July 14, 2025

Modeling Shared Water Rights in Reservoir Systems

 Posted by Jason Lillywhite

Managing water in the Western United States is a complex challenge, especially in shared reservoir systems governed by the "prior appropriation" doctrine. This legal framework determines who gets water, and when, based on their legal rights and the ever-changing natural water supply. Dynamic simulation is a tool that enables you to better understand this type of system and visualize its behavior, leading to clearer insights and more reliable predictions.



This guide outlines a methodology for simulating shared water rights within a reservoir using dynamic simulation, applicable to various modeling environments. While the concepts are demonstrated using an example model built in GoldSim (with full details and the model available here), the principles are broadly transferable to other platforms, such as Python.