Saturday, February 9, 2013

What is a natural hydrograph?

The pre-development or "natural" state of a river system provides important context for river ecosystem management and rehabilitation: What did the river system look like before major development?  What is the "natural" hydrologic regime?  How are species adapted to the natural hydrograph?  These are all questions that the UTREP is investigating in the upper Tuolumne, and are common to many other river ecosystem management efforts.

On January 18, 2013, the Delta Science Program and the UC Davis Center for Aquatic Biology & Aquaculture (CABA) hosted a seminar to explore how we use, and what we mean by, a natural hydrograph or unimpaired flows.  The seminar focuses on the California Bay-Delta, but is relevant to work on the upper Tuolumne and elsewhere.

Video of the seminar is available on the CABA website.

Tuesday, February 5, 2013

Lyell Glacier in the news

The San Francisco Chronicle reported on the retreat of the Lyell Glacier in Yosemite National Park, at the headwaters of the Tuolumne River.  Recent work by NPS on the rate of retreat was presented at the Fall 2012 meeting of the Upper Tuolumne River Stakeholder Group.