; (III) ecological function, including forests, grasslands, and deserts; (IV) bodies of water, including lakes, flood plains, headwaters, and wetlands; and (V) native soil characteristics of composition, structure, and transmissivity. 4. Centers of Excellence for innovative stormwater control infrastructure (a) Establishment of centers (1) In general The Administrator shall provide grants, on a competitive basis, to eligible institutions to establish and maintain not less than 3, and not more than 5, centers of excellence for innovative stormwater control infrastructure, to be located in various regions throughout the United States. (2) General operation Each center shall— (A) conduct research on innovative stormwater control infrastructure that is relevant to the geographical region in which the center is located, including stormwater and sewer overflow reduction, other approaches to water resource enhancement, and other environmental, economic, and social benefits; (B) develop manuals and establish industry standards on best management practices relating to State, tribal, local, and commercial innovative stormwater control infrastructure for use by State, tribal, and local governments and the private sector; (C) develop and administer testing and evaluation protocols to measure and verify the performance of stormwater infrastructure products and practices; (D) provide information regarding research conducted under subparagraph (A), manuals developed under subparagraph (B), and testing and evaluation performed under subparagraph (C) to the national electronic clearinghouse center for publication on the Internet website established under subsection (c) to provide to the Federal Government and State, tribal, and local governments and the private sector information regarding innovative stormwater control infrastructure; (E) provide technical assistance to State, tribal, and local governments to assist with the construction, operation, and maintenance of innovative stormwater control infrastructure projects