what we know about regional water supply and …total reported pumpage – all facilities: ~1.7 bgd...
TRANSCRIPT
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WHAT WE KNOW ABOUT REGIONAL WATER SUPPLY
AND DEMAND TODAY.
WHAT ARE THE KEY ISSUES?
Derek Winstanley
MAC/RWSPCHavana
April 27, 2007
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REMINDER
• 3-year pilot project.• Produce best plan you can by the end of 3
years with the resources and data available to you.
• Hopefully transition into a permanent water supply planning process.
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EAST-CENTRAL ILLINOIS
• WATER USE DATA• CLIMATE AND SOIL MOISTURE DATA• STREAMGAGE DATA• OBSERVATION WELLS• POTENTIOMETRIC HEAD DATA• KEY QUESTIONS
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DRAFT WATER USE DATA:15 COUNTIES(Illinois Water Inventory Program at ISWS)
Total Active Facilities = 322Community Water Systems = 215
89% Returned 200487% Returned 2005
Industrial-Commercial = 7080% Returned 200484% Returned 2005
“Other” (golf courses, farms, state parks, conservation) = 5976% Returned 200480% Returned 2005
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DRAFT WATER USE DATA (Illinois Water Inventory Program at ISWS +)
7.50 MGD (2004)9.50 MGD (2005)
6.48 MGD (2004)6.98 MGD (2005)
Other
SW use mainly once-through cooling
1196.96 MGD (2004)1359.91MGD (2005)
28.84 MGD (2004)30.12 MGD (2005)
Industrial-Commerical
61.69 MGD (2004)71.01 MGD (2005)
61.86 MGD (2004)66.32 MGD (2005)
Community Water Systems
NotesSurface WaterGroundwaterReported Pumpage
Total Reported Pumpage – All Facilities: ~1.7 BGD (2005)
17 MGD (2000; USGS)
Self supplied domestic
>137 MGD(2006; Imperial Valley +)
Irrigation
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ISWSCLIMATE AND SOIL MOISTURE SITES
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a) Mean annual precipitation 1971-200b) 1 in 200 year drought
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USGS GAGING STATIONS:MONTHLY FLOW DATA
M Mackinaw River near Congerville
N Salt Creek near Greenview
O Sangamon River at Monticello
P South Fork Sangamon River near Rochester
S Vermilion River near Danville
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SUSCEPTIBLE TO DROUGHT?
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SHALLOW OBSERVATION WELLSWARM wells (monthly) ICN wells (hourly)
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Domestic Wells in Champaign, Piatt,
Dewitt, and Macon Counties
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IMPERIAL VALLEY
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GROUNDWATER: WATER QUALITY
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Mahomet Aquifer PotentiometricSurface
10-foot contourFlow direction
610
580 680
550
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Land Surface
Unconfined Aquifer
Water Table
Bedrock
Unsaturated (Vadose) Zone
Saturated Zone
Confined Aquifer
Confining Layer - AquitardPotentiometric Surface
Unconfined and Confined Aquifers
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Increasing water withdrawalsto meet increasing water demands
1950 1960 1970 1980 1990 2000 2010
4
8
12
16
20
24P
umpa
ge a
t Cha
mpa
ign,
mill
ion
gallo
ns p
er d
ay
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Mahomet Aquifer Heads near Champaign
1950 1960 1970 1980 1990 2000 2010580
600
620
640
660
Grou
ndwa
ter
elev
atio
n, f
eet
Land surface elevation ~ 715’ MSLTop of Mahomet aquifer ~ 550’ elevationDTW on 9/26/06 = 121.7’ or 593’ MSL
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650’ Head
593’ Head
550’
715’LandSurface
Pre-development Today 2025-2040
0mgd ~30mgd ~48mgd
Mahomet Aquifer
Decline in artesian head west of Champaign
550’ Head
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• +2 mgd
CUMULATIVE IMPACTS WITH +10 MGD THRESHOLD
+4 mgd
+6 mgd
TOTAL +12 mgd
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THE WATER CYCLE:CLIMATE, SURFACE WATER, and
GROUNDWATER ARE ALL LINKED
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KEY QUESTIONS
• Water law – what is reasonable use?
• What is the sustainability of water supply?
• What will be the impacts of additional withdrawals?
• What impacts will be socially acceptable?
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KEY QUESTIONS (contd.)• How can you manage water resources to
ensure adequate water supplies during droughts?
• How can you manage water resources that vary regionally (e.g. Mason County vsChampaign County)?
• How can Water Authorities tie into regional water supply management?
• Can you manage water supply regionally with existing institutions and laws?