Integrate lithologic-geomorphic units by superimposing the lithological and geomorphological map overlays. These integrated lithologic-geomorphic units are the ‘hydrogeomorphic units’ and have to be annotated with alphanumeric codes, e.g. PPS-71, PPD-81, UPM-32, etc. wherein the alphabetic code represents the geomorphic unit and the numeric code represents the lithologic unit. Transfer the geological structures from the structural map overlay on to the integrated lithologic-landform map. The geological structures, which act as conduits and barriers for groundwater movement, should be drawn.