Utah State University Extension
The DROUGHT database is based on an extensive review of literature of the water requirements for woody plants adapted to the Northern Utah region. It is intended to increase the resources available to the public to incorporate water efficient principles and plants into the urban landscape. It differs from other lists of plant water requirements in that it is a review of the published literature including citations of previous research and observations. The need for a documented review is apparent as one studies the database. It can be seen that much of the water use assessments used by the industry are based on general observations and are necessarily somewhat subjective.
Cook, Samuel and Rupp, Larry, "Drought Tolerance A Database of Irrigation Requirements for Woody Plants of Northern Utah" (2011). CWEL Extension Fact Sheets. Paper 7.