DFI engineers possess extensive experience in the areas of design and inspection of Stormwater Management Facilities, Outfalls and Stream Restoration projects and are cross-trained in all areas to offer our clients a one stop shop for these engineering and environmental services. Our engineers have been at the forefront of the latest changes to the approach of handling stormwater management in the State of Maryland. DFI has utilized Low-Impact Development (LID) techniques with all development designs for both public and private projects to provide green infrastructure design solutions. DFI engineers are extremely knowledgeable with the design principles and implementation of Environmental Site Design (ESD) to the Maximum Extent Possible (MEP). DFI incorporates these design techniques early in the design process all in an effort to preserve the natural drainage and landscape features associated with each project.
In conjunction with the development of a project’s on-site stormwater management program, DFI evaluates the adequacy of the outfalls that a site drains to including any adjacent streams and waterways. DFI has specialized in the design of stormwater conveyance systems that outfall sites through design of small scale vegetated practices in lieu of the traditional piped outfall designs. These designs further enhance water quality along the flow path of stormwater by passing though naturally vegetated interconnected step pools.
Additionally, DFI is experienced with the processes and procedures for providing stream restoration design and inspection. DFI engineers have designed cost effective restoration measures for failing stream beds which provide environmental benefits and reduce stream impairments that negatively impact water quality.
This overall design process provides a holistic approach to improving water quality associated with the wide variety of development projects in which DFI is involved.
Anne Arundel County initiated this project under the MS-4 permit in order to comply with the NPDES regulations and Chesapeake Bay TMDL’s. DFI provided the inspection for the stream restoration construction as well as the monitoring of sediment and erosion control measures.
Phase 2 of this project included the removal of concrete weirs and the use of a step pool conveyance system to restore and stabilize the stream channel. DFI also inspected Phase 1 constructions which were finished 2 years prior. DFI discovered that the undersized cobble material and several step pools had shifted downstream, and this careful monitoring will allow for post-construction longevity for the Crofton Tributary Stream.