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The drought conditions in the Navajo Nation are severe to exceptional, and observed across the more than 70,000 square kilometers. The Navajo Nation is the largest land-based tribe in the United States that experiences impacts brought on by subtle changes in precipitation. Evaluation of precipitation from 2002 to 2015 water...

In forested basins, the amount of snow that accumulates on the ground depends on how much snowfall is intercepted in the forest canopy and the subsequent partitioning of canopy snow into sublimation, unloading, and melt drip. However, the amount of precipitation intercepted in forest canopies is rarely measured, and existing...

Given the importance of groundwater in sustaining Upper Colorado River Basin (UCRB) streamflow (over 50% of streamflow originates as baseflow), effective management of water resources in the basin requires estimates of how baseflow may change under projected climatic changes. We applied projections of future climate to a calibrated hybrid statistical-deterministic...

The algae have a marketing problem. While the scientific community may appreciate the important roles algae play as the base of the food chain in aquatic ecosystems, their contributions to global CO2-O2 cycling and practical applications are less understood. The messages the general public receives about algae are in the...

Integrated water resources planning is an example of a large-scale, long-term infrastructure planning problem that is impacted by climate change and multiple potential design alternatives and goals. Traditionally, simulation models were used to evaluate a small number of alternatives in a benefit-cost analysis. Emerging studies of deep uncertainty, conditions where...

The City of Boulder is responsible for supplying reliable, high-quality treated water to 120,000 customers. The reliability and quality of the water supply result from short-term operational decisions, long-term planning efforts and policy development that are informed by a variety of factors including scientific research, data, hands-on experience, economic considerations...

Profound changes in hydrology are occurring in Arctic and sub-Arctic regions. The Yukon River Watershed, covering 330,000 square miles in Alaska and western Canada, is no exception. Since 2006 the U.S. Geological Survey (USGS) and the Yukon River Inter-Tribal Watershed Council (YRITWC) have collaboratively managed the Indigenous Observation Network (ION)...

Urban development leads to changes in stormflow and baseflow, although the magnitude of these changes varies by city. This presentation will examine trends in streamflow with urbanization at the national scale (across the United States) and in Denver, Colorado. Across the U.S., we will examine trends in the flow duration...

Over a billion people globally depend on snowmelt runoff to meet water demands, predominantly from snow that accumulates annually in mid-latitude mountains. Decades of observations show that this natural reservoir is at risk; snow water equivalent and snow extent are declining; even as growing populations rely more on snow water...

Poised at the interface of rivers, ocean, atmosphere and dense human settlement, estuaries are driven by a large array of natural and anthropogenic forces. Long-term study of San Francisco Bay illustrates responses to five common agents of change where land and sea meet: water consumption and diversion, human modification of...