All across the state of Idaho, 27 researchers with the U.S. Geological Survey are studying 150 different stream sites to gather baseline data helpful for assessing just how vulnerable streams in the state are to drought conditions. <\/p>\n
Their preferred time of year for attacking the issue is late summer, right before the rainy season starts. That\u2019s because the streams will be at their lowest during that period, giving an easily identifiable baseline on which scientists can build throughout future studies. <\/p>\n
\u201cThe reason why we had so many people is so we can get it done as quickly as possible. It\u2019s a snapshot in time,\u201d said Dave Evetts, data chief at the Idaho Water Science Center. \u201cIt\u2019s really important that we get these measurements at the lowest point in the year \u2014 late summer and early fall. It\u2019s a short window to work with.\u201d<\/p>\n
Add a couple of ongoing wildfires to that time crunch and things can get a bit hairy. Evetts says that the study is mostly complete, in alignment with its mid-September target for being done, but that a few sites still need to be assessed. These are located in areas affected by fires near Clearwater, Idaho.<\/p>\n
Once USGS scientists can access them, they will use methods that they\u2019ve employed to study other streams in the investigation. <\/p>\n
\u201cMost of the sites are pretty small. They\u2019re streams you could straddle,\u201d said Evetts. Typically, FlowTrackers are used to measure velocity by a researcher outfitted in waders. Those measurements are complemented by measures of a stream\u2019s width and depth that can be used to calculate discharge. \u201cWe also measure temperature, which impacts fish, and conductance. It tells us if the source of the water is groundwater or snowmelt.\u201d<\/p>\n
![\"A](\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2015\/09\/drought_stream2.jpg\")
A hydrologic technician from the USGS Idaho Water Science Center measures streamflow in Fall Creek near Anderson Ranch Dam in southwestern Idaho. (Credit: John Wirt \/ U.S. Geological Survey)<\/p><\/div>\n
Evetts says that Idaho has been lacking quality snowfall in recent years. Snowpack is much more valuable in terms of ensuring water availability throughout the year because it melts slowly and adds to streams incrementally. Rainfall, by contrast, comes rolling through and pushes streams higher for only a short period of time before moving on to waterways downstream.<\/p>\n
The state has had a fairly normal amount of precipitation recently but most of that has come in the form of rain. <\/p>\n
\u201cIt\u2019s a unique opportunity to see how that affects stream systems in Idaho,\u201d said Evetts. \u201cSome potential causes for that \u2014 the obvious one is climate change. We also have a very strong El Ni\u00f1o that is forming in the Pacific.\u201d<\/p>\n
He continues, \u201cBasically, off of personal experience, we seem to be trending to get more rain instead of snow. Idaho\u2019s been lucky to store water in reservoirs and it\u2019s been able to call on that. If that continues, we could see more severe impacts in years to come.\u201d<\/p>\n
As for the results of the work, Evetts says that he doesn\u2019t have any expectations for what the data will reveal. Still, the findings will likely be useful to water managers across the state. By pinpointing which streams are most vulnerable to drought conditions, the officials can change conservation approaches or adjust how water resources are allocated. In addition, fish and game organizations can use the information to see how drought conditions could affect fish and wildlife.<\/p>\n
In the future, further study on these streams would be incredibly valuable for helping the management of water resources, but that is up in the air right now.<\/p>\n
\u201cWe\u2019d like to see if we can get cooperation with state and federal agencies. This study in Idaho is completely funded by the USGS,\u201d said Evetts. \u201cAdditional data collection for years to come would help establish trends that could help us deal with sustained drought conditions, to gauge if it will be here a while, increase or be more severe.\u201d<\/p>\n
The work in Idaho is part of a larger effort supported by the USGS that is underway in a total of six western states to assess vulnerability to drought. Nearly 500 other scientists are aiding efforts also taking place in California, Nevada, Oregon, Utah and Washington.<\/p>\n
Top image:\u00a0A hydrologic technician from the USGS Idaho Water Science Center measures streamflow in the St. Joe River at Red Ives Ranger Station in northern Idaho. (Credit: Dan Hess \/ U.S. Geological Survey)<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"Scientists with the U.S. Geological Survey are gathering data on streams in Idaho and five other western states to assess drought vulnerability.<\/p>\n","protected":false},"author":13,"featured_media":23280,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,49],"tags":[155,60,109,348,98,73],"class_list":["post-23285","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured-articles","category-rivers-streams","tag-drought","tag-featured","tag-news-ticker","tag-rivers-streams","tag-streamflow","tag-usgs"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\n
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