SubsetTools: A Python package to subset data to build and run ParFlow hydrologic models

Hydrologic models are an integral part of understanding and managing water supply.There are countless hydrologic models available that differ in their complexity, scale and focus on different parts of the hydrologic cycle.ParFlow is a fully integrated, physics-based model that simulates surface and subsurface flow simultaneously (Ashby & Falgout, 1996;Jones & Woodward, 2001;Kollet & Maxwell, 2006;Maxwell, 2013).ParFlow is also coupled with a land surface model which allows it to simulate the full terrestrial hydrologic cycle from bedrock to treetops (Kollet & Maxwell, 2008;Maxwell & Miller, 2005).It has been applied to a myriad of watersheds across the US and around the world to answer questions of water supply and groundwater-surface water interactions.