Quantification of annual sediment deposits for sustainable sand management in Aghanashini river estuary

Sedimentation involving the process of silt transport also carries nutrients from upstream to downstream of a river/stream. Sand being one of the important fraction of these sediments is extracted in order to cater infrastructural/housing needs in the region. This communication is based on field research in the Aghanshini river basin, west coast of India. Silt yield in the river basin and the sedimentation rate assessed using empirical techniques supplemented with field quantifications using soundings (SONAR), show the sediment yield of 1105–1367 kilo cum per year and deposition of sediment of 61 (2016) to 71 (2015) cm. Quantifications of extractions at five locations, reveal of over exploitation of sand to an extent of 30% with damages to the breeding ground of fishes, reduced productivity of bivalves, etc., which has affected dependent people's livelihood. This study provides vital insights towards sustainable sand harvesting through stringent management practices. [Display omitted] •Sand constitutes an important abiotic component in aquatic ecosystems.•Soil erosion aggravates with land use changes in the catchment.•Sediment yield of 1105–1367 kilo cum/year and deposit ranges from 61–71 cm/year.•Nearly 30% over exploitation of sand threatening sustainability.•Overexploitation damaged fish breeding ground affecting productivity and livelihood.