; (3) the economic, safety, and environmental benefits and impacts of establishing a permanent feature in the watershed of the impacted community; (4) the extent of the modifications necessary to make the temporary structure a permanent feature; and (5) the costs of the modifications described in paragraph (4). (d) Conversion of temporary structures (1) In general After the Secretary completes an evaluation under subsection (b), if the Secretary determines that the temporary structure should become a permanent feature, or that a permanent feature would prevent damage similar to damage prevented by the temporary structure, and subject to paragraph (2), the Secretary shall begin the planning and design of the permanent feature in accordance with all applicable design and construction standards and legal requirements of the Secretary, including all applicable environmental laws. (2) Project cost (A) In general The Secretary may carry out the planning, design, and construction of a project described in paragraph (1) if the total construction cost of the project is not expected to exceed $17,500,000. (B) Large projects If the total construction cost of a project described in paragraph (1) is expected to be greater than $17,500,000, the Secretary— (i) shall submit to Congress a request to carry out the project in a manner similar to a Chief's Report