Long Meadow StormWATER Pond Repair
This stormwater pond repair project was located in Columbia, MD, and was conducted as part of Howard County’s Capital Improvement Program for the construction of new, rehabilitation, modification or reconstruction of stormwater management facilities.
The restoration plans, designed by KCI Technologies Inc., included regrading the existing pond bottom and wetland bench areas, removal and replacement of existing principal spillway structures (riser, end wall, pipe, concrete cradle, anti-seep collars), and installation of outfall protection at the principal and emergency spillways. Embankment work included excavation of existing embankment and installation of clay core material with appropriate compaction specifications. Grading within the pond achieved increased storage capacity for the facility. As a result, the pond’s capacity was increased substantially.
Ecotone was responsible for implementing the pond repair design. In order to reduce project costs and increase the sustainability of the project, Ecotone increased stockpile areas for mixing dry material with the extremely wet soil and organics that were removed from the pond. This increase cost-efficiencies by reducing the amount of haul off from the site.
Ecotone was able to manage critical logistics challenges, which included limited access and maneuvering around utilities, in order to completed construction in April 2016.
The restoration project was funded through Chesapeake Bay Trust Fund and the Stormwater Management Division of the Bureau of Environmental Services, Department of Public Works, Howard County, Maryland.
Proposed restoration area prior to construction. The stormwater pond was over 30 years old and failing to collect runoff during storm events.
A silty clay with fine sand particles was used to create an impervious clay core during the construction of the stormwater management facility.