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>When it comes to above ground surface irrigation, the >water is measured in inches, just like rainfall. The >plant's requirement of x number of inches will >determine how much has to be made up for lack of >rainfall. There are all sorts of calculators on the >web as to how much water turf needs, but observation I >have found is best. > >Around here, topsoil (which is where grass has it's >roots) tends to dry out in two to three days. So if >there is no rain in those days, irrigation is >necessary. Observation is a good indicator. If you >observe wilting, such as leaving foot prints when >walked across, then it is time to water. > >I have heard that turf needs at least 3/4" of water >before it gets to the roots adequately, but that would >depend on the type of soil as to how fast that happens. > >Manufacturer's will list on their website how many >inches a sprinkler head will produce at a particular >pressure, but even more accurate is the "can method" >where you place some cans in the grass, run the >sprinklers for an hour, then measure how many inches >are in the can. > >The biggest problem drip systems have with wells is >sand tends to jam the emitters and wells tend to have >more sand than city water, although there is some in >my city water. There are filters made to eliminate the >sand. The ones I am familiar with are called "spin >down" filters that have a "sediment trapper" in them. >The way this works is that large stuff will be spun >out so it doesn't clog the screen or polyester filter. > >One company that makes these is Rusco: ><a rel=nofollow target=_blank >href="http://www.rusco.com/">http://www.rusco.com/</a> ><a rel=nofollow target=_blank >href="http://www.rusco.com/html/whybetter.html">http:// >www.rusco.com/html/whybetter.html</a> > >You have to get a pretty small screen for drip. >Something along the same size as if you ran a poultry >farm watering system. ><a rel=nofollow target=_blank >href="http://www.rusco.com/html/applications.html">http >://www.rusco.com/html/applications.html</a>

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