- The patio measures 17'W x 11'D for an area of 187 sq. ft. or 26,928 sq. in.
- The average rainfall in my zipcode (92866) is 12.6".
- 1 gallon is equal to 231 cu. in.
- If you take the roof area of 26,928 sq. in. multiplied by the average rainfall of 12.6" you get a whopping 339,293 cu. in. of annual water hitting that roof.
- Divide that by the 231 cu. in. in a gallon and you end up with a juicy 1,468.8 gallons a year off that one little patio cover!
Using the ~2/5" of rain in the last 48 hours, I can plug that into the formula and get 46 gallons which isn't too terribly off from the 35 gallons I claim to have collected. Factor in that I'm not collecting 100% of the runoff and I consider that to largely be a validation of the formula.
Based on that I think I may just rig up some tanks and gutters for next winter.
In other news, I harvested a couple handfulls of beans and they taste alright, nothing too exciting to be honest. I'm hoping the cool weather is contributing to bland flavors. I read that you should try to harvest everyday to keep the crop producing, so like a good student I'm doing as I'm told. The tomatoes that I put in the ground look quite healthy, they've perked up a bit and, now this could be in my head, look to be deeper green in color!!
2 comments:
Hi,
I found your blog on the GardenWeb blog roll list. Wow, great calculations. It's amazing how much water comes off the roof when it rains! I have two 55 gallon rain barrels and they fill up in a matter of minutes even during a light rain. Looking forward to seeing more from your gardens, I'll have to explore your blog more.
Amy
I was surprised too and really am thinking seriously about ways to collect as much as possible. I used the 35 gallons to water all my seedlings, lasted probably a week or so - not bad!
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