I just caused myself severe brain damage by Googling for 'flow rates through pipes' and produced awful flashbacks to integration and differential equations. Both of which I thought I'd left behind years ago.
Where can I find - in simple terms - how to caclulate how much water a
40 mm waste pipe can pass in units that I can apply to the area of roof to be drained?This is is the situation:
I have a waterbut which, courtesy the previous owners, collects the water from my carport roof and the whole roof area of the back of the house. This water was distributed around front and rear gardens by a snakes nest of hosepipes which frequently blocked flooding the garage. I did away with the hoses and, temporarily (5 years ago!) fitted a submersible pump to shift the water, vai a delivery pipe over the roof of the garage, into the back garden out of harms way. On Sunday we had the mother of a thunderstorm accompanied by a power cut. Ooops! Garage nearly flooded.
My solution is to run a 40mm waste pipe from a collector in place of the waterbut through the garage and out to the back garden.
Why 40mm? That the size of the panel between the garage door and the wall of the garage (which is reinforced concrete).
I can fit 2 x 40mm pipes, i.e. one above the other but not 50mm.
TIA
Richard