A. DESIGN AND ENGINEERING OF STREAM RESTORATION PROJECTS: Stream restoration projects may be designed to improve stream conditions, provide improvements to watershed water quality, enhance/protect in-stream and riparian habitat, and restore aesthetic conditions. To accomplish this goal, the specific objectives of the stream restoration projects may be to: i. Restore the stream channel and riparian area using natural stream channel design principles and bioengineering approaches to improve bank and channel stability and reduce erosion using low impact equipment; ii. Create a stream channel and floodplain that is dynamically stable, provides hydrologic and sediment transport continuity, and, if possible, reestablish floodplain connectivity; iii. Create a range of aquatic habitats and associated riparian areas to enhance and support the existing ecological community; iv. Work within site constraints and other considerations, including the development of a design consistent with local geology (i.e., possible karst), and avoid or minimize disturbance to existing trees, infrastructure, utilities, etc.; v. Improve the aesthetic value of the site; vi. Identify and incorporate school and/or educational needs into the project to facilitate, when applicable, future learning opportunities associated with the stream and the restoration project; and vii. Easement, right-of-way, or record plat preparation. viii. Based on the objectives outlined above, the City expects that a successful project will: a) Demonstrate design and as-built tolerances that are within the range of natural variability for streams of this type; b) Over time, and a wide range of flow conditions, maintains the design: 1. Width/Depth rations; 2. Slope Ranges; 3. Bed Features; 4. Structure location, condition and function; 5. Bankfull elevation; 6. Stream type; 7. Sediment and hydraulic transport regime; 8. Stabilize banks to prevent continued erosion; 9. Result in the establishment of a riparian buffer that uses a diverse mix of native species to trap sediment, break up concentrated overland flows, provide stream shading, and filter excessive nutrients; 10. Require minimal long-term maintenance; 11. If requested, the Consultant shall develop a monitoring plan (potentially up to five years) for the restoration project. Monitoring is for vegetation growth (to ensure at least 85% successful growth), stream channel morphology, and the stability of structural components of the restoration project and any applicable permit requirements; and 12. Prepare maintenance plans for City personnel. B. WETLAND DESIGN/RESTORATION: Wetland projects may be designed in an effort to restore wetland conditions, including habitat, hydrologic function and biologic diversity; improve watershed water quality; and restore aesthetic conditions. The design of wetland projects may include the following: i. Site investigations (i.e., defining existing topography, characterizing existing soils, determining existing hydrologic conditions); ii. Wetland delineation; iii. City, State and Federal permitting; iv. Determining biological criteria (e.g., vegetation, wildlife usage and fish spawning); v. Hydrologic and hydraulic modeling (e.g., flow velocities, flow resistance, flooding depth, storage capacity, etc.); vi. Geotechnical investigations (e.g., geologic setting, geomorphic setting, wetland form and size, soil composition and texture, etc.); vii. Erosion and sediment control design; viii. Grading plans; ix. Construction phasing and staging; and x. Construction cost estimating.
