Areas Currently Subject to 100‐Year Flooding in
Mill Creek, Peaks Branch and State Thomas Watersheds
Flood Relief After Tunnel is Constructed. Note: The tunnel provides 100-year trunk storm drain capacity. Additional improvementsare necessary to capture and convey the 100-year surface runoff to the trunk drain systems.
Illustration showing the size of the tunnel and giving relative depth
Chart depicting the tunnel depth along the length of the project.