A. 
A permit shall be required before any construction or development is undertaken within any flood hazard area of the City of Easton.
B. 
No encroachment, alteration, or improvement of any kind shall be made to any watercourse until all adjacent municipalities which may be affected by such action have been notified by the City of Easton, and until all required permits or approvals have first been obtained from the Pennsylvania Department of Environmental Protection Regional Office. In addition, FEMA and the Pennsylvania Department of Community and Economic Development shall be notified prior to any alteration or relocation of any watercourse.
C. 
Any new construction, development, uses or activities allowed within any identified flood hazard area shall be undertaken in strict compliance with the provisions contained in this chapter and any other applicable codes, ordinances and regulations.
D. 
Under no circumstances shall any new construction, use, activity and/or land development adversely affect the capacity of the channels or floodways of any watercourse, drainage ditch or any other drainage facility or system unless otherwise permitted by this chapter.
E. 
All subdivision and land development proposals containing at least 50 lots or a minimum of five acres in the Flood Hazard District where base flood elevation data is not available shall be supported by hydrologic and hydraulic engineering analyses that determine base flood elevations and floodway information. The analyses shall be prepared by a licensed professional engineer in a format required by FEMA for a conditional letter of map revision (CLOMR) or letter of map revision (LOMR).
F. 
Within any floodway area, no encroachments, including fill, new construction, substantial improvements, or other development shall be permitted unless it has been demonstrated through hydrologic and hydraulic analysis performed in accordance with standard engineering practice that the proposed encroachment would not result in any increase in flood levels within the community during the occurrence of the base flood discharge.