Iimpawu kunye neemodeli ezahlukeneyo zinemisebenzi eyahlukileyo.
1. Ezinye zizibane zenkungu ezidityanisiweyo, kwaye isigqubuthelo sesibane senkungu senzelwe ukuhombisa kuphela.
2. Ezinye iintlobo zezibane zenkungu ziqhagamshelwe nezixhobo zesithuthi ngesigqubuthelo sesibane senkungu. Kukho isigqubuthelo sesibane senkungu esinomngxuma emva kwesigqubuthelo sesibane senkungu ukuze sigqunywe.
Isibane senkungu sifakwa ngaphambili emotweni, singaphantsi kancinci kunesibane sentloko, kwaye sisetyenziselwa ukukhanyisa indlela xa uqhuba xa imvula inetha kwaye inenkungu. Ngenxa yokungabonakali kakuhle kwiintsuku ezinenkungu, umgca wokubona komqhubi ulinganiselwe. Ukukhanya kunokunyusa umgama wokubaleka, ingakumbi ukungena kokukhanya kwesibane esityheli esichasene nenkungu, esinokuphucula ukubonakala phakathi komqhubi kunye nabathathi-nxaxheba bezithuthi ezikufutshane, ukuze izithuthi ezingenayo kunye nabahambi ngeenyawo bakwazi ukufumana omnye komnye mgama.