This paper reviews the estimation methods developed and used in India for low-flow, long-term mean flow and flood characteristics. The review is intended to provide a quick reference guide for such methods used for hydrological prediction in ungauged basins. As such it lists identified estimation formulae for various parts of India with necessary parameters. The paper also effectively gives a quick assessment of the status of hydrological predictions at ungauged sites in India. Few studies focusing on low-flow estimation at ungauged sites have been identified. Considerable work has been done to estimate flood characteristics and long-term mean annual flow using regression relationships with catchment parameters, but most of these methods were developed a long time ago and may need to be revisited. The practice of flow estimation at unagauged sites in India could benefit from improved access to already collected observed flow data.
Jha, R.; Smakhtin, V. A review of methods of hydrological estimation at ungauged sites in India. International Water Management Institute, Colombo, Sri Lanka (2008) 28 pp. ISBN 978-92-9090-693-3 (IWMI WorkingPaper 130)