Critical Period Management Tools - Edwards Aquifer Authority

Critical Period Management Tools

To better assist you in managing your groundwater withdrawal permit(s), the EAA has developed a full range of online critical period tools.

Notice of Intent to Finish Out a Crop (NIFC) Calculator

End of the Year Critical Period Calculator

Our interactive Critical Period Calculator allows you to determine how much water you need to have authorized to cover your total use and total critical period reductions for the year.

Please note, that this calculator is only available from December 31 to January 31, when we know the reductions for the year.

Use Calculator

Critical Period Calculator

Critical Period Calculator

Our auto-fill Critical Period Calculator allows you to accurately determine the authorized groundwater withdrawal amount available for use during times of mandatory critical period management.

Use Calculator

Critical Period Forecast Calculator

Critical Period Forecast Calculator

Our Interactive Critical Period Calculator allows you to predict and plan your groundwater withdrawal amount available for use during times of mandatory critical period management.

Use Calculator

Critical Period Usage Online Reporting System

Critical Period Usage Online Reporting System

This online form is available for users to submit their Critical Period Monthly Use Reports, as well as Annual Use Reports.

Online Report Form

EAA Meter Matters Smartphone App

EAA Meter Matters Smartphone App

This app allows users to report meter readings, manage meters and view meter reading history.

Critical Period

Critical Period Chart

Download Critical Period PDF


Notice of Intent to Finish a Crop Form

Attention irrigation permit holders, please download the Notice of Intent to Finish a Crop form here and submit no later than December 1st. Forms can be emailed to imartinez@edwardsaquifer.org or can be submitted electronically via the EAA’s Online Reporting System that can be found at https://www.edwardsaquifer.org/edwsoftware/other_user/login.

Critical Period Chart

Download Notice of Intent to Finish a Crop PDF

Due to the inclement weather the office will be closed on Tuesday, January 21, 2025.