PUBLIC LAW 102-580—OCT. 31, 1992 106 STAT. 4855 1899, section 404 of the Federal Water Pollution Control Act, and the National Environmental Policy Act of 1969. (c) EXPIRATION DATE. —I f, 20 years from the date of the enactment of this Act, any area or part thereof described in subsection (a) is not bulkheaded or filled or occupied by permanent structures, including marina facilities, in accordance with the requirements set forth in subsection (b), or if work in connection with any activity permitted in subsection (b) is not commenced within 5 years after issuance of such permits, then the declaration of nonnavigability for such area or part thereof shall expire. SEC. 336. LOCKWOODS FOLLY RIVER, BRUNSWICK COUNTY, NORTH CAROLINA. (a) IN GENERAL.— The Secretary shall carry out an exchange rate demonstration project under section 1135 of the Water Resources Development Act of 1986 (100 Stat. 4251) at the Eastern Channel of the Lockwoods Folly River, Brunswick County, North Carolina. (b) AUTHORIZATION OF APPROPRIATIONS.— There is authorized to be appropriated to carry out this section $1,000,000 for fiscal years beginning after September 30, 1992. Such sums shall remain available until expended. SEC. 337. PORT EVERGLADES, FLORIDA. (a) DETERMINATION.—The Secretary shall review the construction performed by non-Federal interests at the project for navigation. Port Everglades, Florida, to determine the Federal navigation interest in such work. (b) REIMBURSEMENT.— If the Secretary determines under subsection (a) that the work performed by non-Federal interests is consistent with the Federal navigation interest, the Secretary may reimburse non-Federal interests an amount equal to the estimate of the Federal share of the cost of construction of the Southport channel and turning notch at Port Everglades, Florida. SEC. 338.1993 WORLD UNIVERSITY GAMES. The Secretary is authorized to use available resources (both personnel and material) to the greatest extent possible to support the logistical and minor construction needs of the local organizing committee of the 1993 World University Games in Western New York for the purpose of supplementing the involvement by the Secretary in the games requested by the Department of Defense, Office of Special Events Management. SEC. 339. NUISANCE AQUATIC VEGETATION IN LAKE GASTON, VIR- GINIA AND NORTH CAROLINA. (a) IN GENERAL. —The Secretary is authorized to undertake a program to control nuisance aquatic vegetation for the purpose of preserving the recreational uses of the waters of Lake Gaston, Virginia and North Carolina. (b) AUTHORIZATION OF APPROPRIATIONS. — -There is authorized to be appropriated for the Federal share of the cost of the program authorized by this section $200,000 per fiscal year for each of fiscal years 1993 and 1994.