Open AccessWater Management Evaluation for Upgrading Tidal Irrigation System, Katingan, Kalimantan
Author(s) -
A. Khomaini Fauzan,
Budi Santoso Wignyosukarto,
Rachmad Jayadi
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/794/1/012040
Subject(s) - flushing , rainwater harvesting , environmental science , irrigation , drainage , hydrology (agriculture) , leaching (pedology) , water supply , inflow , outflow , sluice , water resource management , environmental engineering , engineering , geology , geotechnical engineering , soil water , geography , oceanography , soil science , medicine , ecology , archaeology , biology , endocrinology
Due to channel sedimentation, water deficits and flood still becomes problems in Katingan tidal irrigation system, while the stakeholder plans to reclaim new area in the presence of pyrite soil. This research aims to overcome these problems through four water management scenarios simulated using HEC-RAS to meet the needs of water supply, flushing and drainage. The result shows that water leaching requirement for existing area is 2.48 million m 3 and could only be fulfilled by canal normalization. Moreover, extended network with narrow intake canal supplies less than 4.3 million m 3 water leaching, so that wide canal connected to the river is required to facilitate more water flowing into the system. Related to flushing, installing pumps in the middle intake could increase canal circulation with one-way outflow during ebb tide, while the inflow depends on flap gates at the same position. Furthermore, the volume of rainwater is generally able to be discharged for every rainy day by all scenario designs. However, existing condition and network expansion with narrow intake canal have less rainwater deficit duration. In conclusion, leaching and drainage aspects require more water storage and wide canal intake, where flushing criterion need the use of pumps and gates.