February 24, 2015
SMC was contracted by the Montgomery County Division of the Maryland National Capital Park and Planning Commission (MNCPPC) to modify an existing pond outfall and restore the stream at the Ovid Hazen Wells Recreation Park located in Clarksburg, MD. The pond outfall structure had come to the end of its lifespan and needed to be replaced. The approach utilized was to grout the existing outfall in-situ and regrade the pond embankment to create an emergency spillway at a lower elevation and create a stable discharge swale that tied into a local stream.
SMC staff conducted all construction activities including: site stake out and as built survey, demolition of an existing farm bridge that was failing and replacing it with a channel crossing ford, installation and maintenance of erosion and sediment control measures, excavation and placement of in situ soils, installation of imbricated stone cross vane structures, creation of pocket wetland features, installation of woody debris and plantings, and the installation of a imbricated rip rap cascade feature to tie the discharge channel into the existing stream. SMC subcontracted a landscaping partner to install native plants to complete the project.
The design approach applied to the discharge channel included the installation of roughness features such as woody debris and pocket wetlands with plantings. The integration of these features helped to improve the habit created by the project while providing additional water storage capacity and velocity reduction measures.