Drainage Infrastructure

Assessing How Stormwater Is Managed

The adjacent diagram illustrates the existing infrastructure and delineates direct (connected to the Strawbery Banke Museum campus) and indirect networks (disconnected from the campus.) The direct network ties into the indirect network under Marcy Street. The stormwater runoff from the museum campus therefore competes for pipe volume when the watershed runoff is combined in the outlet pipe. Both pipe networks tie into the same outfall structure in Prescott Park.

Today there is a window of approximately four to six hours during each tide cycle where the outfall sees daylight and therefore is capable of draining the closed pipe network. During the current king tide or under future extreme tides and storm surges, the outfall will be underwater and portions of the pipe network will be filled of seawater.

The strategies outlined in this report aim to utilize the existing closed pipe infrastructure during low tide. The addition of several of short-term detention techniques and overland, overflow controls will provide additional relief during severe storms.

ON-CAMPUS (DIRECT DRAINAGE INFRASTRUCTURE)

DRAIN MANHOLE

CATCH BASIN INLET

PIPE CONNECTION

OFF-CAMPUS (INDIRECT DRAINAGE INFRASTRUCTURE)

DRAIN MANHOLE

CATCH BASIN INLET

PIPE CONNECTION

STORMWATER OUTFALL (IN PRESCOTT PARK)