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. During the spring of 2014, 130 million m 3 of water werereleased from the United States' Morelos Dam on the lower Colorado River toMexico, allowing water to reach the Gulf of California for the first time in13 years. Our study assessed the effects of water transfer or ecologicalenvironmental flows from one nation to another, using remote sensing.Spatial applications for water resource evaluation are important forbinational, integrated water resources management and planning for theColorado River, which includes seven basin states in the US plus twostates in Mexico. Our study examined the effects of the historic binationalexperiment (the Minute 319 agreement) on vegetative response along theriparian corridor. We used 250 m Moderate Resolution ImagingSpectroradiometer (MODIS), Enhanced Vegetation Index (EVI) and 30 m Landsat 8 satellite imagery to trackevapotranspiration (ET) and the normalized difference vegetation index(NDVI). Our analysis showed an overall increase in NDVI andevapotranspiration (ET) in the year following the 2014 pulse, which reverseda decline in those metrics since the last major flood in 2000. NDVI and ETlevels decreased in 2015, but were still significantly higher ( P  < 0.001) than pre-pulse (2013) levels. Preliminary findings show that thedecline in 2015 persisted into 2016 and 2017. We continue to analyse resultsfor 2018 in comparison to short-term (2013–2018) and long-term (2000–2018)trends. Our results support the conclusion that these environmental flowsfrom the US to Mexico via the Minute 319 “pulse” had a positive, butshort-lived (1 year), impact on vegetation growth in the delta.

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Remote sensing vegetation index methods to evaluate changes in greenness and evapotranspiration in riparian vegetation in response to the Minute 319 environmental pulse flow to Mexico