Yankin Kula da Ruwa na Upper Vaal
Upper Vaal WMA, ko Upper Vaal Water Area (coded: 8), yanki ne na Gudanar da Ruwa wanda ya haɗa da manyan koguna masu kai komo: kamar Kogin Wilge, Kogin Liebenbergsvlei, Kogin Mooi da Kogin Vaal, kuma yana rufe madatsun ruwa masu kai komo:

 Boskop Dam Mooi River
 Grootdraai Dam Vaal River
 Klerkkraal Dam Mooi River
 Klipdrift Dam Loop Spruit
 Potchefstroom Dam Mooi River
 Saulsport Dam Liebenbergvlei
 Sterkfontein Dam Nuwejaar Spruit
 Wahala Dam Val River

Iyakoki 
Yankunan magudanan ruwa na uku C11 zuwa C13, C21 zuwa C23, da C81 zuwa C83.

Manazarta 

 Ilimin kimiyyar ruwa