evaporation from ground (undersoil heated sportsturf)

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Hi, I'm working on a project which consists to store hot water in an insulated tank to supply an undersoil sportsturf heating system.

I think the most important part of heatlosses will be produced by evaporation from the ground. I need to keep the roots temperature around 8°C (46,4°F) during normal periods to help the grass to grow up (and above 0°C (32°F) during freezing weather.

Does somebody on unmethours had experienced such calculation .

The substrate of the field is made of cork chips and polyolefine fibers, so it's a light soil.

Many thanks for your help.

Best regards.

Mark Jaouen