Landscape Architect & Specifier News

JAN 2018

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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56 Landscape Architect and Specifier News are more costly to install, require higher ongoing maintenance, and create less wildlife habitat due to limitations on what can be planted in the layered media. Schools also derive educational benefits from participating in bioswale planting, conducting water quality monitoring, and having on-campus wildlife observation opportunities. • Relocating storm drain outfalls to the back edge of newly lowered/widened floodplains, and installing bioswales with small detention basins leading from the relocated outfalls across the new floodplains to the creek. • Retrofitting the spillway of a popular 26-acre reservoir in a city park for salmon and steelhead passage, including stocking with fin-clipped sterile hybrid trout and requiring catch-and-release of wild salmonids (which are by definition salmon, trout, chars, freshwater whitefishes and graylings) so that recreational fishing can continue at the reservoir. • Converting the existing levee-protected underground disposal system of the city's wastewater treatment facility along Yreka Creek to a series of natural freshwater marshes and restored accessible floodplain, similar to the Arcata Marsh project on the coast near Eureka, California (not to be confused with Yreka). Eureka is 102 miles south southwest of Yreka. In taking an integrated comprehensive approach, the master plan solves multiple Above: The cross-sections show the method of floodplain lowering and widening to create a new accessible floodplain at the level of an incised stream, i.e., a streambed that has further distanced itself from the floodplain by cutting through sediment or bedrock. The diagrams also show the extent to which the 100-year flood height can be lowered and contained within the newly created floodway, based on hydrologic analyses conducted for the Greenway master plan. The lower diagram shows how spoils can be disposed of nearby to reduce project costs, while also creating elevated building pads for future development. RENDERINGS: KIM SOLGA ARTWORKS Continued on page 86

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