soakaway pit

pegdrums

Hi.

I am taking delivery of a new shed in a month and want to dig a soakaway pit before it arrives.

The shed will be 12ft long and 10ft wide with a pitched roof. I will put gutters on each side. I plan to put a waterbury on each downpipe and when these are full the water will divert into the soakaway pit.

My question is what dimension should the soakaway pit?

Also Can I run downpipes straight into the ground and have another pipe joined underground to carry the water to the s.p?

Finally do you have any information or advice on the build up of the pit? I think I heard somewhere, large rubble/ stones followed by smaller stuff on top.

The area above the pit will be getting a long awaited patio so digging is gonna happen there anyway so seemed like a good place to choose.

Any thoughts/ advice are very welcomed
Cheers

Calahonda52

if digging a hole why not put in a proper rainwater harvesting tank with a pump rather than farting around with butts
https://www.met.ie/climate/available-data/monthly-data will give you the expected rainfall, just pick the station nearest to you and for simplicity use the plan are of the roof to estimate the annual volume
so lets say 4m by 3m by 1.5 = 18 cubic meters

listermint

Calahonda52 wrote: »

if digging a hole why not put in a proper rainwater harvesting tank with a pump rather than farting around with butts
https://www.met.ie/climate/available-data/monthly-data will give you the expected rainfall, just pick the station nearest to you and for simplicity use the plan are of the roof to estimate the annual volume
so lets say 4m by 3m by 1.5 = 18 cubic meters

Building a swimming pool

pegdrums

Calahonda52 wrote: »

if digging a hole why not put in a proper rainwater harvesting tank with a pump rather than farting around with butts
https://www.met.ie/climate/available-data/monthly-data will give you the expected rainfall, just pick the station nearest to you and for simplicity use the plan are of the roof to estimate the annual volume
so lets say 4m by 3m by 1.5 = 18 cubic meters

excellent idea but would be more expensive id imagine. there are loads of jobs getting done so this has to be kept cheap.

would 18 cubic metres be overkill for a soakaway?

How about the contents of the soakaway?

cruizer101

You can get crates to fill the soakaway like this
https://www.tanksdirect.ie/products/graf-ecobloc-flex-attenuation-soakaway-crate?variant=32434720374859&currency=EUR&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&utm_campaign=gs-2020-12-17&utm_source=google&utm_medium=smart_campaign

If you fill with stones at a guess less than 30% of volume will be available to fill with water, whereas with crates more or less all is available.

Regarding the volume, 18 cubic metres is massive you don't need that, I don't know what size you will need it would depend on you soil and how well it drains.

pegdrums

cheers for that.
Yea soil drains pretty well, its never been sodden or waterlogged.

I'll have a think about the tanks, might even find a second hand one

pegdrums

Apologies, just clicked the link now. They aren't tanks at all!! They are a great idea

CodeJACK

How did you get on with the soakaway build? I need to install once myself as the garden gets water logged but two builders have told me not to bother and to just use a small rock fill in the affected area and apparently water throughout the garden will find its way there lol.

Any recommendations for a competent land drainage builder?

Something like this:

https://www.youtube.com/watch?v=6rmehFi0frk

hesker

I installed the crate system for a 6x4m shed about 4 years ago. Has worked perfectly. You still need to do a soak test obviously when you have the pit dug.

pegdrums

https://www.boards.ie/discussion/comment/117762464#Comment_117762464

hey, sorry for delay.

soak pit went great. as i said my shed is 12 x 10. I installed gutters that run in to 1 down pipe which runs in to the soak pit. I dug a hole over a metre cubed and back filled it with rubble from a shed I demolished.

Rubble varied in size and i just fecked in random layers of gravel. On top there are several incjes of soil and then patio slabs. Slabs are temporary.

Its seen a good few heavy showers and endless days of cork drizzle and is fine.

i'll try post a few pics

pegdrums

20210714_195705.jpg

20210714_195738.jpg

20210715_170428.jpg

here ya go