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New relief sewer and detention connections aim to reduce flooding in Venice/Monroe corridor
Summary
Staff described recent drainage work in the Venice/Monroe area that created relief connections from detention ponds to an existing trunk sewer, improving outlets and enabling property owners to tie in yard drains to reduce localized flooding.
City staff described drainage improvements near Venice and Monroe where heavy rains previously caused underpass and neighborhood flooding. Engineers installed relief sewers that allow detention ponds to drain to an existing trunk storm sewer on Edgewater, rather than rely solely on a single undersized outlet.
The staff member said the ponds constructed with the overpass were designed for a 10-year event; heavy multi-source runoff can overwhelm that capacity. The relief sewer is intended to route surcharge flows to the west when pond elevations are high, and the city installed additional drainage to allow nearby property owners to connect yard drains.
“Basically, what we’re able to do was install a relief sewer so that if there is a surcharge in those detention ponds, the sewer system that it’s currently using is undersized… now they can drain to the west and to the east,” the staff member said. Work included new drainage on the south side of the corridor to improve outfalls. Staff said the design provides a secondary outlet and the option for homeowners to connect yard drains to reduce flooding on private property.
Staff said the system aims to reduce the risk from recurring intense storms but that no solution can fully protect against very large events. The commission did not take formal action; staff will monitor performance and residents are being informed of connection options.
