; (B) invest and reinvest those amounts for the benefit of the program; and (C) otherwise administer the implementation of this section to support partnerships between the public and private sectors in accordance with this section. (g) Cost sharing The Federal share of the cost of a project for which a grant is provided under this section may not exceed 55 percent of the total cost of the project. (h) Priority In selecting projects to receive assistance under the program, the Secretary shall give priority to projects with matching funds from State and local governments or Mexican governments. (i) Authorization of appropriations There are authorized to be appropriated for each fiscal year such sums as may be necessary to carry out this section. 5. Monitoring and notifications (a) Transboundary Waterway Alert System Using the systems of the International Boundary and Water Commission, United States and Mexico, the Secretary of State shall establish an updated and online system, to be known as the Transboundary Waterway Alert System (in this section referred to as the System ), to monitor, warn, and protect citizens of the United States from undue and avoidable harm from wastewater, sewage, trash, and sediment spills and flooding for each major waterway along the United States-Mexico border. (b) Objectives The objectives of the System shall be to monitor all the waterways along the United States-Mexico border— (1) to ensure updated and timely information on all water testing results, wastewater, sewage, trash, and sediment spills, and flood warnings