Water Resources Program  |  COB Biofilter
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Most of the runoff from Albemarle County's downtown office building and parking lots currently flows unattenuated and untreated into an underground culvert system which discharges directly into Schenks Branch, an urban tributary of Meadow Creek – currently listed in Virginia’s 305(b)/303(d) report as impaired due to e. coli and fecal coliform.

This project involves the construction of a vegetated biofilter to capture and treat runoff from 1.5 acres of the lower parking lot - adjacent to the baseball field.  The project has been designed in conjunction with a planned pedestrian greenway that would link the Schenks Branch greenway to downtown.  Due to its connection to the greenway and its proximity to a major entrance corridor to the downtown area, the project will include a significant educational element, including signage, visitor tours, and publicity.

The project includes the reconstruction of parking lot trench drains to direct runoff into the biofilter, an underdrain system, and a variety of native vegetation for both function and aesthetics.

COB parking lot biofilter concept

Designed by Anhold Associates.

COB Biofilter Plan Set  (7,370 KB)

 - construction drawings for COB Parking Lot Biofilter Project

Contractor: Digs, Inc.


PHOTO LOG

before construction; underground gas line marked with yellow flags (April 11)
biofilter area before construction

early excavation of biofilter area (April 20)
early excavation of biofilter area

the biofilter begins to take shape (April 26)
the biofilter begins to take shape

precast endwall and stone retaining walls of drainage channel (May 19)
precast endwall and stone retaining walls of drainage channel

 

soil mix is placed over gravel underdrain (July 11)
soil mix is placed over gravel underdrain

 

biofilter nearly complete (Aug 1)
biofilter nearly complete

 

rock channel which conveys stormwater from farthest trench drain (Aug 11)
rock channel which conveys stormwater from farthest trench drain

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