the sewage treatment plant in slavyansk-on kuban. water for sewage treatment in a small city. bright on the banks of water

banks beautiful bright building canal cane city cleaning concrete cre crime danger day dirt dirty ditch drain drone duck duckweed engineering environment flood flowing forbidden forest green groundwater hydro infrastructure kuban lake land landscape leaf natural nature outdoors plant quadrocopter rain reed scenic sedimentation sewage sewer slavyansk slavyanskkuban small splashing stream technology toxic treatment waste water