STREAM STABILITY ASSESSMENT
Assessment Services for Streams, Rivers and Channels
WRMA is a provider of stream stability assessment services for local and regional transportation projects, counties and water utilities. A WRMA stream stability assessment provides a comprehensive study of relevant stream corridor processes, characteristics and functions. Every stream is unique to its own environment and during a stability assessment, WRMA's hydraulic engineering team will analyze, through use of hydraulic modeling, the relevant hydrologic and hydraulic processes and forces acting on a given stream. Additionally, WRMA will consider geomorphic processes which may include factors that affect channel cross section and profile as well other important processes such as sediment loading and floodplain characteristics. Streams also provide habitats and food sources for numerous species of fish and fauna and therefore, the stability of stream, or lack thereof may have an impact on an ecosystem. As such, during a stability assessment, WRMA biologists and environmental scientists will study the physical and chemical characteristics of the stream and its associated biological community. Lastly, given the hydraulic data and study of geomorphic and ecological functions of the stream corridor, WRMA engineers can make a determination as to the stability of the corridor and what dynamic equilibrium exists if any. WRMA steam stability assessments can form the basis for developing restoration plans to restore the dynamic equilibrium to some prior state.
Development of Stream Restoration Alternatives
WRMA stream stability assessments typically are provided in response to reported issues with identified streams that may threaten the stability of crossing roadways or bridges. WRMA can assist municipal water and transportation agencies in defining their restoration goals. Important to this process is identifying the scale of a proposed project, desired objectives and legal issues which may affect property owners or established base flood elevations. For this reason, WRMA's certified flood plain managers can guide the development of restoration alternatives to ensure both constructability and feasibility with regards to FEMA regualtions. Additionally, WRMA's restoration specialists will consider multiple restoration methods, including both active and passive restoration methods.
Post-Restoration Monitoring and Inspection Services
Once a stream restoration project has been completed, a crucial step is to ensure that implemented restoration measures are addressing the causes of impairment and were constructed correctly according to specified details. For this reason, WRMA provides monitoring services during construction as well as post-construction in order to monitor the health of the stream as it undergoes each phase of the restoration process. Monitoring services may include frequent periodic inspection of vegetative bank stabilization measures, tree plantings and instream habitat structures to confirm restoration of not only the stream corridor but also all affected areas within the limits of disturbance.