In the valley portion, sand and silt deposits are recorded. Geomorphological divisions of the basin area of the lake comprise a) the undulating uplands which have fairly thick vegetation of mixed crops and plantations, b) the valley fills of laterite alluvium and colluvial deposits with low level areas which are intensely cultivated and thickly populated and c) the flood plains/alluvial plains of the Kallada River on the south that are mostly cultivated.
Sand and silt deposits are recorded in the valley area. The geomorphological divisions of the lake basin encompass a) undulating uplands with mixed crops and plantations, b) valley fills made of laterite alluvium and colluvial deposits with low-lying areas that are intensively farmed and densely populated, and c) flood plains/alluvial plains along the Kallada River on the south which are primarily cultivated.