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TRSPA_SWP_Significant_Groundwater_Recharge_Areas (FeatureServer)

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Service Description: Polygon file displaying significant groundwater recharge areas (SGRA) across the Toronto and Region Source Protection Area (TRSPA). SGRAs have permeable soils such as sand or gravel that allow the water to soak easily into the ground. Under the Clean Water Act, 2006, a recharge area is considered significant when it helps maintain the water level in an aquifer that supplies drinking water (including private wells), and has higher than average recharge across the Source Protection Area.

Service ItemId: 5a79c7ca7a6e490bb3def5b519203e83

Has Versioned Data: false

Max Record Count: 2000

Supported query Formats: JSON

Supports applyEdits with GlobalIds: False

Supports Shared Templates: True

All Layers and Tables

Layers:

Description:

Entity Name: SWP Significant Groundwater Recharge Area

Table Name: SWP_SIGNIF_GW_RECHARGE_AREA_FT

An area can be considered a significant groundwater recharge area if (1) the area annually recharges water to the underlying aquifer at a rate that is greater than the rate of recharge across the whole of the related groundwater recharge area by a factor of 1.15 or more; or (2) the area annually recharges a volume of water to the underlying aquifer that is 55% or more of the volume determined by subtracting the annual evapotranspiration for the whole of the related groundwater recharge area from the annual precipitation for the whole of the related groundwater recharge area.

#

ATTRIBUTE/COLUMN NAME

DATATYPE

REQ

DESCRIPTION

1

OGF ID

OBJECTID

NUMBER(13)

Yes

A unique numeric provincial identifier assigned to each object.

2

Source Protection Area ID

SPA_ID

NUMBER(2)

Yes

Identifier for the source protection area that provided the original data about the feature.

Clipping SGRAs

The jurisdictional identification of SGRA was approved by the SPC. However, Technical Rule (45) requires that “an area shall NOT be delineated as a SGRA area unless the area has a hydrological connection to a surface water body or aquifer that is a source of drinking water for a drinking water system.” This includes private systems (O. Reg. 170/03). This Technical Rule introduces the idea of clipping out SGRAs that are of no significance from a drinking water point of view, since it would not make practical sense to protect them. These areas may be important in other contexts, but they are not considered significant under the CWA. In the CTC Region, the SGRA located within the municipal service boundary that are on the Lake Ontario shoreline and sourced from Lake Ontario have been clipped out if no drinking water systems (as defined in the Safe Drinking Water Act, 2002) depend on those SGRAs.



Copyright Text: TRCA, TRSPA

Spatial Reference: 26917 (26917)

Initial Extent:
Full Extent:
Units: esriMeters

Child Resources:   Info   SharedTemplates

Supported Operations:   Query   ConvertFormat   Get Estimates