Baseflow study of Sungai Chuau and Sungai Bisa, Putrajaya Wetland

The groundwater component in the form of baseflow in Sg. Chuau and Sg. Bisa sub-catchment within Putrajaya wetland during the low flow period was studied. Field investigations show that the alluvium deposits along Sg. Chuau compose more sand and gravel thus increase its hydraulic conductivity and groundwater discharge. Sg. Chuau could be classified as a baseflow river and the groundwater component maintain its flow during any dry period. The existence of this condition would guarantee the stream flow and maintaining the wetland ecosystem in the upper part of Putrajaya Wetland during the long dry period. Sg. Bisa, on the other hand is not a baseflow river and easily dry up.