ROCKLAND — The cost to address Rockland’s stormwater deficiencies would total $13,753,000, according to an engineering company contracted by the city.

Wright-Pierce engineers of Topsham issued the report last month. Wright-Pierce made a presentation on its report at the Monday evening City Council meeting.

At the Monday evening meeting, residents also spoke about the significant damage to homes from flooding during the Halloween rainstorm. Andrew Reichline of 31 Talbot Ave. said he spent a lot of money to clean up his basement in 2019 and expects it will cost more from this recent storm. There was four feet of standing water outside his home and 10 feet of water in the basement, which resulted in the oil tank breaking loose and spilling 150 gallons of oil.

Lisa Stevens said the flooding at the apartment building at 38 Talbot Ave. destroyed the furnace and electrical in the basement. Two tenants lost cars in the flooding. She said a 2019 storm caused $5,000 in damages.

“It’s suppose to rain this weekend. Could it happen again?” Stevens asked.

“The purpose of this stormwater master plan is to provide the city with the framework to make educated and informed decisions about future stormwater improvement projects, while considering project benefits, costing, and the impact of other planned infrastructure projects that may result in cost savings if completed in conjunction with stormwater improvements,” the report states.

The engineers provided a priority list based on cost/benefit analysis, probability of getting financing, flow reduction, and opportunity to combine with other capital improvement projects.

A project to separate stormwater and sewer lines for 7.5 acres leading to an outfall near Crescent Street is the top priority, with a cost of $1,379,000.

The second highest priority is separating stormwater and sewer from Oak, Orient and Winter streets down to Winter Street at a cost of $1,786,000.

Third on the list is stormwater quality improvements and peak flow reduction, by using porous pavement as a substitute for current pavement on the Oak and Orient streets parking area. Other improvements would be tree boxes. The estimated cost of this project is $753,000, which would be done at the same time as the stormwater separation for Oak and Orient streets.

Also ranking third is a stormwater detention, improvements, and peak flow reduction using more vegetation around Ralph Ulmer Square at North Main and Main streets. The estimated cost is $147,000.

Fourth on the priority list is separating stormwater and sewer around 60 acres in the Front Street area, and replacing the outfall there to a more adequate size. The estimated cost is $6,490,000.

A Harbor Park green infrastructure project is fifth. This would not so much be a stormwater reduction project, but installing a “swirl concentrator device” underground to remove pollutants and debris from entering the harbor. The estimated cost is $132,000.

A new outfall system 725 feet north of Buoy Park is estimated to cost $957,500.

Seventh on the list, but far down in terms of scoring, is a flood control system for the area between Talbot and Rankin streets. This would include creating a system to store water during heavy rainstorms to reduce overflows for properties downstream. The estimated cost is $1,540,000. This project would require significant land acquisition costs, and create a five-to-six foot tall berm to hold up 250,000 cubic feet of water with a 36-inch diameter outlet pipe.

Eighth is a flood control system for the area between Rankin and Gay streets at a cost of $1,392,000. This project would require significant land acquisition costs, and creating a five-to-six foot tall berm to hold up 175,000 cubic feet of water with a 30-inch diameter outlet pipe.

City Manager Tom Luttrell before the city can seek grants for projects it will need complete engineering and have the projects “shovel ready.”

One option, proposed by Wright-Pierce, is to have a bond referendum put before voters for the projects in spring 2022. Councilor Louise MacLellan-Ruf said the city should seek any grant sources before trying to borrow more money.

A page from the Wright-Pierce stormwater management plan shows area where water can be stored to reduce flooding in the Talbot Avenue and Rankin Street area.

Another page from the Wright-Pierce stormwater management plan.