INITIAL LONG LIST OF ALTERNATIVES€¦ · INITIAL LONG LIST OF ALTERNATIVES Alternatives can be grouped into 4 functional categories, based on the point at which they intercept rainwater

INITIAL LONG LIST OF ALTERNATIVES

Alternatives can be grouped into 4 functional categories, based on the point at which they intercept rainwater and stormwater runoff. These categories include:

• Source Controls• Conveyance Controls• End-of-Pipe Controls• Restoration Measures

SOURCE CONTROL MEASURES

Directly Connected Downspout

Source Control Measures are physical measures that are located at the beginning of a drainage system, generally on private property

RAIN BARREL

RAIN GARDEN

SOAK-AWAY PIT

PERVIOUS DRIVEWAY

BIOFILTERS IN PARKING LOTS

ROOFTOP GARDENS

CONVEYANCE CONTROL MEASURES

Conveyance Control Measures are physical measures that are located within the road right-of-way

SWALE / DITCHES

PERVIOUS PIPE SYSTEM

PERVIOUS PIPE SYSTEM (continued)

Infiltration/ExfiltrationInfiltration/ExfiltrationSystemsSystems

OFF-LINE STORAGE

TYPICAL ARRANGEMENT FOROFF-LINE STORAGE FACILITY

DRAIN PIPE

STORAGE PROVIDEDBELOW BASEMENT ELEVATION

TO REDUCE FLOOD RISK

BACKFLOWVALVE

EXISTING STORM SEWER

EXISTINGMANHOLE

INFLOWPIPE

GROUND SURFACE

OFF-LINE STORAGE FACILITY

NEWMANHOLE

END-OF-PIPE MEASURES

End-of-Pipe Measures occur at the end of a flow conveyance system.

DRY POND

WET POND

INFILTRATION BASINS

STREAM RESTORATION

MEASURES

Before

After

Restoration Measures are implemented to restore degraded habitat. These measures may be used to restore streams, wetlands or other habitat

NEXT STEP

• Input from tonight’s meeting will be taken into consideration

• GRIDS land use scenarios will be further developed

• Targetted workshops will be held• Management Strategies will be developed