Evaporation

Discussion in 'Water Features' started by Niagara Falls, Aug 5, 2011.

  1. Niagara Falls

    Niagara Falls LawnSite Member
    Posts: 149

    We are in the midst of a very long heat wave and not much rain. When it does come down it rains cats and dogs.

    I'm really amazed at the evaporation happening in my pond. I know it's not leaking.....been through that already. I'm adding about 100 gallons a day to a 1500 gallon feature.

    I'm wondering how others are dealing with it, as the whole eastern part of the continent is in the same situation.
     
  2. tadpole

    tadpole LawnSite Bronze Member
    Posts: 1,216

    Just looked at the Brockville, Ont. weather report. It says the current temperature is 29C/84F. Hardly a heat wave IMO. But to your question.

    How does that 100 gallon loss translate into inches or millimeters lost?
    What is the total surface area of your pond? Have you added additional aquatic plants since the last photo you posted?

    Here in the Florida panhandle, we have been running heat indices of 105+F most every day since mid-May. Actual daytime highs have been consistently in the 90F - 95F range for this same period, esxcept during the rare periods it has rained. My pond, as well as all the ponds that I service, have been running the usual evaporation rate for this time of year, usually less than .25 inch/day; rarely up to .50 inch/day.

    The USDA research station at Geneva, NY reported an average Pan Evaporation rate of .24 inch/day for week ending July 30, 2011. This is basically just across the Lake from you, isn't it?
     
  3. STL Ponds and Waterfalls

    STL Ponds and Waterfalls LawnSite Bronze Member
    Posts: 1,177

    I'm with Tadpole but we are in the midwest and the lovely weather has been in the 100's with heat indexes of 105-108 or more on a few day's fourth hottest July on record. Anyway my pond is usually losing about 20-25 gallons a day in a 1000 gallon pond that is 18X20 with your typical amount of splash.
     
  4. tadpole

    tadpole LawnSite Bronze Member
    Posts: 1,216

    That;s an advantage of high heat indicess, if one can imagine heat indices of 105+ having any advantage. Heat indices are indicative of high humidity levels which suppress evaporation rates. Without that humidity the evaporation rates would skyrocket, as noted by some places in Texas that are reporting evaporation rates of about an inch/day. THAT, my friends, is a lot of water.
     
  5. STL Ponds and Waterfalls

    STL Ponds and Waterfalls LawnSite Bronze Member
    Posts: 1,177

    I can't recall the place but I saw some lakefront properties that are all dried up. It's really sick to see docks that are 15 feet tall with a dried up lake bottom.
     
  6. tadpole

    tadpole LawnSite Bronze Member
    Posts: 1,216

    Worst drought since the 'Dust Bowl' in the 1930's.
     
  7. Niagara Falls

    Niagara Falls LawnSite Member
    Posts: 149

    The water evaporation is about 1/4- 1/2" per day depending on the temperature. We averaged the mid 80's in July, and had sun most of each day, and my pond is in direct sun from sun up until sun down.
    To answer tadpole, my square footage is about 290.

    As a side note, the guy that looks after the pool in our boat marina, says he has never had to add water in the amounts he has in the 5+ years he's been there.

    We are going into a bit of a cooling trend in the next week, so I'm hoping the water drop is much less.......I hope it;s not leaking...I've had enough of that scenario.
     
  8. tadpole

    tadpole LawnSite Bronze Member
    Posts: 1,216

    .25 inch/day for 290 Sq.ft. surface area works out to about 88 gallons per day, so you are in the ball park as far as evaporation loss.
     

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