Hey, leachy!
SANParks have at first replied that closing Sunset Dam is part of the reduction in artificial waterpoints, as per blowing up the boreholes etc.
Firstly, I don't know if this is the actual reason, as the dam in question is an emergency water reserve for LS camp...or was...
Secondly, letting it die is pointless, as the perennial river is a few metres away...it will have no impact whatsoever other than killing a zillion fish and other aquatic animals, and forcing a number of hippo and croc to seek residence elsewhere, probably resulting in more deaths...

Please check Needs Attention pre-booking: https://africawild-forum.com/viewtopic.php?f=322&t=596