In the state of Colorado water that is transported into another basin can be used to extinction, and no return flows to streams are required.  Water applied to urban landscapes in the Denver region is largely of trans-basin water.  Therefore, municipalities wish to understand the fate of applied outdoor water.  It has been established using lysimeters that a portion of the water applied to Kentucky bluegrass lawns passes through the soil an into underlying aquifers and can be recaptured for future use.  However, the processes of water storage, use and recharge beneath urban tree canopies are unknown.  Ph.D. student Ed Gage is pursuing this topic in collaboration with the City of Aurora Utilities Department and Deere and Ault Consultants.  Ed is monitoring weather variables, precipitation and water application via sprinklers, soil water storage, tree xylem sap flux, tree xylem pressure potential both on his study sites and regionally, soil water recharge in lysimeters, and other topics to construct site water budgets for 5 City of Aurora park sites.