Maybe, a bit like other commentators you missed this section of HZ's reply, "Rashid Khan, regional director of the national Department of Water Affairs, rejected the request, saying “although the water situation is concerning, it is not yet at crisis level as has been widely reported; the lower levels in our dam is a concern we can do something about. We still have time for intervention”.

So tell us again; what did these / your / DWS "experts" say?  Then tell us what DWS have done; aside from nothing?