Together-Immediately Defeating Erosion Act of 2005 - Amends the Federal Water Pollution Control Act to direct the Administrator of the Environmental Protection Agency (EPA) to use appropriated funds to participate in environmental restoration and resource protection programs and projects in the Louisiana coastal area and to enter into an agreements with other federal agencies to to carry out interagency projects.
Amends the Watershed Protection and Flood Prevention Act to direct the Secretary of Agriculture, acting through the Natural Resources Conservation Service, to use authorized funds to: (1) give technical and financial assistance to local organizations in planning and carrying out watershed projects for flood protection and other purposes consistent with the comprehensive Louisiana coastal conservation, protection, and restoration program; (2) enter into a project agreements with other federal agencies; and (3) implement projects to protect or restore watersheds and the ecosystem in coastal Louisiana.