16Spring, 2018
Chart1
Environmental Site Design (ESD) 38%
Filtration 16%
Other 16%
Ponds 13%
Hydrodynamic Structures 12%
Underground Storage 5%
% Types of SWM Facilities
3338
1451
1372
1111
1060
410
Sheet1 (3)
Practice TypeNumberDescription
Environmental Site Design (ESD) 38%3,338Includes dry wells,
bios, microbios, raingardens, micro-infiltration trenches
Filtration 16%1451Includes surface sand filters and underground
sand filters, Infiltration trenches with quality and quantity
control, and buried surface
Other 16%1372Includes structure types not identified by an MDE
code, including stormfilters, aquafilters, aquaswirls,
bayseparator-flowsplitters, Snouts, Treeboxes, Vortecnics,
Vortsentry
Ponds 13%1111Includes dry ponds, extended det dryponds, wet
ponds, shallow marsh, infiltration basins with qual and quan
control
Hydrodynamic Structures 12%1060Includes Oil Grit Separators and
water quality inlets, Baysavers, stormceprtors
Underground Storage 5%410Includes underground storage vaults,
pipes, and storage pipes with infiltration
Total Number of Facilities8,762
Sheet1 (3)
% Types of SWM Facilities
Sheet1 (2)
Practice TypeCodeNumberDescription
Attenuation SwaleSW151Includes dry swales, wet swales, grass
swales, and ESDSW
BioretentionBR475Includes Bioretention, microbioretention
(ESDMB), and raingarden (ESDRG)
Detention StructureDP669Includes dry ponds
Dry WellDW2,383Includes dry wells, stormchambers, raintank, and
ESDDW
Environmental Site DesignESD234Includes Environmental Site
Design practices and Micro-infiltration trenches
Extended Detention, DryEDSD60Dry ponds with extended
detention
Extended Detention, WetEDSW157Wet ponds with extended
detention
Flow SplitterFLSP992
Hydrodynamic Structure: Oil Grit SeparatorOGS681Includes Oil
Grit Separators and water quality inlets
Hydrodynamic Structure: BaySaverBS138Baysavers
Hydrodynamic Structure: StormceptorSC241Stormceptors
Infiltration BasinIB60Includes infiltration basins with quality
and quantity control
Infiltration TrenchIT688Includes, infiltration trench with
quality and quantity control, and buried surface fed,
OtherOTH380Includes structure types not identified by an MDE
code, including stormfilters, aquafilters, aquaswirls,
bayseparator-flowsplitters, Snouts, Treeboxes, Vortecnics,
Vortsentry, and V2B1
Porous PavementPP95Includes porous concrete, asphalt, and
pavers, and ESDPERMP
Sand FilterSF783Includes surface sand filters and underground
sand filters
Shallow MarshSM120Includes all constructed wetlands, artificial
wetlands, shallow wetlands, and wetlands with extended
detention
Wet PondWP45Includes retention ponds and wet ponds
Underground StorageUGS410Includes underground storage vaults,
pipes, and storage pipes with infiltration
Total Number of Facilities8,762
Sheet1 (2)
Number
Sheet1
Practice TypeNumberDescription
Dry Well (ESD) 27%2,383Includes dry wells, stormchambers,
raintank, and ESDDW
Hydrodynamic Structures 12%1060Includes Oil Grit Separators and
water quality inlets, Baysavers, stormceprtors
Flow Splitter 11%992
Sand Filter 9%783Includes surface sand filters and underground
sand filters
Dry Ponds 8%729Includes dry ponds, extended det dryponds
Infiltration Trench 8%688Includes, infiltration trench with
quality and quantity control, and buried surface fed,
Bioretention (ESD) 5%475Includes Bioretention, microbioretention
(ESDMB), and raingarden (ESDRG)
Underground Storage 5%410Includes underground storage vaults,
pipes, and storage pipes with infiltration
Other 4%380Includes structure types not identified by an MDE
code, including stormfilters, aquafilters, aquaswirls,
bayseparator-flowsplitters, Snouts, Treeboxes, Vortecnics,
Vortsentry, and V2B1
Wet Ponds 4%322Wet ponds with extended detention, shallow marsh,
wet pond
Other Environmental Site Design 3%234Includes Environmental Site
Design practices and Micro-infiltration trenches
Attenuation Swale (ESD) 2%151Includes dry swales, wet swales,
grass swales, and ESDSW
Porous Pavement 2%95Includes porous concrete, asphalt, and
pavers, and ESDPERMP
Infiltration Basin 1%60Includes infiltration basins with quality
and quantity control
Total Number of Facilities8,762
Sheet1
% Types of SWM Facilities
Sheet2
