A special fund established by Congress under the Reclamation Act of 1902, as amended, for receipts from the sale of public lands and timber, proceeds from the Mineral Leasing Act, and certain other revenues. Congress appropriates money from this fund for the investigation, construction, operation, and administration of Bureau of Reclamation projects. Collections from water users for payments made on the reimbursable costs of the federal projects are also returned to the fund.