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Water management - rain bursts

W

Windows

Old Oak
Joined
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Cumbria & West Kent
Does anyone know of useful resources that discuss retro fitting properties for the new reality (in SE England at least) of intense rain bursts? Climate change has increased the frequency of sudden heavy downpours and I’m thinking about how to manage it.

For example, I’ve got a flat garage roof that gently slopes to a gutter on the short side at the back and the down pipe just exits into a flower bed. This worked for many years, but now with heavier rains the ground doesn’t absorb the water quickly enough. I’m trying to decide what to do about it.
 
I used SUDS advice from a website I've forgot to create a soaraway for my workshop build.

IMG_0726.JPGIMG_0738.JPGIMG_0740.JPGIMG_0742.JPG


It's now underneath my deck.
 
I have the problem that no soakaway works when the ground is saturated, no matter how big. In really wet times, mine fills up, backs up, then just adds to the pond that was the top half of the lawn.
 

Concrete Soakaway Manhole Rings - JDP

900mm - 3000mm concrete manhole chambers pre-drilled with 75mm holes to act as a soakaway chamber.
store.jdpipes.co.uk store.jdpipes.co.uk

I used these when i built my flats, takes the rainfall from the roof and 90m2 of block paving parking area, from memory they were 1200mm rings and total of 2400mm high. Ground is chalk so drains pretty well. Never had the lid off to see inside since it went in 20 years ago.
 
In order to get this right, I suspect it is pretty important to know where the water table is. In our land the water table is quite high. Soakaways don't do much if they penetrate the water table I imagine.
 
AJB Temple said:
In order to get this right, I suspect it is pretty important to know where the water table is. In our land the water table is quite high. Soakaways don't do much if they penetrate the water table I imagine.
Click to expand...
Hah...our water table at the moment is more water table-cloth
 
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