So five thousand liters&#x2F;hr<p>OK then as a crude engineering estimate to one sig fig it takes one kilowatt-hour to boil away a liter of water (Am I mis-remembering? That seems extremely low), and the sun is up half the time, and one kilowatt for one hour is exactly one kilowatt-hour.  Also we&#x27;ll assume lawns are 100% thermodynamic black bodies turning all sunlight into heat (LOL).  At noon, to one sig fig, you get a hundred watts of solar energy per sq foot.  One acre is about fifty thousand square feet to one sig fig.  Finally we&#x27;ll assume the yard is not slowly sinking underneath a freshwater lake... over any give 24 hour period every liter must evaporate or the inhabitants will have to learn to swim.<p>So the lawn (or whatever) is turning ten thousand kilowatts of solar energy into water vapor.<p>To get ten thousand kilowatts at noon would take about about a hundred thousand square feet, or about two acres.  At noon.<p>I only live on a one acre suburban lot, at that continuous flow rate, assuming no runoff, the water level would rise rather rapidly over a couple weeks.<p>It seems believable on a five acre lot but from time to time its going to get rather swampy.  Honestly I&#x27;d look for a ten acre lot.<p>This is assuming no runoff (unlikely) and no electrical heat (like a Jacuzzi heated by natgas boiling away water continuously).  This is also assuming no wind beyond blowing steam away.<p>A &quot;two or so acre&quot; artificial lake would be a quite believable evaporation rate.  Put another way, were you to find a depression in the dirt, and turn on a hose at that flow rate, the surface area of the puddle would stop growing somewhere around a couple acres.<p>The numbers are &quot;engineering believable&quot;.