ESTIMASI NILAI EKONOMI AIR IRIGASI DAN STRATEGI PEMANFAATANNYA DALAM PENENTUAN IURAN IRIGASI

Abstract

The study is aimed to valuate irrigation water and to assess its prospect for
water pricing strategy, and implication of optimal cropping pattern on farm's income
and rice production. Mathematical programming is applied for the valuation. Strategy
of water pricing based on the reconciling efficiency and equity concern. Results of the
study show that shadow price of irrigation water were equal to zero on December–May
and positive on June–November. Within the positive period, the lowest and highest
prices were taken place on June and September respectively. Monthly average of the
shadow price was Rp. 40 700/(l/sec), which is equivalent with Rp. 15.75/m3. It is
feasible to apply the shadow price for determining ceiling rate of irrigation water
charges. Potential method of water pricing is combination of per unit area in wet season
and per crop pricing in dry season. Implementation of optimal cropping pattern as well
as water pricing was potential to improve both farm's income and irrigation efficiency,
but disincentive to increase rice production.