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I am trying to get a handle on how much water I need to keep an area watered for small vegetables, and for a small yard with ornamental plants.  I may be installing a 265 gallon tank, and possibly one or two 205 tanks.  My garden size is about 12′ by 12′; and my front yard is about 7′ by 12′.  I have looked up some measurements on line, but just wanted to check to see if you have some estimates or a good website to go to for the Bay Area weather, moisture and rain patterns.  Thanks,

Patty

Rainwater harvesting- general
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Hi Patty,

WaterWonk is a great website for plant water requirements and has lots of Bay Area info.

To give you a general idea, if you’re watering medium water use plants (like fruit trees, vegetables, etc.) you’ll need about 1/2 gallon per square foot of planted are per week, during the peak irrigation season.

Garden 12’x 12′ = 144 square feet would require around 74 gallons a week during the peak season (i.e. July).

Front yard 7′ x 12′ = 84 square feet would require around 56 gallons a week.

Probably not every square foot of your landscape is planted, but you can see how you’d do this rough calculation.

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That is so helpful and is consistent with some of the other calculations that I have done.  Thanks so much!

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