Do you need drainage on each side of the house?

[oasis1frog]

House with bad drainage. Do you need a drainage pipe on 2/each side ? Won't rainwater just go straight down the soil, so how does water not directly above the pipe got channeled into the pipe ?

[Jason]

Welcome to the Bunnings Workshop community @oasis1frog. We're pleased to have you join us and look forward to reading more about all your projects and plans. 

In order for our ever-helpful community members to share their advice with you, I suspect they will need a lot more information about your house and its current drainage. Perhaps you might like to start by sharing some images of the areas where you find flooding is an issue, and what drainage and guttering you currently have. Please let us know if you need a hand uploading photos. 

All the best,

Jason

[EricL]

Hello @oasis1frog 

Thank you for sharing your question about putting drainage at the side of your house. Draincoil comes in two versions slotted and unslotted. It's the slotted version that allows water to flow inside the pipe and redirect it to towards the drain.

This type of drainpipe is used in French drains where a channel is dug in the soil and gravel is placed at the bottom of the channel. The draincoil is then placed on top of the gravel, which is then covered with more gravel before being covered with geofabric and topsoil. 

You also have the option of using the Everhard 3m EasyDRAIN Polymer Grate And Prejoined Channel. This is a straightforward drain that catches and channels any water that flows into it towards the drain. In order to prevent the drain channel from tilting it needs to be anchored with cement.

Here is a handy step-by-step guide: How to install garden drainage by @Adam_W 

Once we see the pictures of your house, we'll be able to offer you a more comprehensive recommendation.

If you have any other questions we can help with, please let us know.

Eric

[oasis1frog]

Thanks. The post probably more a noob drainage question : how does laying a 200mm pipe can collect all the surface rainwater ? eg. in the picture how does surface water from either side of the pipe, x & y, go into the pipe instead of straight down, if not the yard still soggy ?

[EricL]

Hi @oasis1frog 

When water gathers on the surface of the soil it will sink down into the area of least resistance. This would be the gravel surface, and as water passes through it will reach the slotted pipe. The water in the pipe now gets directed towards the exit. It's important to remember that the channel that you dig for the drain coil will have a fall.

A fall can also be defined as a slope that has been applied to the channel that has been dug in the soil. Which is why the water flows down a draincoil.

If you need further assistance, please let me know.

Eric

[TheHandySqirrel]

Hi @oasis1frog,

as @EricL and @Jason have already pointed out, drainage is all about fall. A French drain uses gravity to collect water in a depression, but in our urban areas we usually don't have enough space for this. Hence we need to use additional structures to direct surface water into drains.

A very common such structure are retaining walls where you'd bury the drain at the foot of the wall and connect it to your stormwater drain system. There's no need for this wall to be tall, some solutions are just one step high.

It would be helpful to know how your ground falls in your drawing. Does it generally fall right-to-left or left-to-right? Or is your drain already located in a depression?

What helped me a lot was watching videos on YouTube which have been uploaded by professionals working in the area.

[oasis1frog]

Thank you guys. A family member just bought a house with poor drainage, doing a bit of research at the moment.

[MitchellMc]

Shout out if you have further questions @oasis1frog.

Mitchell