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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Page 54 of 133

January 2018 55 brought 3 additional creek side landowners to the table that had previously been reluctant to participate. Other innovative design solutions included in the master plan: • Retrofitting storm drains to allow street runoff from smaller more frequent storm events (the runoff that contains the most contaminants) to flow above-ground through previously de-watered natural ephemeral drainages where it will be slowed down, contaminants will be filtered out, and runoff will soak into the ground to reduce winter peak flows and raise summer base flows in the creek. These drainages will also be restored with native vegetation to provide urban wildlife corridors. Runoff from large storm events will still be routed into existing storm drains to prevent localized flooding. • Development of extensive bioswales, starting with retrofitting school campuses, that function in the same manner as natural ephemeral drainages and consist of gravel-lined channels, floodplains vegetated by native plants, and numerous small detention basins with metered outlets. This design solution was chosen where adequate space was available (such as at schools), in lieu of using engineered rain gardens with layered media that Right: The modeled reduction in 100-year flood extent—to be implemented in 2018—is shown by the light blue dash lines (existing 100-yr. flood limit) and the dark blue dashed lines (final 100-yr. flood limit). Several buildings will be removed to lower and widen the floodplain.

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