Covering Karachi's Nehr-i-Khayyam poses risk of urban flooding: experts

• Clifton residents, environmentalists stage rally to protest construction at key waterway • Demand suspension of work until EIA is conducted and project details are made public KARACHI: Expressing concern over construction at Nehr-i-Khayyam, an open drain in Clifton’s Block 5, residents and environmentalists from across the city held an awareness walk on Sunday, fearing that covering the drain would reduce its width and pave the way for “commercial activity”. Holding placards with messages such as “Commercial use of Nehr-i-Khayyam not accepted” and “Stop concreting drains, restore…