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• "Grade"means the surface of the ground. "Grading"means to smooth the surface of the ground, typically with heavy construction equipment. "Highest Adjacent Grade"(HAG) means the highest natural elevation of the ground surface prior to construction next to the proposed walls of a structure. "Historical Structure"means any structure that is: 1. Listed individually in the National Register of Historic Places (a listing maintained by the Department of Interior) or preliminarily determined by the Secretary of the Interior as meeting the requirements for individual listing on the National Register; 2. Certified or preliminarily determined by the Secretary of the Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the Secretary to qualify as a registered historic district; 3. Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the Secretary of the Interior; or • 4. Individually listed on a local inventory or historic places in communities with historic preservation programs that have been certified either: a. By an approved state program as determined by the Secretary of the Interior or; b. Directly by the Secretary of the Interior in states without approved programs. "Hydrodynamic forces"are the forces and stresses associated with moving water, including impacts from objects carried in the water. "Hydrostatic flood forces"are the forces and stresses associated with standing floodwaters. "Lacustrine Flooding"is flooding associated with a lake. "Lateral forces"are the horizontal hydrostatic forces associated with standing water. Water exerts an equal force in all directions, and as little as three feet of standing water can generate sufficient lateral force to collapse a foundation or wall. • 6