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Minute 319, a binational agreement between the United States and México, authorized environmental flows into the Colorado River Delta, including a high-profile pulse flow delivered in March through May 2014. Reforming water management policy to secure future delivery of environmental flows to the delta hinges on demonstrating the feasibility of delivering environmental water and documenting positive ecological responses of the delta's severely degraded riparian habitat. The design of the flow's hydrograph, the novel utilization of irrigation infrastructure, the preparation and subsequent maintenance of selected restoration sites, and interdisciplinary monitoring at multiple scales combined to show that ecological...
The Science and Policy of the First Environmental Flows to the Colorado River Delta The first transboundary flow of water for the environment was delivered to the Colorado River Delta in spring of 2014. This engineered mini-spring flood of 130 million cubic meters (105,000 acre-feet) was implemented as part of Minute 319, an addition to the 1944 U.S.-Mexico Water Treaty. Minute 319 is a temporary agreement, expiring in 2017. Teams of scientists from government agencies, universities, and environmental NGOs from both the U.S. and Mexico are measuring the surface flow rates, inundation, ground water recharge, ground water levels and subsurface flows, geomorphic change, recruitment, survival and health of vegetation,...
Just Add Water: Historic Return Of The Colorado River To Its Delta, United States And Mexico On May 15, 2014, the Colorado River reached the sea for the first time in decades. This was but one highlight of an unprecedented experiment in binational water management – the world’s first transboundary water allocation for the environment. Minute 319, signed by Mexico and the United States in 2012, changes the way the two countries share water in the over-allocated Colorado River basin. One of its provisions is a “pulse flow” of 105,000 acre-feet of water released from Morelos Dam into the parched Colorado River delta. Implemented in March-May 2014, the pulse flow was intended to emulate the ecological functions of...
The objective is to create a hydrologic foundation for detailed assessment of human and climate impacts on stream and river flows, including the impacts of hydrologic alterations on aquatic habitats. A specific application will be to support implementation of ELOHA, the Ecological Limits of Hydrologic Alteration, a scientific framework for determining environmental flow needs for all rivers and streams throughout a very large region. During Year 1, we will model pre-development (unaltered) daily flows for 1960-2006 for every enhanced national hydrography dataset (NHDPLUSPlus) catchment within the SALCC. We will also model current condition daily flows over the same time period for at least 6 watersheds using available...
Increasing pressure on water availability in the Colorado River Basin due to a long and severe drought, water over-allocation, increasing water demands, and a warming climate point toward the need to opti- mize use of water to meet all goals, including environmental restoration. In this paper, we analyze the hydrologic response of the Colorado River Delta to the 2014 pulse flow. In so doing, we identify hydrological criteria for optimizing the use of water for riparian restoration. We analyzed continuous hydrographs obtained from discharge measurement sites along the river channel, quantified areas inundated by water, and interpreted groundwater dynamics and their implications for riparian vegetation. Our most important...
In 2014, the United States and Mexico jointly delivered an environmental flow to the Colorado River Delta, as authorized in a 2012 binational water management agreement known as Minute 319. The agreement specified a volume of water, the source of the water, that the water should be delivered as a pulse flow, and that the objectives of the pulse flow were to pilot environmental restoration and learn about the hydrologic and ecological responses to water delivery into the Colorado River Delta. The Minute did not specify the characteristics of the pulse flow, but rather specified a process, calling on a group of stakeholders, including federal, state, and local water managers as well as non-governmental conservation...
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In February 2014, taking action to implement a 2012 U.S.-Mexico agreement on the Colorado River known as Minute 319, International Boundary and Water Commissioners (IBWC) Edward Drusina and Roberto Fernando Salmon Castelo announced plans to move forward with a one-time pulse flow (a release of water into the Colorado River channel below the last dam on the River) as well as a five-year commitment by a coalition of Non-Governmental Organizations to deliver base flow water. Minute 319’s environmental water deliveries to the Colorado River Delta are intended to restore native riparian habitat along the river corridor, where invasive non-native saltcedar has displaced the native willow and cottonwood trees that provide...
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In February 2014, taking action to implement a 2012 U.S.-Mexico agreement on the Colorado River known as Minute 319, International Boundary and Water Commissioners (IBWC) Edward Drusina and Roberto Fernando Salmon Castelo announced plans to move forward with a one-time pulse flow (a release of water into the Colorado River channel below the last dam on the River) as well as a five-year commitment by a coalition of Non-Governmental Organizations to deliver base flow water. Minute 319’s environmental water deliveries to the Colorado River Delta are intended to restore native riparian habitat along the river corridor, where invasive non-native saltcedar has displaced the native willow and cottonwood trees that provide...
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The objective is to create a hydrologic foundation for detailed assessment of human and climate impacts on stream and river flows, including the impacts of hydrologic alterations on aquatic habitats. A specific application will be to support implementation of ELOHA, the Ecological Limits of Hydrologic Alteration, a scientific framework for determining environmental flow needs for all rivers and streams throughout a very large region. During Year 1, we will model pre-development (unaltered) daily flows for 1960-2006 for every enhanced national hydrography dataset (NHDPLUSPlus) catchment within the SALCC. We will also model current condition daily flows over the same time period for at least 6 watersheds using available...
    map background search result map search result map Water Delivery Data and Model Integration for Restoring Ecological Health to the Colorado River Delta Unified hydrologic model for assessing human and climate impacts on streamflows at multiple geographic scales Results and Reports: Water Delivery Data and Model Integration for Restoring Ecological Health to the Colorado River Delta Water Delivery Data and Model Integration for Restoring Ecological Health to the Colorado River Delta Results and Reports: Water Delivery Data and Model Integration for Restoring Ecological Health to the Colorado River Delta Unified hydrologic model for assessing human and climate impacts on streamflows at multiple geographic scales