Description

This polygon layer presents 7‑day and 10‑day accumulated precipitation forecasts from the Global Deterministic Prediction System (GDPS), aggregated by sub-basin. It is designed to help hydrologists, water resource managers, and emergency planners pinpoint watersheds facing higher rainfall or snowfall totals in the medium-to-long range, enabling proactive flood risk assessment, drought monitoring, and resource allocation. Developed by Environment and Climate Change Canada (ECCC), the GDPS is a global numerical weather prediction model running at approximately 15km resolution, updated twice daily (00Z and 12Z). This layer integrates 168-hour (7‑day) and 240-hour (10‑day) precipitation forecasts into sub-basin polygons, offering a comprehensive view of expected cumulative precipitation. By focusing on watershed boundaries, decision-makers can quickly gauge regional vulnerabilities to prolonged rainfall or snowfall events.Key highlights: Global Model Insight: Captures large-scale, multi-day weather systems (e.g., atmospheric rivers, persistent low-pressure systems). Sub-Basin Aggregation: Delivers averaged precip values per basin, simplifying hydrological analysis for flood or drought outlooks. Extended Outlook: Spanning from day 0 to day 10, covers both medium- and longer-term forecast horizons, essential for strategic planning and mitigation efforts. Typical Uses:Flood Forecasting – Identifying basins prone to heavy or prolonged precipitation. Water Resource Management – Adjusting reservoir release schedules or irrigation planning based on expected accumulations. Emergency Preparedness – Deploying resources or issuing advisories in vulnerable watersheds.

Resources

Name	Format	Description	Link
CSV	CSV		https://geoportal.gov.mb.ca/api/download/v1/items/24b11a375afa475d9925d705fdb14e11/csv?layers=0
GeoJSON	GeoJSON		https://geoportal.gov.mb.ca/api/download/v1/items/24b11a375afa475d9925d705fdb14e11/geojson?layers=0
KML	KML		https://geoportal.gov.mb.ca/api/download/v1/items/24b11a375afa475d9925d705fdb14e11/kml?layers=0
Shapefile	ESRI Shape		https://geoportal.gov.mb.ca/api/download/v1/items/24b11a375afa475d9925d705fdb14e11/shapefile?layers=0
original metadata (https://geoportal.gov.mb.ca)	HTML		https://geoportal.gov.mb.ca/datasets/manitoba::forecasted-basin-average-accumulated-precipitation-gdps-168-hrs-240-hrs
ArcGIS GeoService	Ersi REST		https://services.arcgis.com/mMUesHYPkXjaFGfS/arcgis/rest/services/GDPS_SubBasins_Precipitation_Distribution_168_hrs__240_hrs/FeatureServer/0
ArcGIS GeoService	Ersi REST		https://services.arcgis.com/mMUesHYPkXjaFGfS/arcgis/rest/services/GDPS_SubBasins_Precipitation_Distribution_168_hrs__240_hrs/FeatureServer/0

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