Watering times

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Davekstl

May 10, 2017 22:41

When I set a watering time example 20 minutes, is this the 100% time required in August or is this the time for May? So in August it will increase. Where is the baseline for the setting?

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  RainMachine Nicholas May 13, 2017 12:01

  The watering times that you set for a program, are for a normal summer day (usually August in northern hemisphere). Both custom and suggested are related to summer day. 

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  Davekstl May 17, 2017 17:25

  Ok....I am new to your system, thus all of the questions. I spend a great deal of money and water taking care of an acre, that is why I want to move from the existing system to your HD-12,  I am watching the HD-12, but it is not hooked up to the valves.

  So in the zipcode for St Louis 63131, July\August is the 100% normal day.  So I set my Zone 1 at 20 minutes. That was the July Auguts 100% mark. But watering on May 14 was 104% temp was 86, May 15th watering 111%, temp was 90, May 16th watering 110% temp 90

  Shouldn't the watering be no higher than 100%, not higher?

  I am not sure if I am setting the initial watering times correctly.

   

  May	56.6F	76.5F
  Jun	65.9F	85.3F
  Jul	70.6F	89.8F
  Aug	68.6F	87.9F

   

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  RainMachine Nicholas May 18, 2017 09:09

  Hi,

  Our "summer" base values are calculated over a interval of 30 years moving averages. If you go to Web UI Setting > Weather > Weather Services Comparison , click on ET tab

  and you should see 2 lines (one blue and one red). The blue one is our "summer" evapo-transpiration reference value. Check how close the red line (your current computed evapo-transpiration) is to the blue line (or above). 

  Also for evapo-transpiratio not only MAX temperature matters. A big impact is the difference between MAX and MIN, relative humidity and wind.

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  Davekstl May 18, 2017 12:28

  I am posting this graph for training purposes (me), maybe you can explain.  Also based on your response there will be times that the watering will exceed the July\August settings.

  Thanks - Dave

  

   

   

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  RainMachine Nicholas May 19, 2017 08:39

  Yes, if the evapo-transpiration calculations will exceed the average ET for a normal summer day in your region. 

  In that graph you can see how the red line goes over the blue line resulting in more than 100% irrigation. In other days there is less than summer irrigation.

   

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  Davekstl May 19, 2017 11:33

  It makes sense, thanks

  Dave

  Now just give me a way to change the spray\rotor head arc in the zone setting, and I will be a happy camper :-)

   

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