2010 10-21 meeting long term water demands
DESCRIPTION
Mr. Jun Chang presentation was entitled “Meeting Long-Term Water Demands for Houston and Surrounding Areas.” Mr. Chang is a Deputy Director, Public Works & Engineering Department at the City of Houston.TRANSCRIPT
Meeting Long-Term WaterDemands for Houston and
Surrounding Areas
Jun Chang, P.E., D.WREDeputy Director
Department of Public Works and EngineeringCity of Houston
Oct. 21, 2010
First, a brief history…
Scenic Houston circa 1891
Houston Water Works
• 1878: The Mayor and City Council franchised aprivate contractor to build a water system (HoustonWater Works) taking water from Buffalo Bayou.
• Private artesian wells were the alternative to bayouwater. The Gulf Coast aquifer is Houston’s groundwater source. This aquifer was estimated to be thethird largest in the country, extending from Florida toMexico.
• Over the course of the next several decadesHouston Water Works converted to artesian water.
• 1906: The City purchased the Houston Water Worksto improve water quality and citizen’s service.
Houston Water System
• Early 1940’s Land Subsidence Benchmark re-leveling resultsBaytown Area had subsided 3.2 feetTexas City Area had subsided 1.6 feet
• The Houston Chamber of Commerce in 1947 commissioned asystematic Regional Water Study to support Houston’s futuregrowth
• With the discovery that one of the major causes of landsubsidence was excessive ground water pumping; plusanticipated population growth, Houston’s acquired surfacewater sources and constructed dams with River Authorities:
Surface Water Reservoirs
1954 Lake Houston – dam on the San Jacinto River east fork1969 Lake Livingston dam on Trinity River – southwest of Livingston1973 Lake Conroe – dam on the San Jacinto River2002 Land and water rights acquired for Allen’s Creek Reservoir
Houston Surface Water Supply - Reservoirs
Allen’sAllen’sCreekCreek
LakeLakeHoustonHouston
Houston Water System• Houston has also invested in surface water treatment
plants:- 1953 East Water Purification Plant I- 1985 East Water Purification Plant II- 1989 Southeast Water Purification Plant - Original- 2001 Southeast Water Purification Plant Expansion I- 2005 Northeast Water Purification Plant – Phase I- 2006 Northeast Water Purification Plant – Phase II- 2011? Southeast Water Purification Plant Expansion II
• Regional Subsidence Districts established strict goals forthree Houston counties to convert predominant watersource of ground water to surface water– 1975 Harris-Galveston Subsidence District– 1989 Fort Bend Subsidence District
• Surface Water Conversion– 1985 SWTP started
SWTP $740 million spent from 1985 to present
City of Houston Transmission Water Lines Constructed
Houston Water System
• Surface Water Treatment Facilities & Capacities– East Water Plant - 350 MGD– Southeast Water Purification Plant – 120 (200)
MGD– Northeast Water Purification Plant – 80 MGD
• 7 Distribution Re-pump Stations• Ground Water Facilities
– 134 Water Wells– 58 Pumping Stations– 98 Storage Tanks
• Deliver annual (2009) average of 347 MGDof water (Max. 585 MGD)
• Service 470,000 customer accounts1,162,720 connections2,940,000 residents
• Maintain 7,480 miles of water lines
• 54,000 Fire Hydrants
• 150,000 Valves
Houston Water System
Let’s plan for the future…
Long Range Planning Considerations
Water Rights (Supply)
Conveyance System(Raw Water)
Transmission and Distribution(Treated Water)
Treatment and Pressurizing(Plants and Re-Pump Stations)
Demands (Customers)
What is the driving force?
