---
kind: "section"
citation: "43 U.S.C. § 509b"
title: "43"
title_heading: "Public Lands"
number: "509b"
heading: "Additional project benefits through the construction of new or supplementary works"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/43/509b"
units:
  - "Chapter 12 — Reclamation and Irrigation of Lands by Federal Government"
  - "Subchapter XI–A — Reclamation Safety of Dams"
---

# §509b. Additional project benefits through the construction of new or supplementary works


Notwithstanding [section 507 of this title](/usc/43/507.md), if the [Secretary](/usc/43/485a.md?p=b), in her judgment, determines that additional [project](/usc/43/485a.md?p=c) benefits, including but not limited to additional conservation storage capacity, are necessary and in the interests of the United States and the [project](/usc/43/485a.md?p=c) and are feasible and not inconsistent with the purposes of this subchapter, the [Secretary](/usc/43/485a.md?p=b) is authorized to develop additional [project](/usc/43/485a.md?p=c) benefits through the construction of new or supplementary works on a [project](/usc/43/485a.md?p=c) in conjunction with the [Secretary](/usc/43/485a.md?p=b)’s activities under [section 506 of this title](/usc/43/506.md) and subject to the conditions described in the feasibility study, provided a cost share agreement related to the additional [project](/usc/43/485a.md?p=c) benefits is reached among non-Federal and Federal funding participants and the costs associated with developing the additional [project](/usc/43/485a.md?p=c) benefits are allocated exclusively among beneficiaries of the additional [project](/usc/43/485a.md?p=c) benefits and repaid consistent with all provisions of Federal Reclamation law (the Act of June 17, 1902, [43 U.S.C. 371](/usc/43/371.md) et seq.) and acts supplemental to and amendatory of that Act.


## Source credit

(Pub. L. 95–578, § 5B, as added Pub. L. 114–113, div. D, title II, § 203(2), Dec. 18, 2015, 129 Stat. 2406.)

## Notes

### Editorial Notes

### References in Text

Act of June 17, 1902, referred to in text, is act June 17, 1902, ch. 1093, 32 Stat. 388, popularly known as the Reclamation Act, which is classified generally to this chapter. For complete classification of this Act to the Code, see Short Title note set out under section 371 of this title and Tables.