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

[Jason Holstine]

I believe the calc is = every square foot of roof surface gives one gallon
of water for every 1/4² of rainfall.


On 2/15/11 8:14 PM, "Erin Rasmussen" <erin at trmiles.com> wrote:

> The soil is clay, it absorbs water very slowly, so either it is saturated, and
> sheets off all the nutrients I just added to it, or it percs slowly into the
> ground. I am hoping to collect it temporarily into rain-gardens, catchment,
> etc  so I can get it to go where I want it to in winter, and keep some of it
> around for the 1/3 of the year when it doesn't rain.
>  
> Erin 
>  
> 
> From: greenbuilding-bounces at lists.bioenergylists.org
> [mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of Reuben
> Deumling
> Sent: Tuesday, February 15, 2011 5:03 PM
> To: Green Building
> Subject: Re: [Greenbuilding] quick tools for calculating rainwater run-off?
>  
> 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
>  
> 
> _______________________________________________
> Greenbuilding mailing list
> to Send a Message to the list, use the email address
> Greenbuilding at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergy
> lists.org
>  
> 
> 
> _______________________________________________
> Greenbuilding mailing list
> to Send a Message to the list, use the email address
> Greenbuilding at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergy
> lists.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/attachments/20110215/af3be733/attachment.html>