't work well with your plans to pave over the space.

You might find it best to run the lengths of Everhard EasyDRAIN Polymer Grate & 1m Channel along the pool fence. You can then lay the pavers with a slight fall away from the house towards the drain. That way, the water runs across the pavers towards the drain and then gets transferred through your pipes directly to that gutter downpipe.

Please let us know if you have any questions.

Mitchell

Adam_W

Hi @hall212
Okay, nice puddles...
You need to think of drainage in two ways;

- water collection - surface drains etc.
- water transfer - moving it somewhere else.
Without getting both of these right you will never fix a drainage problem.
First I'll just unpack a few of the things you mentioned...
Connecting to existing storm-water or downpipes.
Unless you really, really know what you are doing I would not recommend this at all. A couple of reasons why.

- If you do not create a suitable junction you may end up with leaks underground and a very boggy area, or underground erosion leading to minor 'sink holes', over time.
- If not correctly angled & connected the existing storm-water may back-flow into you new pipe and you end up with water flooding out of any new drains you've added during heavy rain.
Running ag pipe.
Not sure where your water is coming from but it looks to be surface run-off to me. Ag pipes are designed to deal with water that is draining into the soil or a water table that is rising up. I suspect that if you went to the trouble of digging in an ag pipe it actually wouldn't do very much at all as it won't capture surface water fast enough to be a fix unless you plan to have an exposed gravel trench or French style drain. This is where you line the bed of a trench with gravel, lay your ag pipe, back fill with gravel all the way to the surface and run-off then falls into the gravel. Very effective but prone to clogging with silt over time.

So... what to do...
I would be looking at some surface box drains such as the Everhard ones you mentioned along the edge of the slab. You'll then need to profile the soil to pitch towards this. Remember that your drain needs fall for water to run so if the slab does not have fall then maybe set the drain a little away from the slab edge so you don't have a conspicuous drop away of drain height Vs slab height.
You need to drain the water to somewhere which again needs to have suitable fall to run. Using the non-slotted ag pipe (flexi pipe) can be the easiest way to do this and this pipe is easier to install and more tolerant of ground movement than rigid storm-water pipes. If you have a storm-water pit it could run to this otherwise best to have it run as an independent line discharging to a suitable location (note... it is illegal to drain water towards a neighbours boundary...)
I think that's about it apart from one other thing... where is the water coming from? Sometimes the best drainage solution is to stop the problem closer to it's source - deal with the cause rather than the symptom.Hope this is of some help & please fire away with any more questions.

Jason

Hi @hall212,

Just thought I'd check in to see how you are going with your drainage project. It was great to see you receive such expert advice. Now you've had some time to digest it, please let us know if we can assist further. We're here to help.

Welcome to the Bunnings Workshop community. We're really glad to have you join us and look forward to reading more about your projects and plans for around the house and garden.

Jason

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