@USBR Prepares for Below Average #Runoff in the #RioGrande #snowpack

Here’s the release from the Bureau of Reclamation (Mary Carlson):

On the heels of a banner water year on the Rio Grande, water managers are again preparing to manage through drought as a below average runoff is expected this spring based on the current snowpack in the mountains of northern New Mexico and southern Colorado.

The Bureau of Reclamation and U.S. Army Corps of Engineers released their Annual Operating Plan for the Rio Grande today showing below average runoff. While the amount of water in the snowpack (snow water equivalent) measured in the mountains feeding the river was close to average in March, the Natural Resource Conservation Service (NRCS) warns that runoff may be below average as a result of low soil moisture levels resulting from a dry fall in 2019.

At the end of March, snow water equivalent was 81 percent of average for the Rio Chama Basin, 93 percent of average for the Upper Rio Grande Basin, 105 percent for the Sangre de Cristos, and 57 percent for the Jemez. Based on these values, the NRCS April streamflow forecast predicts that Rio Chama flow into El Vado Reservoir will be 56 percent of average with an inflow of about 125,000 acre-feet of water. Water is stored in El Vado for the Middle Rio Grande Conservancy District and to meet the needs of the Six Middle Rio Grande Pueblos.

Rio Grande Project storage is currently about 600,000 acre-feet and peaked at about 650,000 acre-feet at the beginning of March before declining as irrigation releases started. The forecast shows that combined usable project storage in Elephant Butte and Caballo Reservoirs is likely to fall below 400,000 acre-feet in late June. This triggers restrictions under the Rio Grande Compact that limit storage in upstream reservoirs such as El Vado.

The Annual Operating Plan public meetings were held by WebEx this year in accordance with federal and state health guidelines. Those who were not able to attend the meetings can still view the presentation on Reclamation’s website at https://www.usbr.gov/uc/albuq/water/aop/index.html or contact Mary Carlson at mcarlson@usbr.gov.

Westwide SNOTEL April 17, 2020 via the NRCS.

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