Service Description: Polygon file showing optimized ecologically significant groundwater recharge areas

Service ItemId: 5934ba5b79754cef868d6148b9f44215

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Max Record Count: 1000

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• Ecologically Significant Groundwater Recharge Areas (ESGRAs) (0)

Description: (This is in DRAFT until the TRCA approval process is completed. ) ESGRA are areas of land that are responsible for replenishing groundwater systems that directly support sensitive areas like coldwater streams and wetlands (LSRCA, 2014).ESGRA methodology makes use of groundwater pathlines, tracked backward in time, originating from ecological features of interest. By tracking particles backward, ecological features that receive groundwater discharge (as predicted by the model) can be linked to areas on the land surface where discharging water originates (ORMGP, 2018). 1. ORMGP expanded York Tier 3 Water Balance Model to create TRCA Expanded Groundwater Flow Model (TEGWFM).2. Reverse particle tracking was used to determine recharge pathways for ecologically significant featuers.3. Various scenarios of mapping ESGRAs from particle endpoints were explored and ecological implications were evaluated.This optimized scenario consists of a particle density threshold (kernel density) of 0.004, with an aggregate distance of 100m, and a minimum size threshold of 0.5ha.Analysis was completed January - June 2019. Limited use for internal TRCA projects until approved. This layer should not be included in any external data requests without the knowledge and consent of the Reserach & Knowledge Management and Watershed Strategies groups.Please advise Daniela Macleod (GIS) and Neil Taylor (RKM) if inteding to use this file for any TRCA projects, or for questions about methodology and applications.

Copyright Text: TRCA

Spatial Reference: 26917 (26917)

Initial Extent:

XMin: 585385.576966898
YMin: 4840342.06558056
XMax: 654575.145632132
YMax: 4869595.00821476
Spatial Reference: 26917 (26917)

Full Extent:

XMin: 577931.665102005
YMin: 4828018.40570259
XMax: 662029.057497025
YMax: 4881918.66809273
Spatial Reference: 26917 (26917)

Units: esriMeters

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