The province of BC uses four core indicators and additional supplemental indicators to establish:
- if there is a drought or a possibility of drought
- what the drought level is at a given point in time.
The province measures the following four indicators to establish whether there is a drought:
- Basin snow indices
- Seasonal volume runoff forecasts
- 30 percent of average precipitation
- 7-day average streamflow
The drought level is linked to a threshold established for each of the core indicators (see page 14 of the British Columbia Drought Response Plan).
In addition, the following supplemental indicators also help assess the situation.
- Aquifer levels
- Individual hydrometric station results
- Multi-year trends
- Reservoir inflows
- Wildfire danger class ratings
For more information:
Source: British Columbia Drought Response Plan, June 2010