---
kind: "section"
citation: "25 C.F.R. § 171.510"
title: "25"
number: "171.510"
heading: "How does BIA calculate my annual operation and maintenance assessment if supplemental water is available on the irrigation facility servicing my farm unit?"
url: "https://uscodex.org/cfr/25/171.510"
---

# §171.510. How does BIA calculate my annual operation and maintenance assessment if supplemental water is available on the irrigation facility servicing my farm unit?

- (a) For projects where supplemental water is available, and you request and receive supplemental water, your assessment will include two components: a base rate, which is for your per-acre water duty delivered to your farm unit; and a supplemental water rate, which is for water delivered to your farm unit in addition to your per-acre water duty.
- (b) We publish base and supplemental water rates annually in the Federal Register. The base and supplemental water rates are established to recover the costs identified in [section 171.500(a)](/cfr/25/171.500.md?p=a) of this subpart.
- (c) If your project has established a supplemental water rate, and you request and receive supplemental water, we will calculate your total annual operation and maintenance assessment by adding the following two totals:
  - (1) The total assessable acres of your land within the service area of our irrigation facility multiplied by the annual operation and maintenance assessment rate we establish for that facility; and
  - (2) The actual quantity of supplemental water you request and we agree to deliver (in acre-feet) times the supplemental water rate established for that facility.

## Notes

### Authority

Authority: 25 U.S.C. 2; 25 U.S.C. 9; 25 U.S.C. 13; 25 U.S.C. 381; Act of April 4, 1910, 36 Stat. 270, as amended (codified at 25 U.S.C. 385); 25 U.S.C. 386a; Act of June 22, 1936, 49 Stat. 1803 (codified at 25 U.S.C. 389 et seq. ).

### Source

Source: 73 FR 11036, Feb. 29, 2008, unless otherwise noted.