The Potential of Subsurface Infiltration for the Treatment ...
The Capitol Subsurface Infiltration Gallery
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The Capitol Subsurface Infiltration Gallery SCVURPPP Green Stormwater Infrastructure Planning November 29, 2018 Robin Lee, PE Agenda: Project Overview Initial Pump Design Revised Design Lessons Learned Construction Pics Questions
Transcript of The Capitol Subsurface Infiltration Gallery
The Capitol Subsurface Infiltration GallerySCVURPPP Green Stormwater Infrastructure Planning
November 29, 2018
Robin Lee, PE
Agenda:
Project OverviewInitial Pump DesignRevised DesignLessons Learned Construction PicsQuestions
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The Project:
10.32 acresResidentialRetail/CommercialStorage
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Site Plan
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Initial Design:
90’x 56’ vault12’ tallPump to bioretentionBio sized on pump rate2,300 sf treatment
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Bird’s Eye
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Cross Section
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Revised Design:
Perc. Rate – 30in/hr10-ft below gradeOpen bottom vaultC3 = infiltration42’ x 90’ 6’ tall25% smaller footprint
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Percolation does NOT equal Infiltration!
Percolation Rate = 30 in/hr
Infiltration rate = 9 in/hr
Factor of Safety = 2.5
Infiltration
Percolation
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BAHM Reduction Factor
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Site Plan
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Bird’s Eye
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Profile
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Cross Section
125.9’3.9’ ponds and infiltrates
Water Quality Volume0.45 ac-feet required 0.57 ac-feet provided
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Vault System
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Weir Plate Design
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Excavation
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Light Compaction
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Gravel Layer & Vaults
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Questions
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Project Partners
