20180718 13023400 1.0 TRUE 20181008 12083100 Hydrology Lines Hydr line includes any other channel, aquaduct, coastline, culvert, drainage canal, dry water course, culvert, drainage canal, dry water course, furrow, irrigation canal, irrigation tunnel, navigable canal, non-perennial river, perennial river, rapid, siphon, unknown river, water pipe and waterfall. National Geo-spatial Information