Spiral pombi inoshandiswa zvakanyanya mugasi rechisikigo, peturu, indasitiri yemakemikari, indasitiri yemagetsi, indasitiri yekudziya, indasitiri yemvura uye yekudhiraivha, kupisa kwemhepo, hydropower kumanikidza simbi pombi, simba rinopisa, mvura uye mamwe marefu ekufambisa pombi uye murwi, dredging, mabhiriji, steelstr...
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