Region H Water Planning GroupRegion H Water Planning GroupS.B. 1, 75th Legislature, defined state water planningS.B. 1, 75th Legislature, defined state water planningprocessprocessSixteen regions in stateSixteen regions in stateRegion H: Parts or all of fifteen countiesRegion H: Parts or all of fifteen countiesRequire Regional Water Plan by January 2001Require Regional Water Plan by January 2001Regional Water Plans become State Water Plan 2002Regional Water Plans become State Water Plan 2002Regional Water Plan updated regularlyRegional Water Plan updated regularlyCurrent Planning Cycle (2007Current Planning Cycle (2007--2011)2011)All projects requiring state approval or permits must beAll projects requiring state approval or permits must beincluded in State Water Plan after 2002included in State Water Plan after 2002Board consists of 23 members appointed by Texas WaterBoard consists of 23 members appointed by Texas WaterDevelopment Board (TWDB) representing eleven interestsDevelopment Board (TWDB) representing eleven interests
Region H
HarrisHarris--Galveston Subsidence DistrictGalveston Subsidence District
Established in 1975 by 64th LegislatureEstablished in 1975 by 64th LegislatureThe Board has 19 members (Mayor ofThe Board has 19 members (Mayor ofHouston appoints six members)Houston appoints six members)Issues permits to withdraw groundwater inIssues permits to withdraw groundwater inHarris / Galveston CountiesHarris / Galveston CountiesProponent of active water conservationProponent of active water conservationprogramsprogramsLatest Regulatory Plan adopted April 14, 1999Latest Regulatory Plan adopted April 14, 1999Three Regulatory AreasThree Regulatory Areas
6
1
23 6
44
5
6
7
6
4
32
1
4
1 2
35
5
6
7
9
910
8
Map contoured in 1 Foot Intervals HGCSD GWMP
Subsidence in Feet1906 - 1995
Data Source: National Geodetic SurveyContour Interpretations: HGCSD
Area 3 Predicted Subsidence1995 - 2030
5
43
2
5
54
33
3
2 2
1
21
3
45
Data Source: Fugro-McClelland CSD96Contour Interpretations: HGCSD
• Area I 90%• Area II 80%
• Area III– 30% by 2010– 70% by 2020– 80% by 2030
Conversion Requirements Area 3Area 3
Area 2Area 2Area 1Area 1
Harris-Galveston Subsidence DistrictSurface Water Conversion Plan
COH 2009 Surface Water ConversionArea I: 100%Area II: 87%Area III: 45%
City of Houston Surface Water Conversion
Who are our partners?
Strategic Suppliers, Resources & AlliancesTrinity River
Authority (Including Big 5)Lake Livingston
Coastal WaterAuthority
Conveyance canals,pumps & pipes
Brazos RiverAuthority
(Allens Creek)
Texas WaterDevelopment BoardRegion H Planning &
Financing
Galveston BayFresh Water Inflows
GroupHealth of the Bay &Wastewater Reuse
San Jacinto RiverAuthority
Lake Conroe
Who are our customers?
COH Treated & Untreated Water Customers
CommercialIndustrial
HoustonCitizens
LocalCities &Villages
LocalCities
LargeIndustrial
StrategicPartners
WaterAuthorities
SE PlantCo-Parts
HarrisCountyMUDs
COHWater
Resources
Treated Water Customers Untreated Water Customers
Strategic CustomersNorth Harris County
Water Authority
Central Harris CountyWater Authority
North Fort Bend CountyRegional Water Authority
Southeast WPPCo-Participants
West Harris CountyWater Authority
What are the future demands?
Houston Water Master Plan
Average Day Demand for City of Houston
0
200
400
600
800
1000
1200
1400
1985 1990 2000 2010 2020 2030
Year
Ave
rage
Dem
and
(MG
D)
Average Day Demand
1200
9701080
715840
646
Water Demand ForecastCOH 1996 Study
300
350
400
450
500
Year
Wat
er D
eman
d M
GD
1984 1987 1990 1993 1996 1999 2002 2005 2008 2011 2014 2017 2020
Demand using 9 - year regression
Demand using 13 - year regression
Actual Demand
HGCSD/COH-UH
TWDB
Montgomery Watson
Modified TWDB
Water Demand Forecast
ARC Regression Method
250270290310330350370390410430450
1980 1985 1990 1995 2000 2005 2010Year
Flow
(MG
D)
Actual Historical Demand ARC Regression Line
Linear Regression
Average Rate of Change (ARC) Method used for Regression AnalysisAverage Rate of Change (ARC) Method used for Regression AnalysisCity’s Pumpage Reports was used from 1983 through 2005City’s Pumpage Reports was used from 1983 through 2005Growth Factor calculated from this analysis is 1.01Growth Factor calculated from this analysis is 1.01
COH 2006 Updated Study
City of Houston and Water Authorities Water Demand Projections
Do we have enough water?
