university of guam 1 university of guam weri water and environmental research institute of the...
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1W ERI
University of Guam
WERIWERI
Water and Environmental Research Institute of the Western Pacific
GUAM’S WATER ISSUES
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2W ERI
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3W ERI
COMMONWEALTHOF THE
NORTHERN MARIANAISLANDS
REPUBLIC OF PALAU
YAP STATE
CHUUKSTATE
POHNPEI STATE
KOSRAESTATE
FEDERATED STATES OF MICRONESIA
GUAM
140 150 1600
10
20WESTERN PACIFIC
ISLANDS
+ +400 MILES
7
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4W ERI
Geologic Map of Guam
(Modified and Simplified from Tracey et. al 1964)
Artificial fillAlluviam depositBeach depositMerizo LimestoneMarianas LimestoneAlifan LimestoneJanum FormationBarrigada LimestoneBonya LimestoneBolanos Volcanics (incl. Dan Dan Flow)Facpi VolcanicsMaemong LimestoneAlutom Formation (incl. Mahlac Shale)
N
EW
S
5 0 5 Kilometers
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5W ERI
WATER RESOURCES REGIONS
NORTHERN GUAMLIMESTONE AQUIFER
SOUTHERN GUAM VOLCANICS SURFACE WATER
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6W ERI
MONTHLY AVERAGE RAINFALLR
AIN
FALL
IN
INC
HES
0
2
4
6
8
10
12
14
16
JAN
FEB
MAR AP
RM
AY JUN
JUL
AUG
SEP
OCTNO
VDEC
NAS GAGE
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7W ERI
GUAM ANNUAL RAIN
NOTE: POST-EL NINO YEARS IN RED
0
20
40
60
80
100
120
140
160
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
NOTE: RED INDICATES POST EL NINO YEARS
NORMAL
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8W ERI
TOTAL DAILY RAINFALL 19 INCHES
Typhoon ChataanJuly 4, 2002
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9W ERI
Winds 150 mphWith Gusts 184
TOTAL DAILY RAIN 16 INCH
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10W ERI
• Groundwater
• Water Quality
• Water Distribution System
• Flooding
Critical Issues
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11W ERI
Groundwater LensGroundwater Lens
• Sustainable Yield
• Production
• Saltwater Intrusion
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12W ERI
Sustainable YieldThe rate that water that can be pumped from the lens without:
(1) decreasing water quality
(2) threatening quantity for future use
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13W ERI
production map
#
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Finegayan6.4 mgd6.1 mgd95%
Yigo-Tumon19 mgd16 mgd
84 %Agana12 mgd11 mgd
92 %
Agafa Gumas10.1 mgd1.1 mgd10 %
1998 Aquifer Production and Estimated 1982 Sustainable Yield
Mangilao4 mgd2 mgd50%
Andersen6.2 mgd0.8 mgd13 %
Sustainable Yield 57 mgd
1998 Production 37 mgd (65 % SY)
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14W ERI
32.5
33
33.5
34
34.5
35
35.5
36
36.5
37
37.5
1995 1996 1997 1998
YEAR
MG
D
GWA Aquifer Production
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15W ERI
Saltwater Intrusionin the NGLA
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16W ERI
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# production w ell
sub-basin boundary
# GW A production w ell w /chloride concentration = or > 250 m g/l
N
Agafa GumasSub-basin
AndersenSub-basin
MangilaoSub-basin
FinegayanSub-basin
Yigo-TumonSub-basin
AganaSub-basin
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17W ERI
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18W ERI
local upconing
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19W ERI
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20W ERI
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21W ERI
regional saltwater intrusion
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22W ERI
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23W ERI
SEWER LIFT STATIONSFAILURES
20
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24W ERI
Harmon Sink
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25W ERI
TUMON BAY TOURISM CENTER FOR OUR ISLAND
Sewer Lift Station Overflows
21
Contamination
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26W ERI
RECENT CRISISSouthern Link Pump Station
May 21, 2000: A pump shut down and Raw Sewage overflow into pump station
May 23, 2000: Replacement pump breaks due to wrong electrical control panel
Jan 2001: 62.4MG Raw Sewage has gushed out into Harmon Sink
Jan 2001: 12 MG More into Harmon Sink
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27W ERI
RECENT CRISISSouthern Link Pump Station
(cont.)March 9, 2001: Tumon Bay was closed
because of Bacterial contaminationMarch 12, 2001: Broken pipe dumps
6 MGD of Raw Sewage into Harmon Sink
March 14, 2001: Governor declare state of emergency
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28W ERI
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29W ERI
Green Algae Problem in Tumon BayGreen Algae Problem in Tumon Bay
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30W ERI
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31W ERI
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32W ERI
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33W ERI
SEWAGE LIFT STATIONS
19
Chaot and other failing lift stations are prime suspects for contamination of well water supplies.
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34W ERI
RECENT CRISISChaot Pump Station
March 9, 10, 12, 2001: Wells A-6, A-29, A-30 in Ordot, Hagatna, and Sinajana shows the presence of total coliform & E.coli bacteria.
Cause: Raw Sewage overflow from Chaot pump station for the last 5 years
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35W ERI
ACTION ! March 14: Gov. declared an
emergency and issued an executive order asking Legislature to allow GWA to enter into public-private partnerships???
! GWA injected a large amount of chlorine to the wells in affected area ???
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36W ERI
ACTION (cont.)
! Hotel and Restaurant Assoc. agreed to provide money to fix the Fujita, Liguan and Southern Link pump stations, in exchange for GWA rate reduction
! GWA is in the process of finding a private contractor to maintain 22 pump stations
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37W ERI
WATER DISTRIBUTION SYSTEM CONCERNS
17
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38W ERI
HOT COMMUNICATIONBert Johnston:! We are dealing with a $300M piece of
equipment! Recent problems are due to:
Aged pipes & facilitiesLack of proper maintenanceInability of the system to handle various wastes
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39W ERI
HOT COMMUNICATION(cont.)
Senator Joanne Brown:! Water utility needs qualified
individuals managing the agency! Proper maintenance plans are
essential, and GWA needs to prioritize projects
! Money is not a problem, but management is
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40W ERI
THAT’S WHY WE NEED THESE
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41W ERI
Typhoon Chataan over Guam
FLOOD CONTROL ISSUES
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42W ERI
FLOOD PLAIN MANAGEMENT ISSUES
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43W ERI
FLOOD PLAIN MANAGEMENT ISSUES
! Guam is not enforcing appropriate Flood Plain Management Regulations as required by FEMA
! Flooding maps are outdated– Rainfall frequency statistics need updating– Flood plains need re-delineation
! Need to examine recent flooding for calibration of models
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44W ERI
Summary Comments Summary Comments And And QuestionsQuestions
WERIWERI
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45W ERI
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46W ERI
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47W ERI
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48W ERI
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49W ERI
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50W ERI
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51W ERI
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52W ERI
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53W ERI
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54W ERI
THANK YOU