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Thread: Stormwater - minimum fall?
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22nd November 2005, 06:56 PM #1
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Stormwater - minimum fall?
All,
After searching the net for about an hour I thought I'd post the question here....
I am looking to install a water tank under the deck and connect to the 2 downpipes at either end of the deck.
Currently the pipes run thru the deck and into the ground.
My plan is to cut them off and run them across under the bearers to the top of the tank (about 9m away).
What is the minimum fall I need to have on the pipes to ensure a good flow?
Cheers
Geoff
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22nd November 2005 06:56 PM # ADSGoogle Adsense Advertisement
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22nd November 2005, 07:02 PM #2
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22nd November 2005, 07:04 PM #3
Cool dude
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When I did the shed at my last house I was advised to have at least 5mm of fall for every metre of pipe/gutter.
Have a nice day - Cheers
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22nd November 2005, 07:06 PM #4
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Irrigation ditches in cotton fields have a fall of 1 foot to the mile.
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22nd November 2005, 07:15 PM #5
Drop Bear Master
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Currently having a sh!te fite with our council as our land is 3 metres lower than the drain, they still seem to think that water runs uphill, saga continues...
Stupidity kills. Absolute stupidity kills absolutely.
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22nd November 2005, 07:18 PM #6
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Love the new avatar.
Horse stops mid air, must be the council horse?
Al
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22nd November 2005, 07:22 PM #7
Drop Bear Master
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Few years ago, it did, I didn't, 8 cracked ribs, 1 broken wrist.
Horse suffered sore bum when I got home from hospital, re admitted, 1 broken foot.
(last one was a lie)Stupidity kills. Absolute stupidity kills absolutely.
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22nd November 2005, 07:41 PM #8
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Is that you on the horse?
I would have stopped too if I was the horse.
Al
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22nd November 2005, 08:02 PM #9
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22nd November 2005, 08:26 PM #10
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A fall of 1 in 100 is adequate in a closed pipe situation, in a larger pipe (250mm diameter) you could go to 1 in 200. In an open gutter, where litter such as leaves and dirt could get trapped it would be safe to allow more like 3 in 100.
Cheers
Justine
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23rd November 2005, 02:31 AM #11
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Have you given any thought to disposal if/when the tank fills up?
if you always do as you have always done, you will always get what you have always got
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23rd November 2005, 10:07 AM #12
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maglite,
The overflow is directed back into the stormwater channel...
Geoff
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23rd November 2005, 10:41 AM #13
dubadubadubaduba....
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People get carried away with this. If this section of pipe is below downpipes etc the 'head' of this water will push it through this section, even with reverse fall. To illustrate this better our last house had a syphon system: The kerb on the roadside was only about 1.5m below the guttering, but the pipe had to be about 1m below the kerb outlet as it was buried under the driveway. I sealed all joints, had an overflow on the downpipe, and it worked a treat. Note that the system is permanently full when not running.
That said, most inspectors like to see 'normal' pipes sloping towards the outlet. Put a 'turn of the bubble' on it if you can.The only way to get rid of a [Domino] temptation is to yield to it. Oscar Wilde
.....so go4it people!
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23rd November 2005, 06:40 PM #14
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The other answer is...... as much fall as you can practicaly get.
If thats all the fall you have....
Any thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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23rd November 2005, 06:47 PM #15
Drop Bear Master
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If it's likely to build up a retarding basin may be order of the day to save any problems.
Thanks Al, just because I'm 5'2" and 55kg you have to make fun of me
Stupidity kills. Absolute stupidity kills absolutely.
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