2020 Critical Period Forecast Calculator

This auto-fill calculator allows you to predict your possible end-of-year authorized groundwater withdrawal amount by allowing you to forecast future critical period days while also taking into account the current total number of days a Critical Period Management (CMP) Stage has been in effect in the San Antonio and Uvalde Pools. To use, simply select the pool for your area, and the program will automatically display the stages and applicable reduction rates to date. To calculate your reduction, enter your authorized groundwater withdrawal amount, then enter the current total number of days a Stage of CPM has been in effect in the appropriate CPM Stage fields (as displayed on the table to the right) and add the total number of days that are left within the year in the CPM Stage fields as you predict that they may occur, once complete click the Calculate button. Your new authorized amount is displayed in red. Reset the calculator each time to repeat the process as necessary.



Calculated Data
Authorized Amount Before Reductions Pending acre-ft.
Current Critical Period Reduction Pending acre-ft.
New Authorized Amount After Reduction Pending acre-ft.

Helpful Calculation Data

Days so far this year 224
Days remaining this year 142
SA Pool
Days in current stage 34
Days between current stage start and year end 174
Uvalde Pool
Days in current stage 224
Days between current stage start and year end 364
SA Pool
Stage % Days in Stage Start End Reduction
Stage 1 20.0% 34 07/09/2020 08/11/2020 1.86%
34 1.86%
Uvalde Pool
Stage % Days in Stage Start End Reduction
No Stage 0.0% 224 01/01/2020 08/11/2020 0%
224 0%