Drought in Managed Systems - Snake River Plain
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Drought in Managed Systems—Snake River PlainPresented by David Hoekema
Water Supply Committee Meeting
Date: April 14th, 2015
Idaho Water Supply CommitteeIdaho Department of Water Resources (IDWR) hosts meetings
• Meets every 2nd week of the month (Jan-April)
• April 1st marks the beginning of the Irrigation Season and Peak
Snowpack.
• Membership
- IDWR, Homeland Security, Idaho Department of
Agriculture, Idaho F&G, USBR, NWS, NRCS, USACE,
USGS, USFS, Farm Service Agency, IPCo
• Responsibilities
- Track drought, coordinate with agencies, provide public
information
Defining Drought in the West• Climate (Rain, Temp, and SWE)
• Warm and Dry Winter
• Unusual August rains (PDSI, SPI, etc.)
• Storage Supplies vs. Irrigated Regions
• USBR Hydromet
• Supply vs. Demand
• Groundwater (responds to climate and management)
• Managed conjunctively
• Managed thru mitigation (rental pools)
0
5
10
15
20
25
30
1-Oct 1-Nov 1-Dec 1-Jan 1-Feb1-Mar 1-Apr 1-May 1-Jun
Sn
ow
Wa
ter
Eq
uiv
ale
nt
[SW
E, in
]
North Fork Composite[Long Valley, Bear Basin, Squaw Flat,
Burndage Reservoir, Secesh Summit, Big Creek]
Median 1981-2010 2013 2014 2015
0
5
10
15
20
25
30
Sn
ow
Wa
ter
Eq
uiv
ale
nt
[SW
E,
in]
Long Valley-SnotelElevation 4890 ft
Median 1981-2010 2013 2014 2015
60%
42%
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
14,000,000
16,000,000
18,000,000
20,000,000
Cu
mu
lati
ve S
tora
ge C
han
ge (
acre
-fe
et)
Cumulative Volume Change of Water Stored Within ESPA
Water Budget Volume Change ESPAM1.1 Simultaneous Volume Change
Declines in the eastern Snake Plain aquifer
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