International RD Conference of the Central Board of Irrigation and power, 15 18 Feb, 2005, Bangalore. CWRDM, 1999. Sand Mining in Kerala with special reference to Periyar, Centre for Water Resource Development and Management, Kozhikode, 61p. CWRDM, 2006. Quarrying of river sand from the rivers flowing with Kozhikode District of Kerala State in India.