About Gwyn

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So far Gwyn has created 116 blog entries.
May 18, 2018

U.S. Drought Monitor

2018-05-18T08:57:24+00:00 May 18, 2018|

Exceptional drought baking 500+ mile area along 37th parallel from AZ/UT to KS/OK. Precipitation totals nearing record lows for northern 1/3 of NM. Range & pasture rating in AZ is the worst since 1995.

May 11, 2018

State law recognizes rivers and groundwater are connected — now what?

2018-05-09T14:47:45+00:00 May 11, 2018|

A new state law gives California the opportunity to restore groundwater in a manner that will boost the state’s sustainable water supply.   For years, Californians have mismanaged the aquifers that supply the state with about 40 percent of its water supplies. Declining water levels from over-pumping have left less water for agriculture, urban, and other [...]

May 09, 2018

Colorado water managers studying Lake Powell levels issues

2018-05-03T10:40:49+00:00 May 09, 2018|

GRAND JUNCTION — About 120 water managers gathered Wednesday to discuss how to keep enough water in Lake Powell and avoid a demand from downstream states for more water under the Colorado River Compact, and they agreed to keep studying potential solutions. Jim Pokrandt of the Colorado River District opens a meeting Wednesday in [...]

May 07, 2018

To Manage California’s Groundwater, Think More About Surface Water

2018-05-03T08:37:16+00:00 May 07, 2018|

California’s groundwater agencies need to create sustainability plans, says Michael Kiparsky of the University of California Berkeley School of Law, noting that, unless those plans also take surface water into account, they might not work. CALIFORNIA’S 2014 LEGISLATION, the Sustainable Groundwater Management Act (SGMA) was significant in that it was the state’s first major groundwater regulation. But Michael Kiparsky the founding [...]

May 04, 2018

Modeling, Measuring, and Comparing Crop Evapotranspiration in the Delta

2018-05-01T10:15:24+00:00 May 04, 2018|

Crop evapotranspiration (ET) is the biggest managed loss of water in California, accounting for roughly 80% of human net water use, and includes crop water applications transpired from plants and evaporated from soil. Methods to estimate ET have been developed based on a robust scientific understanding of its physics and data collected in the field [...]

May 01, 2018

Big Challenges for Colorado River States That Want to Conserve Water

2018-05-01T09:06:36+00:00 May 01, 2018|

Lower Basin states can easily store conserved water upstream in Lake Mead, but it’s not so simple for Upper Basin states with major reservoirs below them. There are some solutions in the works, but they’re not easy or cheap. Lake Powell, a reservoir on the Colorado River straddling the border between Utah and Arizona, is [...]

Apr 25, 2018

Do You Know Your Water, Colorado?

2018-04-24T13:57:31+00:00 Apr 25, 2018|

A Cheat Sheet for Understanding Where Your Water Comes From and How You Can Protect this State’s Most Valuable — and Threatened Resource Colorado River Basics Rivers are the lifelines of Colorado’s economy, environment, and lifestyle. They touch everyone in our state, providing most of our clean, safe, and reliable drinking water; supporting our thriving farms and ranches; [...]

Apr 23, 2018

Replenishing Groundwater in the San Joaquin Valley

2018-04-18T12:25:23+00:00 Apr 23, 2018|

Summary The San Joaquin Valley—which has the biggest imbalance between groundwater pumping and replenishment in the state—is ground zero for implementing the 2014 Sustainable Groundwater Management Act (SGMA). Expanding groundwater recharge could help local water users bring their basins into balance and make a dent in the long-term deficit of nearly 2 million acre-feet per [...]

Apr 20, 2018

Groundwater Recovery in California – Still behind the curve

2018-04-18T12:30:40+00:00 Apr 20, 2018|

California has a unique and highly variable climate in which drought reoccurs periodically. California began this century in a dry period from 1999 to 2005, and experienced droughts from 2007 to 2009, and 2012 to 2016.  Such wet-dry cycles can be seen in Figure 1, which shows total rainfall amounts per water year (water years [...]

Apr 13, 2018

Understanding What the ‘New Normal’ Means for Water in the West

2018-04-12T08:46:50+00:00 Apr 13, 2018|

APRIL IS OFTEN a time of abundance in the mountains of the American West, when snowpack is at or near its peak, and forecasters work to determine how much runoff will course through our rivers and fill reservoirs later in the season. This year, across much of the West, particularly the Southwest, there’s little in the [...]