How much snow falls in the high country over the winter, and how much water is in the snow, provides Centennial Water with a clue as to what the district can expect come spring and summer. Centennial Water’s water resources staff keeps a close eye on snowpack reports all winter long.
In Colorado, snowpack and the resulting snow water equivalent is tracked during winter months because it can assist planning for spring and summer water supply. Snowpack impacts how much streams flow and how much water may be available to water utilities like Centennial Water.
“Most of our water supply comes from snowpack that melts and makes its way to streams, known as runoff. This runoff flows downstream and is captured in reservoirs. How much we are able to capture is determined by water rights at any given time,” said Swithin Dick, water resources administrator.
Snowpack is the total amount of snow on the ground. Throughout the winter, experts regularly measure the snow water equivalent in the mountain snowpack. Snow water equivalent is the amount of water contained in snow. This translates into the amount of runoff Centennial Water may be able to capture.
Tracking the amount of water in snow is not as easy as looking at how much snow there is. Twelve inches of snow does not equal 12 inches of water. The amount of water released by snowmelt varies based on how dense the snowpack is. According to the National Weather Service, there can be one inch of water produced for every 10 to 12 inches of snow.
The Natural Resources Conservation Service (NRCS) releases a statewide map displaying Colorado snowpack conditions and snow water equivalent. The map is what is frequently shared by meteorologists on local news stations. The percentage reported represents the current snowpack in each basin compared to the historical average for the same day. Above 100 means snowpack is above-normal; below 100 means snowpack is below normal for that date.
Centennial Water’s watershed is located in the South Platte River Basin. View the map above for recent snowpack reports from NRCS. NRCS releases a new map daily. To access the most recent Colorado snowpack conditions, visit the NRCS website.