In 2014 and 2015 LRE worked with the Colorado Division of Water Resources to build the State’s Alluvial Aquifer Accretions and Depletions Analysis Tool (AAADAT).  This groundbreaking tool uses official diversion records to estimate stream impacts of off-stream diversions (wells) and recharge ponds and provides a daily accounting of these impacts to connected river reaches.  With this tool, river administrators can calculate whether or not total accretions in a river reach fall short of, meet or exceed depletions.  In the case of a shortfall, this tool empowers administrators to take timely action to protect senior water rights, when historically the knowledge of these shortfalls would come weeks too late to be acted upon.  This tool will also allow for the daily accounting of “excess accretions” which may be developed into a legally available water source for future storage projects or fuel innovation around “water banking” projects.

WHY IS THIS TOOL NECESSARY? CAN’T YOU JUST USE THE DECREED ACCOUNTING? Accounting is much more complicated than the simple mathematical computations accomplished by AAADAT and, therefore, is typically not available until many weeks after the diversion or recharge. That delay prevents the accounting from being used to effect administration. Even if the accounting is maintained completely up to date on a day by day basis, the Division of Water Resources typically does not have the staff to review the accounting in time to effect administration. With this tool, as soon as the diversion record is submitted, the water commissioner can know the daily stream impact associated with that diversion for the rest of the irrigation year and use it to effect administration.

~AAADAT IS NOT ACCOUNTING nor is it a substitute for any Division required accounting. ~

WHO IS RESPONSIBLE FOR DATA INPUT? Water users or water administrators. This tool is designed to interface with HydroBase. HydroBase is the central database that houses real-time, historic and geographic data related to water resources in Colorado. Water users who want to input data into HydroBase for AAADAT should contact their water commissioner.

WHO CAN VIEW AAADAT DATA AND REPORTS? Anyone with internet access.

WHAT ARE THE MAIN FEATURES OF AAADAT? The AAADAT tool functions are divided into four categories: Reports, Upload, Lagging and Review.  Each of these categories have sub-functions which are explained in more detail on the Home page.

Reports – Two types of accretion/depletion reports can run: 1) Near-term, daily impacts reports or 2) Monthly remaining impacts reports. Lagged accretions and depletions are calculated by AAADAT separately for each Water Class in the system, and these reports pull together the lagged impacts results for groups of water classes.  Groups at a minimum include a single structure, all structures in an augmentation reach, or all structures in an augmentation plan.  Custom grouping of water classes for reporting may be supported in the future.

Upload – AAADAT requires three data sets for every Water Class in order to calculate a time series of lagged impacts: 1) Lagging Function, 2) Current Year Diversions and 3) Historical impacts (already lagged) for the current year.  All three of these data sets will be user-loadable through the DWR’s online data loading tool.  The AAADAT site will provide instructions on how to prepare data for loading, and links to the loading pages in that separate tool.

Lagging – AAADAT will be scheduled at a minimum to lag all water class data each night.  This will provide quick access to reports that are current through the previous day.  Depending on the performance impact of this full lagging run, AAADAT may be scheduled to run in full at other times throughout the day as well.  If users wish to upload new diversion data and have it reflected in a report right away (rather than waiting until the next scheduled AAADAT run), they may request a run for a specific subgroup of water classes (either by single Structure, a plan reach, or a whole augmentation plan).

Review – AAADAT relies fully on HydroBase data to inform the program on the associations between water classes, structures, plans and reaches.  The Reivew section of the AAADAT tool allows the user to view and check the setup of these data in HydroBase.  Changes may not be made through the interface, but on-screen guidance will be provided to inform users of how to coordinate with DWR to make additions or changes to their system’s representation in HydroBase.