Watertown’s water issues are complex, including high groundwater, historic development patterns, low areas surrounded by higher topography, and lots of hard surfaces, draining toward the nearest creek, wetland or the Rock River. Storm sewers, ditches, swales, culverts, stormwater ponds and other Best Management Practices such as underground storage systems, infiltration basins, biofilters, permeable pavers, rain gardens and rain barrels exist on public and private property throughout the City. These systems are designed to capture and convey stormwater runoff safely with minimal impacts to private property and public infrastructure.

A City-wide Flood Control Master Plan Report was developed between 2022 & 2023. Personnel Computer Storm Water Management Model (PCSWMM) was completed for storm sewer systems of 18 inches or greater throughout the City to identify significant flooding areas during the 10-year, 100-year and 500-year rain events. This modeling, along with staff knowledge and documentation of past flood events, was used to develop a list of 15 priority areas. Conceptual recommendations were developed for these areas with cost estimates to help guide City staff toward plan implementation. Further study and construction designs will be needed to finalize flood control solutions.

Flood Control Master Plan Report 2024