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Home Forums General Discussion 11,000 gallons in 3 days

This topic contains 3 replies, has 3 voices, and was last updated by  WrethaOffGrid 4 years, 9 months ago.

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    How to make a huge rainwater cistern

    We had less than 1″ of rain between October 2012 and July 2013. But, now that July is here, the rain season has started, which means that it is Spring, here!

    We received about 7″ of rain in the last 72 hours. The rainwater cisterns are filling up! We caught 11,000 gallons during this period, which is enough to keep our garden watered for an entire year.

    Here’s our roof potential:
    House Roof + tank roofs – ~1,000 gallons of water per inch of rain.
    Barn + barn tank – 500 gallons of water per inch of rain.
    Sheds and assorted tanks – 150 gallons per inch of rain.

    TOTAL – 1650 gallons per inch of rain

    For capacity, we have the following:
    House cisterns – 14,500 gallons + new tank(7,000 gallons, under construction)
    Barn Tank – 7,000 gallons
    Shed tanks – 1,500 gallons
    Swimming pool – 2,000 gallons

    TOTAL – 32,000 gallons

    So, we need about 20 inches of rain to fill everything, if they start empty.

    BUT, our water accounts are about:
    House Tanks – 6,000 gallons
    Swimming pool – 1,000 gallons
    Barn tank – 1,500 gallons
    Shed tanks – 1,000 gallons

    TOTAL – 9,500 gallons

    So, our current capacity is 32,000 – 9,500 gallons – 22,500 gallons, which translates to about 14 inches of rain.

    We typically receive about 25 inches per year, but we’ve already had about 10″ this year (7″ in the past 3 days).  We can reasonably expect 15 inches of rain between now and the end of October.



    Looks good and handy! Tell me about your tank in the picture… what is it made of? Is it a homemade or partially homemade tank? The top? How do you access this water once it’s in the tank?





    What a great setup!

    I too, would like to know more about the construction of your tanks.



    Oops Valcreations, I just noticed the **link** in the post :)

    There are wonderful instructions there. Here is the link so it’s easy to find, even for someone like me :)

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