[Canyon] FW: [bozone-orgs] Gallatin County Drought Resilience Index - April

Thu Apr 5 22:52:17 CDT 2018

From: bozone-orgs at npogroups.org [mailto:bozone-orgs at npogroups.org] On Behalf
Of Zachary Brown (via bozone-orgs list)

Gallatin County Drought Resilience Index 

  _____  

APRIL

Greetings,

You are receiving the next installment of the Gallatin County Drought
Resilience Index. Please refer to this report to learn about current drought
conditions and drought outlook for the Gallatin Valley. This report serves
as a resource to aid in our resilience to changing weather and climate
conditions. Happy April!

- Mitch Lassa 
Big Sky Watershed Corps Member
MSU Extension - Gallatin County, One Montana

April 5th, 2018

Contents:
Snowpack
Streamflow and Reservoir
US Drought Monitor
Montana Counties Drought Map

Snowpack
Gallatin River Basin 

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=9406007494&e=8931cbe945> 

Snowpack Summary: As of April 3, 2018 the Snow Water Equivalent (SWE) for
the Gallatin River Basin is approximately 24 inches, which is approximately
5 inches above average for this time of year. Data is gathered from seven
SNOTEL sites in Gallatin County. After April 3rd, data become projections of
potential snowpack levels. Click
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=31d2fe3c29&e=8931cbe945> here to access the 2017 Water Year NEP
graph to compare current and previous snowpack conditions. For current NEP
graphs of other Montana river basins, click
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=b55fa8fe69&e=8931cbe945> here. For more information on how to read
NEP graphs, click
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=fe3c964441&e=8931cbe945> here. (Source:
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=3b2b22fde2&e=8931cbe945> NRCS) 

<https://gallery.mailchimp.com/7a2f05c545dcc42397dcfbb18/images/41b72e56-3d4
2-4422-9e2d-9387b36db0ce.jpg> 

Map illustrating select SNOTEL sites for Gallatin County (Source:
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=b817f1f958&e=8931cbe945> NRCS SNOTEL Interactive Map) 

Understanding Snowpack Data

Snow Depth - The amount of snow, typically reported in inches, received in a
location

Snow Water Equivalent (SWE) - The amount of water contained within the
snowpack. SWE is a product of snow depth and snow density. It can be thought
of as the theoretical depth of water that would result if all of the
snowpack at a given site melted instantly (Source:
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=004612cc93&e=8931cbe945> NASA)

SWE Percent of Average - The current SWE value compared to the average, or
normal, SWE value for that site (Source:
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=97515d9bc9&e=8931cbe945> NRCS)

Average SWE - The average SWE value, calculated from the period of 1981 to
2010

What is SNOTEL?
SNOTEL (SNOwpack TELemetry) is a method of collecting snowpack data,
including snow depth, snow density, and snow water equivalent values. SNOTEL
data is hosted and collected by the Natural Resource Conservation Service
(NRCS) to develop products like water supply forecasts and support agencies
in other resource management activities. SNOTEL sites are typically located
in mountainous areas and are made up of various sensors that measure snow
and weather conditions. The NRCS also hosts an interactive map that allows
users to select specific SNOTEL sites and view that site's data. For more
information about SNOTEL, visit the
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=28b228d41e&e=8931cbe945> NRCS Snow Survey and Water Supply webpage. 

Streamflow 

Gallatin River Watershed

<https://gallery.mailchimp.com/7a2f05c545dcc42397dcfbb18/images/a874bcc1-992
7-4e14-960c-58289742a507.png> 

Map illustrating select USGS streamgage sites and Middle Creek Dam site for
Gallatin County (Source:
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=d811a9b417&e=8931cbe945> USGS,
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=8df8e4134f&e=8931cbe945> MT DNRC)

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=f34f2e31ad&e=8931cbe945> 

Graph of discharge (cfs) at Gallatin River at Logan MT from March 1, 2018 to
April 5, 2018. 

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=2e0206881b&e=8931cbe945> 

Graph of discharge (cfs) at E Gallatin R ab Water Reclamation Fa nr Bozeman
MT from March 1, 2018 to April 5, 2018. 

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=239958a0d6&e=8931cbe945> 

Graph of discharge (cfs) at Gallatin River near Gallatin Gateway, MT from
March 1, 2018 to April 5, 2018.

Streamflow Summary: As of April 5th, 2018, stream discharge at station
06052500 is 986 cfs - 114% of daily median discharge (862 cfs). At station
06043500, discharge is 153 cfs - 77% of daily median discharge (200 cfs). At
station 06043500, discharge is 346 cfs - 99% of daily median discharge (350
cfs). The median is calculated from a data collection period of 101, 4, and
87 years, respectively. Significant gaps in the availability of historical
instantaneous data may exist due to instrument problems, environmental
conditions or other factors that affect the ability to collect data. 

