As reported in the Nation, the Sindh environment minister, calling the mangroves the ‘Lungs’ of Indus delta, has said illegal cutting of mangrove trees, land encroachment and sewerage being dumped by Lyari river were the major threats. It is good he did not blame the dams for having reduced the flow below Kotri. Dams increase river flows rather than decrease it. The problem is that it is only during the three flood months that surplus water flows down to the Indus delta, while there is little or no flow in the remaining nine months. The surplus water needs to be stored in dams and the required dose released every month for year round protection of the Indus delta. The degradation of the Indus delta will continue if more dams are not built to increase water supply.

ENGR KHURSHID ANWER,

Lahore, April 19.