§ 14.5. Storage Facilities

Drainage easements will be required for all storm water management facilities accepting runoff from properties other than the lot on which the facility exists or will be constructed.

For regional detention facilities, the drainage easement will encompass the one hundred (100) year pool elevation in addition to all structural improvements (levees, dikes, berms, outfall structures, etc.) necessary to contain the pool. The easement will extend, at a minimum, to the toe of the downstream embankment. The easement shall also extend to a minimum of fifteen (15) feet outside both the one-hundred (100) year pool and the structural improvements to facilitate maintenance as well as public safety.

A one hundred (100) year storm event shall be routed through the proposed dam or basin and all land subject to flooding shall be dedicated as drainage easement. An unobstructed fifteen (15) foot access easement around the periphery of the flooded area shall be dedicated as drainage easement for facilities that require regular mowing or other ongoing maintenance, at the discretion of the Director of TCI. An unobstructed fifteen (15) foot access shall be established, which connects the drainage easement adjacent to the dam structure to a road or alley and the access to be dedicated as a drainage easement.

The adequate routing of spillway discharges pertains to the hydraulic routing of the one hundred (100) year frequency flood for dedication of drainage easement limits.