EcoHydroData Hub: https://ecohydrohub.github.io/
MERIT Hydro: MERIT Hydro Dataset
HydroSHEDS Data: hydrosheds.org/products
GLHYMPS (Global Hydrogeology Maps): Gleeson et al. 2014 – GLHYMPS
CVHM2 Model: USGS Central Valley Hydrologic Model 2 (CVHM2)