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Triggering Criteria
The City of Greenville Water Conservation and Drought Contingency Plan establishes certain "triggers" that move progressively, from voluntary conservation to mandatory conservation stages. Once certain demand levels are reached, water conservation stages are triggered.
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
*Palmer Drought Severity Index
**Million Gallons per Day
Stage 1 Water Restrictions
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
*Palmer Drought Severity Index
**Million Gallons per Day
Stage 2 Water Restrictions
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
*Palmer Drought Severity Index
**Million Gallons per Day
Stage 3 Water Restrictions
REQUIREMENTS FOR INITIATION
When four of the triggering criteria in Stage 3 are met or when the City Manager declares a critical water shortage.
Stage 4 Water Restrictions
REQUIREMENTS FOR INITIATION
Stage 1
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
| City reservoir levels | 532.5' (sea level) and falling |
|---|---|
| Lake Tawakoni level | 434' and falling |
| PDSI* | Moderate drought (-2.0 to -2.9) |
| Reservoir recharge frequency | Two times in the past 12 months |
| Water Demand | 60% of Water Production Plant capacity (7.8 MGD**) |
**Million Gallons per Day
Stage 1 Water Restrictions
Stage 2
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
| City reservoir levels | 531.5' (sea level) and falling |
|---|---|
| Lake Tawakoni level | 432' and falling |
| PDSI* | Severe drought (-3.0 to -3.9) |
| Reservoir recharge frequency | One time in the past 12 months |
| Water Demand | 70% of Water Production Plant capacity (9.1 MGD**) |
**Million Gallons per Day
Stage 2 Water Restrictions
Stage 3
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
| City reservoir levels | 531.5' (sea level) and falling |
|---|---|
| Lake Tawakoni level | 431' and falling |
| PDSI* | Extreme drought (-4.0 or less) |
| Reservoir recharge frequency | Zero times in the past 12 months |
| Water Demand | 80% of Water Production Plant capacity (10.4 MGD**) |
**Million Gallons per Day
Stage 3 Water Restrictions
Stage 4
REQUIREMENTS FOR INITIATION
When four of the triggering criteria in Stage 3 are met or when the City Manager declares a critical water shortage.
Stage 4 Water Restrictions
Stage 5
REQUIREMENTS FOR INITIATION
- When all five of the triggering criteria in Stage 3 are met
- Major water line breaks, or pump or system failures occur, which cause unprecedented loss of capability to provide water service
- Natural or man-made contamination of the water supply source(s)