; and of which such sums as are necessary to cover 35 percent of the costs of construction, replacement, rehabilitation, and expansion of inland waterways projects shall be derived from the Inland Waterways Trust Fund, except as otherwise specifically provided for in law: Provided, That the Secretary shall not deviate from the work plan, once the plan has been submitted to the Committees on Appropriations of both Houses of Congress: Provided further, That of the unobligated balances from prior year appropriations available under this heading, $83,448,000 is rescinded: Provided further, That no amounts may be rescinded from amounts that were designated by the Congress as an emergency requirement pursuant to a concurrent resolution on the budget or the Balanced Budget and Emergency Deficit Control Act of 1985: Provided further, That of the amounts made available under this heading, $400,000,000 is designated by the Congress as being for an emergency requirement pursuant section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. MISSISSIPPI RIVER AND TRIBUTARIES For expenses necessary for flood damage reduction projects and related efforts in the Mississippi River alluvial valley below Cape Girardeau, Missouri, as authorized by law, $353,145,000, to remain available until expended, of which $16,057,000, to be derived from the Harbor Maintenance Trust Fund, shall be to cover the Federal share of eligible operation and maintenance costs for inland harbors: Provided, That the Secretary shall not deviate from the work plan, once the plan has been submitted to the Committees on Appropriations of both Houses of Congress: Provided further, That of the unobligated balances from prior year appropriations available under this heading, $1,112,000 is rescinded: Provided further, That no amounts may be rescinded from amounts that were designated by the Congress as an emergency requirement pursuant to a concurrent resolution on the budget or the Balanced Budget and Emergency Deficit Control Act of