Understanding Streamgage Data

Discharge - the volume of water flowing past a given point in a stream in a
given period of time measured in cubic feet per second (cfs) (
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=ae806a58e2&e=8931cbe945> USGS)
Gage Height - the height of the water in the stream above a reference point
(
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=8d77eb8d67&e=8931cbe945> USGS)
Temperature - the temperature of a stream, in degrees Fahrenheit, recorded
at a reference point
What is a streamgage?
A USGS streamgage is an active, continuously functioning measuring device
located in the field that computes or estimates a mean daily streamflow or
other set of unit values. USGS streamgages measure the elevation of water in
a river or stream (the stage) which is then converted to a streamflow
(discharge) using a curve that relates the elevation to a set of actual
discharge measurements. The stage is typically measured every 15 minutes and
data is transmitted to the USGS every 1 to 4 hours, after which stage and
streamflow data is calculated and put on to the USGS website. For more
information,
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=6186001517&e=8931cbe945> visit the USGS webpage on streamgages. 

Reservoir 

06050000 - Middle Creek Dam (Hyalite)

Reservoir Elevation Graph 

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=dbc77577fe&e=8931cbe945> Reservoir Elevation Graph and supporting
data for Middle Creek Dam (Hyalite) Reservoir. (Source:
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=27e5897380&e=8931cbe945> DNRC).

Reservoir Summary: As of April 5th, 2018, Middle Creek Dam (Hyalite)
Reservoir elevation is 6,697.5 ft. Reservoir volume is 5,534 acre-ft.
Reservoir percent capacity is 54%. Percent average data has not been updated
at this time. 

Understanding Reservoir Data

Middle Creek Dam (Hyalite)            
Middle Creek Dam (Hyalite), completed in 1951, is owned by the Montana DNRC
and managed by the State Water Projects Bureau through a U.S. Forest Service
Special Use Permit.
The reservoir stores 10,184 acre-feet of water and provides irrigation water
for 73 farms and ranches and drinking water for 2,000 households. The
reservoir is also used for recreational purposes. For more information,
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=0280c8f16c&e=8931cbe945> visit the Montana DNRC  State Water
Projects Bureau webpage. 

US Drought Monitor 

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=4e730c640f&e=8931cbe945> 

Montana Counties Drought Map 

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=1d93071195&e=8931cbe945> 

Drought Monitor Summary: As of March 1st, 2018, the Montana Counties map
indicates that 3 counties in northeastern Montana are experiencing D2
drought, with surrounding counties experiencing D1 and D0 drought. A
majority of Montana counties are experiencing slightly moist conditions. The
U.S. Drought Monitor map - released more recently on April 5th, 2018 -
indicates that drought conditions are similar. A majority of the state
remains at near average moisture conditions. 

Understanding Drought Data

How is drought measured? 
Drought is quantified through a number of factors including precipitation,
wind, streamflow, and soil moisture measurements. Drought is categorized
into drought intensity designations based on percentiles, e.g. D2, D3, D4.
For example, D4 drought occurs when precipitation, streamflow, and soil
moisture measurements are at percentiles of 0-2, meaning that these are
extremely low measurements and should only occur 0-2 times in 100 years.
Please visit the
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=978674bdb3&e=8931cbe945> US Drought Monitor website for more
information on drought classification.

What is the Montana Drought Impact Reporter?
The Montana Drought Impact Reporter (MDIR) is an interactive web-based
mapping tool designed to compile and display impact information in near
real-time from a variety of sources such as media, government agencies, and
the public. The MDIR is vital in order to ground-truth national trends at a
local level. Please visit the
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=38047e7e97&e=8931cbe945> Montana DNRC webpage on Drought Management
to access the MDIR and report current conditions in your area. 

If you are interested in receiving any more information on snowpack, stream
flow, and drought resiliency contact Mitch Lassa, Big Sky Watershed Corps
Member, at MSU Extension in
Gallatin County and One Montana: 
 <mailto:mitchl at onemontana.org> mitchl at onemontana.org, 406-522-7654 ext. 6,
or 406-582-3280 ext. 3286.
The Gallatin County Drought Resiliency Index can be found online at

<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=ea702f6b1a&e=8931cbe945>
http://www.msuextension.org/gallatin/NaturalResourcesDroughtIndex.html.
All map and graph data can also be accessed by clicking on the image.
We welcome your feedback-Please click
<https://onemontana.us16.list-manage.com/track/click?u=7a2f05c545dcc42397dcf
bb18&id=d9a2e28fac&e=8931cbe945> here to complete a survey to improve this
report.

<https://gallery.mailchimp.com/7a2f05c545dcc42397dcfbb18/images/fee19b1d-985
4-4cf7-ad80-44158b633afb.jpg> 

<https://gallery.mailchimp.com/7a2f05c545dcc42397dcfbb18/images/93080354-e0e
d-4a82-ac3e-4516b08756c3.png> 

The U.S. Department of Agriculture (USDA), Montana State University and
Montana State University Extension prohibit discrimination in all of their
programs and activities on the basis of race, color, national origin,
gender, religion, age, disability, political beliefs, sexual orientation,
and marital and family status. Issued in furtherance of cooperative
extension work in agriculture and home economics, acts of May 8 and June 30,
1914, in cooperation with the U.S. Department of Agriculture, Jeff Bader
Director, Extension Service, Montana State University, Bozeman, MT 59717

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One Montana

 <mailto:zachb at onemontana.org> zachb at onemontana.org

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