Fig. 4. (A): Water supply (river regime and rainfall) and (B): desired water level (i.e. demand). Data used to construct figures based on Department of Hydrology and Meterology, Nepal (2002) (rainfall), Nippon Koei Company, Ltd (1986) (riverflow), Brouwer and Heibloem (1986) (water requirements for paddy rice), and Shukla et al. (1993) (paddy planting cycle in Chitwan).