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2025 Critical Period Forecast Calculator

This auto-fill calculator allows you to accurately determine your authorized groundwater withdrawal amount for the current total number of days that a stage of Critical Period Management (CPM) has been in effect in the San Antonio and Uvalde Pools. To use, simply select the pool for your area along with the corresponding year of critical period and the program will automatically display the stage(s), number of days, and applicable reduction rates. To calculate your accurate reduction, enter your annual authorized groundwater withdrawal amount in the appropriate box and click the Calculate button. Your new authorized amount is displayed in red. Reset the calculator each time to repeat the process as necessary. If you wish to forecast your possible end-of-year reduction please use the Critical Period Forecast Calculator or the Interactive Critical Period Calculator if you are an irrigation user who has filed a Notice of Intent to Finish Out a Crop form.

CPM FORECAST CALCULATOR

Select

Enter Authorized Amount For Permit:

Estimate Total Days For This Year In No Stage:

Estimate Total Days For This Year In Stage I:

Estimate Total Days For This Year In Stage II:

Estimate Total Days For This Year In Stage III:

Estimate Total Days For This Year In Stage IV:

Estimate Total Days For This Year In Stage V:

CALCULATED DATA

Authoried Amount Before Reductions	Pending
Current Critical Period Reduction	Pending
New Author Amount After Reduction	Pending

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Helpful Calculation Data

Days so far this year	109
Days remaining this year	256
SA POOL
Days in current stage
Days remaining this year	256
Total days in this stage, if stage continues the remainder of this year
Uvalde Pool
Days in current stage
Days remaining this year	256
Total days in this stage, if stage continues the remainder of this year