Both case studies included development and application of decision support tools that quantitatively link climate, hydrology, water supply, water demand, and management actions. The first was an integrated, system dynamics model (using STELLATM software) constructed within a collaborative stakeholder process to address basin-scale aspects. The second focused on a sub-basin watershed serving the town of Peachland, and employed the WEAP model. The two cases differed in spatial and temporal resolution, and address somewhat different management questions. In the Peachland study, WEAP, an integrated water management model, was used to consider future scenarios for water supply and demand for an unregulated and for a reservoir-supported stream. The management components included an assessment of reservoir release strategies, and also assessed how well they could achieve in-stream flow requirements for supporting aquatic ecosystems. The basin-scale study included multiple management options for increasing supply or decreasing demand, and described the resulting reliability over the simulation period under different scenarios. In the two cases, selected climate change and population growth scenarios for the region are shown to negatively impact water supply reliability; however, certain management options could compensate and improve outcomes, thereby enabling adaptation to future climate change and population growth.