40C-21.221. Monitoring and Evaluating Water Conditions  


Effective on Thursday, August 23, 2018
  • 1(1) This rule sets forth the manner in which the District will periodically evaluate water conditions within the District. Data thereby generated assists the District in determining whether and to what extent a water shortage should be declared.

    39(2) Monitoring data – Water data and water demand data will be obtained from any source of information needed to evaluate the following:

    62(a) Drought Indicators shown in Table 21-1.

    69(b) Current regional 72surface water flows 75and lake levels and their relationship to low normal values.

    85(c) Current and recent values of the U.S. Drought Monitor for the National Drought Mitigation Center.

    101(d) Current precipitation outlooks from the Climate Prediction Center of the National Oceanic and Atmospheric Administration’s National Weather Service.

    120(e) Public supply storage status.

    125(3) In evaluating whether or not a Water Shortage or Water Shortage Emergency should be declared, the following evaluation process is followed:

    147(a) The District will compare current data to values for specific Drought Indicators as shown in Table 21-1.

    165(b) The District will compile these comparisons and consider Drought Condition Levels as shown in Table 21-2 and the factors identified in paragraphs 18840C-21.251(4)(a)-189(i), F.A.C., to determine the appropriate Drought Condition Level.

    198(c) This evaluation will occur on at least a monthly basis.

    209TABLE 21-1: Drought Indicators

    213DROUGHT INDICATOR VALUE

    216REGIONAL RAINFALL

    218(12-Month Moving Sum)

    221REGIONAL RAINFALL

    223(24-Month Moving Sum)

    226GROUND WATER LEVELS*

    229Moderate

    23012-month rainfall at or below: 40 inches

    23724-month rainfall at or below: 84 inches

    244At or below 15th percentile

    249Severe

    25012-month rainfall

    252at or below: 35 inches

    25724-month rainfall

    259at or below: 79 inches

    264At or below 10th percentile

    269Extreme

    27012-month rainfall

    272at or below: 30 inches or 4-week duration of rainfall at or below the severe indicator

    28824-month rainfall

    290at or below: 74 inches or 4-week duration of rainfall at or below the severe indicator

    306At or below 10th percentile for greater than 4 weeks

    316Critical

    31712-month rainfall

    319at or below: 25 inches or 8-week duration of rainfall at or below severe indicator

    33424-month rainfall

    336at or below: 69 inches or 8-week duration at or below severe indicator

    349At or below 10th percentile for greater than 8 weeks

    359* Calculated based on at least 30 years of historical data

    370TABLE 21-2: 372Drought Condition Levels

    375Drought Condition Level

    378Drought Indicator Values

    381Moderate

    382At least two Drought Indicator Values are Moderate

    390Severe

    391All Drought Indicator Values are Moderate or at least one is Severe

    403Extreme

    404Two or more Drought Indicator Values are Severe or at least one is Extreme

    418Critical

    419Two or more Drought Indicator Values are Extreme or at least one is Critical

    433Rulemaking Authority 435373.044, 436373.113 FS. 438Law Implemented 440373.175, 441373.246 FS. 443History–New 1-1-84, Amended 9-16-92, 6-7-93, 8-23-18.

     

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