Update from Parks: Carol is correct - as part of the project to provide geothermal heating/cooling for the North Shore pool, a well is being dug and resulting water is being pumped into this fenced area. Once the well is complete, the water will be pumped out, the fencing removed, and the area will be re-sodded. This should be completed over the next few weeks. Thanks for the question.

http://www.stpete.org/news/2014/1-30-2014_north_shore_aquatic_complex_to_upgrade_using_geothermal_and_solar_technologies.asp