DESIGN OF A CHANNEL AND FLOODPLAIN CORRIDOR TO RESTORE AQUATIC HABITAT, GEOMORPHIC FUNCTION AND WATER QUALITY IN AN URBANIZED AND REGULATED WATERSHED
The City of Cupertino, California has proposed the establishment of the Stevens Creek Corridor Park. At the park site, Stevens Creek has an incised alluvial channel. Bed morphology is typified by riffles and pools with some external forcing by in-stream large woody material. The channel has been subjected to hydromodification and general anthropogenic disturbance due to upstream reservoir operations, construction of in-stream obstructions, and changes in land use. Land use around Stevens Creek has changed considerably over the last 50 years from primarily orchards to urban neighborhoods and parks. The objective of the project is to improve upon existing in-stream and riparian habitat and associated hydrologic and geomorphic function. To address this objective, we have proposed the removal of four existing fish-migration barriers, channel realignment, construction of riffles and pools based on existing and stable channel forms located upstream of the project reach, installation of fishery-related habitat structures such as Jhooks and large wood elements, and bio-technical slope stabilization measures such as brushlayer fill slopes. Design methodology and analysis included: (a) soil trenching of terrace sediments, (b) a geomorphic survey and analysis of the design reach and reaches upstream and downstream, (c) channel layout alternatives analysis, (d) hydraulic modeling of existing conditions and proposed design conditions, and (e) sediment transport computations of design geometries. The design is scheduled for implementation in summer 2008.
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Document Type: Research Article
Publication date: 01 January 2007
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