A bushe da kyau
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Busasshiyar rijiya ko busasshiyar rijiyar ƙasa ce da ke zubar da ruwan da ba'a so, yawanci magudanar ruwa da ruwan guguwa, a wasu lokutan ruwan toka ko ruwan da ake amfani da shi a cikin famfon zafi na cikin ƙasa . Tsari ne da ake ci da nauyi, tsarin karkashin kasa a tsaye wanda zai iya kama ruwan saman daga saman da ba zai iya jurewa ba, sannan a adana shi kuma a hankali kutsa cikin ruwa a cikin magudanar ruwa .
Irin wannan tsarin kuma ana kiransa da matacciyar rijiya, mai shayarwa da kyau, rijiya mara kyau da ramin jiƙa ko ramin jiƙa a cikin Burtaniya ko ramin jiƙa ko ramin jiƙa a Ostiraliya.