Izinto ezisezingeni eliphezulu: I-drain yaphansi yenziwe ngensimbi engagqwali. Insimbi engagqwali inamandla amakhulu nokuqina, ukugqwala nokumelana nokugqwala.

I-drainage esheshayo esheshayo: I-outlet enkulu yobubanzi yanelisa isidingo sakho sokuqalisa isivinini. Ukukhipha amanzi ngokushesha kugcina igumbi lomile.

Ukufakwa kalula: Isivalo esikhiphekayo kulula ukusiphakamisa ukuze sifakwe nokuhlanza.