Excelsior Springs Court Stormwater Retrofit
This stormwater pond retrofit project located in Ellicott City, MD, 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 McCormick Taylor, included the excavation of an existing embankment, installation of a new principal spillway, and the restoration of approximately 100 linear feet of degraded stream channel downstream of the storm water management facility.
Ecotone, responsible for implementing the design, focused primarily on the facility retrofit construction. This required the excavation of the existing embankment and the removal of the existing 48” corrugated metal pipe and associated riser, and end wall. The existing pipe and riser were then redesigned to increase storage capacity and replaced to include the installation of a clay core material and new principal spillway. Significant grading was completed within the basin of the pond to increase storage capacity. Stream restoration construction consisted of riffle and pool grading, boulder toe installation, plunge pool grading and installation, and bank grading and stabilization.
Ecotone was able to manage critical logistics challenges, which included the reordering of project sequencing in an effort to complete in-stream construction prior to the stream closure date.
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.
Prior to construction, Excelsior Spring Court’s storm water management pond was in need of retrofit following the failure of the existing pipe and rise unit.
During construction, the principal spillway was replaced to include the installation of a new pipe, riser, and endwall.
The Excelsior Springs Court Principal Spillway Replacement established a stable outfall system while restoring 100 linear feet of degraded stream channel.