PUBLIC LAWS-CH. 356 -JULY 30, 1947 58 Stat. 838 . 23 U.S. C . §T60-63. Buildings for stor- age of equipment. Post, p. 698. 49 Stat. 1570. 33U.S.0.§§701a- 701h. Yazoo and Little Tallahatchie water- sheds. Allocation of funds. 49 Stat. 163. Cost of buildings. Construction on land not owned by Government. Central State agen- cy, Mo. and maintenance of roads and trails on experimental areas under Forest Service administration, (1) $11,000,000 for forest development roads and trails, and (2) $5,300,000 for forest highways, which sums are authorized to be appropriated by the Act of December 20, 1944 (Public Law 521), in all, $16,300,000 (including not to exceed $100,000 for personal services in the District of Columbia), to be immediately available and to remain available until expended: Provided,That this appropriation shall be available for the rental, purchase, construction or alteration of buildings necessary for the storage and repair of equipment and supplies used for road and trail construction and maintenance, but the total cost of any such building purchased, altered, or constructed under this authorization shall not exceed $10,000, with the exception that any building erected, purchased, or acquired, the cost of which was $10,000 or more, may be improved within any fiscal year by an amount not to exceed 2 per centum of the cost of such buildings certified by the Secretary. FLOOD CONTROL Flood control: For expenses necessary, in accordance with the Flood Control Act, approved June 22, 1936, as amended and supple- mented, to make preliminary examinations and surveys, and to per- form works of improvement, $1,000,000, including personal services in the District of Columbia, to be immediately available and to remain available until expended, with which shall be merged the unexpended balances of funds heretofore appropriated or transferred to the Department for flood control purposes: Provided, That no part of such funds shall be used for the purchase of lands in the Yazoo and Little Tallahatchie watersheds without specific approval of the county board of supervisors of the county in which such lands are situated: Provided further, That allocations of funds for the fiscal years 1947 and 1948 for works of improvement on individual watersheds shall be in the respective amounts set forth in the Department's budget justifications to the House Appropriations Committee and shall not be decreased except as may be necessary by reason of a decrease in the estimates of available prior year balances: Provided further That not less than $500,000 of the funds hereby appropriated shall be allocated to the watersheds of the Upper Mississippi, Missouri, and Ohio Rivers and their tributaries. SOIL CONSERVATION SERVICE For expenses necessary to carry out the provisions of the Act approved April 27, 1935 (16 U. S . C. 590a-590f), which provides for a national program of erosion control and soil and water conser- vation, including not to exceed $856,750 for personal services in the District of Columbia, furnishing of subsistence to employees, opera- tion and maintenance of aircraft, and the purchase and erection or alteration of permanent buildings: Provided, That the cost of any building purchased, erected, or as improved, exclusive of the cost of constructing a water supply or sanitary system and connecting the same with any such building, shall not exceed $2,500 except where buildings are acquired in conjunction with land being pur- chased for other purposes and except for eight buildings to be con- structed at a cost not to exceed $15,000 per building: Provided further, That no money appropriated in this Act shall be available for the construction of any such building on land not owned by the Government: Provided further, That in the State of Missouri where the State has established a central State agency authorized to enter 540 [61 STAT.