Restoring Floodplain Capacity and Hyporheic Function in an Urban Setting Thornton Confluence and Kingfisher Projects Mike (Rocky) Hrachovec, P.E.
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1 Restoring Floodplain Capacity and Hyporheic Function in an Urban Setting Thornton Confluence and Kingfisher Projects Mike (Rocky) Hrachovec, P.E.
2 Project Locations: Historic Map of Thornton Creek orth Branch Confluence Site South Branch Kingfisher Site Mainstem
3 Project Locations: Current Map of Thornton Creek 7,400 Acre Basin 50% Impervious Channel width 2X historic Sediment 6-10X historic South Branch orth Branch Confluence Site Mainstem Kingfisher Site
4 Project Stats Kingfisher Project (Completed 2014) Confluence Project (Completed 2014) Stream Length 550 Ft. 950 Ft. Area 2.5 Ac. 4.7 Ac. Flood Benefit 4X flood storage 13X flood storage o road closures Stream Slope 1.6 % 0.7 % Excavation Volume 8,700 CY 25,300 CY Construction Cost $ 1.4 million $ 5.6 million Stream Crossing 80 Pedestrian Bridge 33 X 60 Culvert 4
5 Design Approach: Restore natural processes Maximize floodplain, Q1.2 Avoid / relocate utilities Channel - over-excavate for hyporheic, wood! Incorporate surface and sub-surface flows Diverse planting wetland, floodplain & upland 5
6 Plunge Pool Design for Hyporheic Exchange Log 3 Surface Flow Subsurface Flow Downwelling Upwelling 6
7 Confluence: Pre-Project Conditions orth Branch South Branch Mainstem
8 Confluence: Design - Groundwater! - eighbors - Road Closure - Utilities!! South Branch orth Branch - Logs: Gravel: 1,800 CY - Wetlands: 1 Ac - Plants: 21,000 Mainstem
9 Confluence: Just Completed - Dynamic Stability
10 February 22, 2017 RRW Restoring Floodplain Capacity and Hyporheic Function in an Urban Setting Confluence: Flood Relief orth Branch South Branch Mainstem 10
11 Confluence: Jan, Diverse vegetation - Pools w/wood - Active floodplain & wetlands - Popular for walking
12 Confluence: Hyporheic Exchange Plunge Pool Downwelling Upwelling - Significant increase from pre-project - Diverse hyporheic patterns - Plunge pool driving exchange
13 Kingfisher: Pre-Project Conditions
14 Kingfisher: Design - Groundwater! - School access - Steep Slopes - Utilities Logs: 130 Gravel: 1,800 CY Plants: 10,000
15 Kingfisher: Just Completed
16 Kingfisher: Jan, 2017
17 Kingfisher: Hyporheic Exchange - Hyporheic flux: up to 1 m 3 /m 2 -d! - Diverse hyporheic patterns Plunge Pool Downwelling Upwelling
18 Hyporheic Temperature: - As much as 2 0 Celsius cooler in restored reaches - Add l cooling expected as veg grows (shade) Forested (R) = Reference Urban (K) = Kingfisher (F) = Confluence orth Fork (SF) = Confluence South Fork
19 Hyporheic Invertebrates (Food Supply): - Density & Richness 2-3X higher in restored reaches Forested (R) = Reference Urban (K) = Kingfisher (F) = Confluence orth Fork (SF) = Confluence South Fork
20 Kingfisher PIT tag detection results WHERE S THE FISH??? Confluence PIT tag detection results - Most fish in pools - Dot = 3 mo s presence - More full Kingfisher
21 Successful Floodplain Process Restoration ICREASED FLOOD STORAGE AD WETLADS COMPLEX I-CHAEL HABITAT AD HYDRAULICS COOLER WATER ICREASED FOOD SUPPLY VIBRAT DIVERSE VEGETATIO Stay Tuned future monitoring, movie 21
22 Big Thanks To: Paul Bakke, USFWS Hyporheic Concept & Monitoring Sarah Morley, Linda Rhodes, Anne Baxter - OAA Water Quality & Biological Monitoring Katherine Lynch, Seattle Public Utilities Fish Monitoring Shelly Solomon, Leaping Frog Films Images Seattle Public Utilities $$ - Design & Construction 22
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