Technical sources place the reservoir across the Kallar between the Vayalar hills and Semmalai. Rain arriving through a short seasonal catchment is stored in a district where wells, tanks and uneven monsoon water shape farming.
A modern work, not an ancient tank
Published accounts put the project near ₹33 crore and its entry into use around 2015. The safe history is a modern public work created after years of demand for dependable irrigation and drinking water.
Why the numbers disagree
One account gives 615 metres and 30.67 million cubic feet; another gives 665 metres and 41 million cubic feet divided between uses. They may measure different components or storage categories. The guide preserves the conflict instead of selecting the tidier number.
Read the level carefully
A full basin records rain and management; a low basin may reflect drought, demand or release. From a single visit, do not infer climate, blame farmers or walk across exposed silt.