Name: Significant Surface Water Contribution Areas
Display Field: OBJECTID
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Entity Name: SW Significant Groundwater Recharge AreaTable Name: SignificantGroundwaterRechargeAreaAn 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 NAMEDATATYPEREQDESCRIPTION1OBJECTIDOBJECTIDNUMBER(13)YesA unique numeric identifier assigned to each feature.2Source Protection Area IDSPP_IDNUMBER(2)YesIdentifier for the source protection area that provided the original data about the feature. SPP_ID values range from 0 to 48 chosen from Lookup Table: SOURCE_PROT_AREA_LIST.3Vulnerability ScoreVULNERABILITY_SCORENUMBER(1)YesRanges from 2, 4 or 6, with 6 being most vulnerable. Technical rules outline how to assign this, typically based on the Time of Travel zone and/or the relative Vulnerability Level.4Effective DatetimeEFFECTIVE_DATETIMEDATEYesDate/time the record was created or last modified in the source database.5SHAPESHAPESDO_GEOMETRYYesGeometry attribute.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.