● Amagwiritsidwa ntchito makamaka ngati magawo abwino kwambiri opangira pamwamba ndi mkati mwa khoma ndi denga, zipangizo zopangira madzi zopanda madzi.

● Kuthamanga kwambiri kwamphamvu, kukana dzimbiri, kunyowa mosavuta ndi asphalt, ndi zina zotero.

● Minofu yotsekereza yosalowa madzi yopangidwa ndi chigawochi ndi yosavuta kusweka, kukalamba ndi kuola. Ubwino wina wa minofu yofolerera yosalowa madzi ndi makulidwe a yunifolomu, kuchedwa kwa lawi, kufanana kwabwino, nyengo yabwino komanso kukana kutayikira.

● Chida chogwirizana ndi chilengedwe chopangidwa ndi galasi lodulidwa la fiber ndi kunyowa.