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Papa Doug buys Rhode Island estate

Dear Dan: This is getting kinda convoluted, but to recap: The annual evapotranspiration (ETo) rate for the desert is around 6 feet, or 6 acre-feet (see http://www.cimis.water.ca.gov/App_Themes/images/e… ). That's the minimum required to keep grass green there in an average year. For ever acre (43,560 square feet) that's 6 x 43,560 = 261,360 cubic feet per acre x 7.48 gallons per cubic foot = 1,954,973 (pretty close to two million) gallons per acre per year. Multiply that times the number of acres of grass and you will get the MINIMUM required to keep the grass green. Pick any multiplier you want to account for the waste/over-irrigation factor. I have used 2.5 which I recall from studies I read over 40 years ago, so there's no link that I know of, but I'm willing to stand corrected regarding the waste factor on the basis of any new scientific data or actual measurements. However, any claim of significantly less than a couple of million gallons per acre per year would be suspect, as those figures are right out of the CIMIS website and the relationship of the volumes that are standard measures. If, for example, an "average" golf course was, say 200 acres, the annual MINIMUM (with a zero waste or over-irrigation factor) would be around 390,994,560 gallons per 200 acres per year. With a waste or over-irrigation factor of 2.5, that 200 acres would require 977,486,400 (pretty close to a billion) gallons per year. I use this example, because you haven't said how big or small the golf course you cite is. The 16 includes the error or over-irrigation factor of 2.5. Actually 2.5 x 6 = 15, so I stand corrected. I had once read that 16 feet was a common rate of application for typical landscaping of the day (1960's or '70's) and I used 2.5 to be conservative. Please refute any of the above and correct me with a clear comparison of the bad figures and the good figures. I think the annual basis is more fair than the daily basis, and is more standard practice, because there is some variation in ETo from day to day, season to season. Unless the maintenance people never change their irrigation controllers (which happens a lot). Again, the devil is in the details, but these are the basics with which any analysis must start.
— August 1, 2015 10:02 p.m.

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4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
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