Florida Regulations 40D-21.221: Evaluating Water Conditions
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(1) The District shall consider the data collected by the District as described in Fl. Admin. Code R. 40D-21.211, in determining:
(a) Whether a Water Shortage or Water Shortage Emergency should be declared in light of existing or projected conditions and anticipated durations thereof;
(b) Whether the restrictions and other response mechanisms in effect are being adequately enforced; and
(c) Whether an existing order issued pursuant to this chapter should be modified or rescinded in light of existing and/or anticipated conditions.
(2) Regional condition data may represent the entire District or any portion thereof. Individual Drought Indicators and Drought Condition Levels shall be decision-making tools, not values that will automatically trigger a District response.
(3) In evaluating whether or not a Water Shortage or Water Shortage Emergency should be declared, the following evaluation process is followed:
(a) The District will compare current data to predetermined values for specific Drought Indicators as shown in Table 21-1.
(b) The District will compile these comparisons to determine the appropriate Drought Condition Level. Specifically, the combination of values for regional Drought Indicators shall be assessed in relation to the matrix shown in Table 21-2;
(c) This evaluation will occur on at least a monthly basis;
(d) Results of this evaluation will be reported to the Board and the Executive Director as needed.
TABLE 21-1: Drought Indicators
Drought
Indicator
Value
REGIONAL RAINFALL
(12-Month Moving Sum)
REGIONAL RAINFALL
(24-Month Moving Sum)
CURRENT STREAM-FLOW (7-Day
Moving Average)
AVERAGE STREAM-FLOW (8-Week
Moving Average)
AQUIFER RESOURCE INDICATOR
Moderately Abnormal
21st to 25th percentile
21st to 25th percentile
21st to 25th percentile
21st to 25th percentile
16th to 25th percentile
Severely Abnormal
11th to 20th percentile
11th to 20th percentile
11th to 20th percentile
11th to 20th percentile
16th to 25th percentile for 4 weeks
*or* below the 16th percentile
Extremely Abnormal
6th to 10th percentile
6th to 10th Percentile
6th to 10th percentile
6th to 10th percentile
Below the 16th percentile for 4 weeks
Critically Abnormal
5th percentile or less
5th percentile or less
5th percentile or less
5th percentile or less
Below the 16th percentile for 8 weeks
(a) Whether a Water Shortage or Water Shortage Emergency should be declared in light of existing or projected conditions and anticipated durations thereof;
(b) Whether the restrictions and other response mechanisms in effect are being adequately enforced; and
(c) Whether an existing order issued pursuant to this chapter should be modified or rescinded in light of existing and/or anticipated conditions.
(2) Regional condition data may represent the entire District or any portion thereof. Individual Drought Indicators and Drought Condition Levels shall be decision-making tools, not values that will automatically trigger a District response.
(3) In evaluating whether or not a Water Shortage or Water Shortage Emergency should be declared, the following evaluation process is followed:
(a) The District will compare current data to predetermined values for specific Drought Indicators as shown in Table 21-1.
(b) The District will compile these comparisons to determine the appropriate Drought Condition Level. Specifically, the combination of values for regional Drought Indicators shall be assessed in relation to the matrix shown in Table 21-2;
(c) This evaluation will occur on at least a monthly basis;
(d) Results of this evaluation will be reported to the Board and the Executive Director as needed.
TABLE 21-1: Drought Indicators
Drought
Indicator
Value
REGIONAL RAINFALL
(12-Month Moving Sum)
REGIONAL RAINFALL
(24-Month Moving Sum)
CURRENT STREAM-FLOW (7-Day
Moving Average)
AVERAGE STREAM-FLOW (8-Week
Moving Average)
AQUIFER RESOURCE INDICATOR
Moderately Abnormal
21st to 25th percentile
21st to 25th percentile
21st to 25th percentile
21st to 25th percentile
16th to 25th percentile
Severely Abnormal
11th to 20th percentile
11th to 20th percentile
11th to 20th percentile
11th to 20th percentile
16th to 25th percentile for 4 weeks
*or* below the 16th percentile
Extremely Abnormal
6th to 10th percentile
6th to 10th Percentile
6th to 10th percentile
6th to 10th percentile
Below the 16th percentile for 4 weeks
Critically Abnormal
5th percentile or less
5th percentile or less
5th percentile or less
5th percentile or less
Below the 16th percentile for 8 weeks
TABLE 21-2: Drought Condition Levels
Drought Condition Level
If this is true …
Moderate
At least one Drought Indicator is Moderately Abnormal
Severe
Multiple Drought Indicators are Moderately Abnormal or one is Severely Abnormal
Extreme
Multiple Drought Indicators are Severely Abnormal or one is Extremely Abnormal
Critical
Multiple Drought Indicators are Extremely Abnormal or at least one is Critically
Abnormal
Rulemaking Authority 373.044, 373.113 FS. Law Implemented 373.175, 373.246 FS. History-New 11-19-84, Amended 4-9-06, 7-5-12.