Lot 10 Bioretention Planter
This parking lot has two large bioretention planters. Watch out for traffic in the lot if you decide to take a closer look.
Bioretention Planters
In bioretention planters, stormwater is treated as it passes through a layer of compost-amended soil (see diagram below). In small storms, the filtered water collects in the gravel layer at the bottom and infiltrates into the soil. In larger storms, the gravel layer fills up and filtered water is carried away by a buried perforated pipe (underdrain) to the concrete drain inlet (the box with a metal grate). In a very large storm, the planter fills up and overflows into the top of the concrete drain inlet.
The Lot 10 planters are sized larger than those in Lot 7 to capture and treat a larger volume of runoff. A rough rule of thumb is the planter area should be about 4 percent of the drainage area.
Want more details? https://www.owp.csus.edu/csus-lid/
Fitting Planters into the Existing Drain System
New parking lots can be graded toward the outside edges so that stormwater BMPs can be incorporated into the perimeter landscaping. Retrofitting BMPs into existing lots, however, requires that they be placed where the drainage allows. In Lot 7, the planters were located around existing storm drain inlets. Here in Lot 10, runoff drains to a valley gutter in the middle of the drive aisle. This layout required the LID BMPs to be placed uphill from the gutter, resulting in a planter that is fairly deep on one side.
Minimizing the Loss of Parking Stalls
Parking stalls are valuable. (Ask any student who is late for class.) If the existing drainage system is on the interior of the lot, LID BMPs displace parking. As shown in the diagram below, 13 parking stalls were converted to one of the Lot 10 planters. Parking on campus is so valuable that this LID BMP was notched to save just one stall.
These are the plants at this BMP Site:
Featured Plant
Blue Eyed Grass (Sisyrinchium Bellum)
Sisyrinchium Bellum: Image by: Curtis Clark (Creative Commons Attribution-Share Alike 2.5 Generic)
Berkeley Sedge (Carex Divulsa)
Lomandra (Lomandra Longfolia 'Breeze')
Deer Grass (Muhlenbergia Rigens)
Want more details? https://www.owp.csus.edu/csus-lid/
Bioretention Planters
In bioretention planters, stormwater is treated as it passes through a layer of compost-amended soil (see diagram below). In small storms, the filtered water collects in the gravel layer at the bottom and infiltrates into the soil. In larger storms, the gravel layer fills up and filtered water is carried away by a buried perforated pipe (underdrain) to the concrete drain inlet (the box with a metal grate). In a very large storm, the planter fills up and overflows into the top of the concrete drain inlet.
The Lot 10 planters are sized larger than those in Lot 7 to capture and treat a larger volume of runoff. A rough rule of thumb is the planter area should be about 4 percent of the drainage area.
Want more details? https://www.owp.csus.edu/csus-lid/
Click here for more details on bioretention planters.
Fitting Planters into the Existing Drain System
New parking lots can be graded toward the outside edges so that stormwater BMPs can be incorporated into the perimeter landscaping. Retrofitting BMPs into existing lots, however, requires that they be placed where the drainage allows. In Lot 7, the planters were located around existing storm drain inlets. Here in Lot 10, runoff drains to a valley gutter in the middle of the drive aisle. This layout required the LID BMPs to be placed uphill from the gutter, resulting in a planter that is fairly deep on one side.
Minimizing the Loss of Parking Stalls
Parking stalls are valuable. (Ask any student who is late for class.) If the existing drainage system is on the interior of the lot, LID BMPs displace parking. As shown in the diagram below, 13 parking stalls were converted to one of the Lot 10 planters. Parking on campus is so valuable that this LID BMP was notched to save just one stall.
These are the plants at this BMP Site:
Featured Plant
Blue Eyed Grass (Sisyrinchium Bellum)
Sisyrinchium Bellum: Image by: Curtis Clark (Creative Commons Attribution-Share Alike 2.5 Generic)
Berkeley Sedge (Carex Divulsa)
Lomandra (Lomandra Longfolia 'Breeze')
Deer Grass (Muhlenbergia Rigens)
Want more details? https://www.owp.csus.edu/csus-lid/