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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Initial Design:
90’x 56’ vault12’ tallPump to bioretentionBio sized on pump rate2,300 sf treatment
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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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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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