[Greenbuilding] quick tools for calculating rainwater run-off?

[Reuben Deumling]

I just made up my own spreadsheet calculator. If you know the area of the
roof flattened out (not counting the pitches) you just need to multiply that
area by the inches of rain that fall, and using some conversion figures to
get cubic inches into cubic feet (1728) and cubic feet into gallons (7.48)
you're good to go.
Beyond the roof area are you saying that your soils don't absorb the rain?
Once its on the ground I don't think capturing and storing it is going to
very rewarding unless you live on some really steep land, which you said you
didn't. What are you planning to do with the water you've collected?

By drainage do you mean something like a drywell?

On Tue, Feb 15, 2011 at 4:57 PM, Erin Rasmussen <erin at trmiles.com> wrote:

> Boy, I've been diligently insulating at my house for the last couple of
> weeks, and thinking of you folks for inspiration only to find that in my
> absence you've been talking about sending Martha Stewart to outer space. ;-)
>
>
>
>
> I live in a low spot, and we've got rainy conditions for 2/3 of the year.
> Does anyone have any good cheat sheets for figuring out how much rain water
> (in gallons) are coming off my roof, lawn and land? I've got to install some
> type of additional drainage system and i'd like to add rainwater catchment -
> but I'm not sure what scale I should be looking at.
>
>
>
> Total roof area is about 1000 square feet (including the garage) and it's
> about 0.15 acre but I should calculate for 0.25 acre to include run-off from
> the neighbors.  Daily rainfall is typically 0.5-1 inch but it's not unusual
> to have 3-4 inches in a 2 day period.
>
>
>
> Erin Rasmussen
>
> TR Miles Techical Consultants Inc.
>
> and BioEnergy Discussion Lists
>
> erin at trmiles.com
>
>
>
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