Authorizes the Secretary of the Interior to revise the repayment contracts with the Bostwick Irrigation District in Nebraska, the Kansas Bostwick Irrigation District No. 2, the Frenchman-Cambridge Irrigation District, and the Webster Irrigation District, by: (1) equalizing the annual total repayment obligation under the contracts for the distribution works construction charge and the water supply repayment obligation for the remaining years of the contracts, relying upon the annual water supply repayment obligation as of the date of this Act's enactment as the base for equalizing the annual total payments; and (2) extending the date for adjusting the annual deposits into the distribution works reserve fund and the district water supply reserve fund for an additional 10 years.