projectsriver=<FONT FACE="Arial" SIZE="12"><b>Sarawak River Salinity Barrier</b></font><br>The water supply intakes to Kuching, the capital city of Sarawak, Malaysia, are located on the Sarawak River near the upper end of tidal influence. Operation of a downstream barrier has increased upstream salinity levels, which can lead to the drawing of saline water into the intakes during low flow periods. A salinity barrier has been designed by Geotech Consulting Ltd to prevent this occurrence. Although a low structure with 1.5m head across it, the design has had to allow for 8m submergence in floods and rock of variable depth and quality below the site. A circular sheet pile structure is being used to facilitate construction without large temporary works. The weir incorporates both a portage ramp and lock for river navigation. Geotech Consulting has done the overall layout and detailed design of the weir and abutments and a local consultant is responsible for the navigation structures, tender and contract work.