The following provisions shall apply in a floodway:
A. A project in the regulatory floodway must undergo an encroachment review to determine its effect on flood flows. An encroachment analysis must include:
1. Determination and documentation that the filling, grading or construction of a structure will not obstruct flood flows and will not cause an increase in flood heights upstream or adjacent to the project site;
2. Determination and documentation that grading, excavation, channel improvements, bridge and culvert replacements that remove an obstruction, do not cause increases in downstream flood flows;
3. Certification and documentation by a licensed professional engineer that the project will not result in a rise in flood heights;
4. The administrator may make the encroachment determination for minor projects.
B. An encroachment in the floodway or floodplain that will cause an increase in the base flood elevation in excess of the allowable level must have a conditional letter of map revision granted by FEMA before it will be permitted. (Ord. 513, 4-13-2010, eff. 5-3-2010)