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| How Much Rainwater Can You Harvest? | |
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| Tweet Topic Started: Mar 28 2009, 09:55 AM (251 Views) | |
oldmarinesgt
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Mar 28 2009, 09:55 AM Post #1 |
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Here is a link to a handy little online calculator to figure out how much water you can harvest from a given amount of rain. You plug in the variables: length and with of the surface catchment area, amount of rainfall in inches, and what percent of the rainfall you are going to capture and it returns a number in gallons. Most catchment systems have a way of letting the first part of the rainfall run off to wash the dirt and bird droppings off the roof before routing it into your system so you dont want to put 100% into the equation. There is a simple little setup you can build that will do this automatically for you using just a pulley and bucket. Here is the link to the calculator: http://www.csgnetwork.com/rwcollectioncalc.html |
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| Loshali | Apr 23 2009, 09:10 PM Post #2 |
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Great site. People overlook the benefits of an in-ground cistern. I dont have one yet, but its definitely in my two year plan. Cement cistern, if possible, as plastic erodes. one of my customers was a 150-200 year old plantation, and I got the idea from them (although a little internet research brought up a ton of info, google 'cement in-ground cistern' ). Just off the kitchen was a 10 x 10 (approximate) cistern, not sure of the depth ( may be 10 ft for ease of figuring). Forease of multiplication, 10 x 10 square = 100 Ft, x 10' deep is 1,000 gallons at any given time. All this from runoff from the roof of the house. When I asked the custodian about it, he said they have to shut off the downspouts because it will overflow the cistern in a good hard two-day rain. I'll post more on this later. |
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| xolar | Apr 23 2009, 10:54 PM Post #3 |
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becareful on the ingrounds as I have seen a few failures when not done correctly |
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1:03 PM Jul 11