Ellicott City in Howard County is taking firm steps towards mitigating the risk of flooding with the opening of the latest retention pond in the Safe and Sound flood plan. The H-4 pond is expected to have a significant impact on diverting stormwater from the city's vulnerable Main Street, a locale that has faced several severe flooding incidents in the past decade. The pond will not only help manage stormwater but also contribute to the greenery of the area with the planting of hundreds of trees and shrubs.
The H-4 stormwater retention pond, claimed as the watershed's largest, has the capacity to hold up to 5.5 million gallons of water. This development comes as a relief to local businesses that have been plagued by floodwaters for years. According to WBALTV, Howard County Executive Calvin Ball lauded the project, stating, "The H-4 project also includes the planting of 560 trees and 370 shrubs on site, which will return much of this area to green over time." Construction was initiated 15 months prior, placed strategically on the north side of Frederick Road west of U.S. Route 29 in an effort to protect the historic Main Street and the businesses it harbors.
This aquatic bulwark is part of a broader strategy involving multiple ponds that together sum up to a retention capacity of 13 million gallons. The Safe and Sound program incorporates additional flood prevention measures, including a substantial tunnel designed to redirect stormwater directly into the Patapsco River, slated for completion in the fall of 2027. As reported by WMAR2 News, County Executive Calvin Ball emphasized, "All three ponds combined now will provide 13 million gallons of stormwater retention capacity equivalent to a football field filled with water 30 feet deep."
Financial backing for the retention pond's construction is a combination of state and county funding. The Maryland Department of the Environment's Comprehensive Flood Management Grant Program contributed $3.2 million, with the remainder, nearly $1.1 million, coming from the county's coffers. Demolition of four buildings on lower Main Street has already been completed, with plans to convert the space into a park, furthering the county's efforts in reshaping the area into one that can better manage natural adversities.
