Sediment Transport Modeling in The Katingan I Tidal Irrigation, Central Kalimantan

The utilization of swamp land as productive rice fields is to support national food security and the local economy. One of which is carried out through the Katingan I tidal swamp irrigation rehabilitation project. In the Katingan I tidal swamp irrigation area, sedimentation problems occurred in the channels. The Sedimentation reduces the water flow capacity in primary and secondary canals as a water supply for agricultural fields which can have an impact on decreasing paddy production. This study was conducted to model sediment using HEC-RAS 6.4.1 software and to identify the areas affected by sedimentation in the Katingan I tidal swamp irrigation canals. Data collection methods included direct observation of tidal heights over a one-month observation period on the Katingan River. The study results show that the lower right primary canal 13 (PBKn 13) has the highest sediment volume and the invert channel increased by 1.81 % per month. The recommendations to address the issue include rehabilitation and normalization of the canal to control the impact of sedimentations.