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.
Stage 1
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
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**)
*Palmer Drought Severity Index Stage 1 Water Restrictions
Stage 2
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
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**)
*Palmer Drought Severity Index Stage 2 Water Restrictions
Stage 3
REQUIREMENTS FOR INITIATION
When two or more of the following criteria are met:
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**)
*Palmer Drought Severity Index 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)
Stage 5 Water Restrictions
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