Papa hoʻoheheʻe paʻa
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Papa Waiwai Pila
Hana ʻia ka papa wai wai me ka polystyrene (HIPS) a i ʻole polyethylene (HDPE) ma ke ʻano he kumu. I ke kaʻina hana, hoʻopaʻa ʻia ka pepa plastik e hana i kahi paepae puka. Ma kēia ʻano, hana ʻia kahi papa wai.
Ua kapa ʻia ʻo ia ka concave-convex drainage plate, drainage protection plate, garage roof drainage plate, drainage plate, etc. I mea e hōʻoia ai e hiki ke hoʻokuʻu ʻia ka wai nui ma luna o ka hale kaʻa ma hope o ka hoʻopiha ʻana. Hiki ke hoʻohana ʻia no ka hoʻoheheʻe tunnel.