Houston Water SupplySURFACE WATER RIGHTS
San Jacinto River BasinLake Conroe 60 MGDLake Houston 150 MGD + 12 MGD* + 36MGD*
Trinity River BasinLake Livingston 806 MGDDayton Canal 34 MGDWallisville 34 MGDBarbers Hill Canal 40 MGD
Brazos RiverAllens Creek 62 MGD
Total Permitted Water Rights 1,234 MGD
Permit pending 143 MGD (Bayous)519 MGD (Reuse)
AVAILABLE GROUND WATER 235 MGD Per Subsidence Rules
TOTAL WATER AVAILABLE 2,131 MGD
*Recently Permitted
TOTAL Surface Water Supply & Demand Forecast
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2010 2020 2030 2040 2050
Mill
ion
Gal
lons
per
Day
PENDING #5826 bayous +143 MGD
PENDING #5827 reuse +519 MGD
Permitted Water RightsLk Conroe, Lk Houston,
Lk Livingston, Wallisville,Barber's Hill, Dayton Canal
and Allens Creek.1197 MGD
San Jacinto Run of River +36 MGD
City of HoustonSurface Water
Demand
Pending SurfaceWater Contracts
Surface Water RightsApproximately
1.2 Billion Gallons per Day
Allens Creek Reservoir• Location
– 3000 feet upstream of Allens Creek– near Wallis (southern tip of Austin County)
• History– planned and permitted cooling lake– Houston Lighting & Power in 1974
• Operation– capture yield of Allens Creek– diversions from the Brazos River of flood flows
• Cost Estimates– depends on diversion site selected– current estimate $200 million without mitigation
Pertinent Information• Yield studies
– diverts Brazos River flood flows– 99,650 Acre-feet per year (89MGD) with
2,200 cfs diversion– safe yield: 87,800 AF/Yr
• Surface Area/Volume– 7,003 acres; 145,533 AF
• Pool Elevation (normal) - 121 ft msl• Dam: earth-filled embankment, 23,000 feet;
max height - 53 feet; elevation 134 ft msl
Allens Creek Reservoir• Authorized by 76(R) SB1593 (Sept 1999)
Construction shall commerce no later thanSeptember 1, 2018TCEQ may extend the deadline for good cause
• BRA executes option with Reliant Energy(November 1999)
• Site conveyed to BRA by Warranty Deed (January2000)
• TCEQ reissued original permit (Feb 2000)• BRA-Houston Agreement (April 2000)
COH owns 70% of water rights (62MGD) and BRAowns 30% (27MGD)
• TWDB financed the land acquisition and waterrights permit amended (2002)
• COH and BRA negotiate project terms/schedule(Nov. 2009 ~ ?)
Is our water at the right place?
COASTAL WATER AUTHORITYOF TEXAS
PASADENA
DEER PARK
BAYTOWN
TRINITYBAY
225
225
146
146
146
LIBERTY COUNTY
CHAMBERS COUNTY
HARR
IS CO
UN
TY
10
10 8
2354
1090
90
CO
UNTY
LIBERTY
ELLINGTONFIELD
SAN
JACINTOR
IVER
CEDA
RBA
YOU
LAKE H
OUSTON
RESERVOIRWALLISVILLE
HOUSTON SHIPCHANNEL
TRINITY
TRINITY RIVER PUMP STATION
LAKE HOUSTONPUMP STATION
LYNCHBURG PUMP STATIONAND RESERVOIR
SHIP CHANNEL CROSSINGEAST WATER
SOUTH EAST WATER
LEGEND:
CANAL
PIPELINE
ROADWAY
COUNTY
PURIFICATION
PURIFICATION PLANT
RIVER
INDUSTRIALAREAS
LINE
HOUSTON
SHIPCHANNEL
CHAMBERS
CO
UN
TY
PLANT
COASTAL WATERAUTHORITY
MAINTENANCEFACILITY
BAYPORTPUMP STATION
RED BLUFF WATERTREATMENT PLANT
File: Gen Vicinity Overview w Frame.dwg
Trinity River Pumping Station
Raw WaterConveyance
System
NEWPP80
EWPP350
SEWPP200
LakeHouston
150+12+36=198
TrinityRiver806
LakeConroe
60
NHCRWA/CHCRWA116 (82)
NFBWA20(1)
WHCRWA79(51)
2020 Surface Water Supply and Demand(in MGD)
34
19
60?
115 (35)
23
Raw Water60
COH371
28
46
256(46) 200327
69
Co-Part131
Luce Bayou Inter-Basin Transfer Project
In Region H and State Water Plan
Trinity River to Lake Houston (San Jacinto River)
Diversion at Capers Ridge
3.6 miles of dual 108” pipeline
24 mile long canal
Cost estimated at $294 million, including right-of-way, engineering andconstruction
The project will be financed by TWDB deferred low interest loans
All four Regional Water Authorities will share the cost proportion to theirrespective 2040 demand
CWA is contracted with the City to implement the project
Contractually guaranteed to be in service by June 2019
The project will be built to its ultimate capacity but pumps will be installed inphases
Estimated LBIBT Project Cost
Cost Sharing of Luce Bayou Project
City of Houston 69.8%
North Harris County Regional Water Authority 13.7%
Central Harris County Regional Water Authority 0.5%
West Harris County Regional Water Authority 9.5%
North Fort Bend Water Authority 6.5%
Total 100.0%
Resolution of Take Point Completed June 2009
Complete property boundary surveying/acquisition 31-Dec-10
Complete environmental field work Feb-10
Joint Evaluation Meeting 10-Feb-10
Complete Preliminary Engineering in support of 404 Submittal 31-Mar-10
Submit 404 Application to USACOE 31-Mar-10
Receive/Respond to Agency Questions and Comments on 404 Application July 1, 2010 to receipt of permit
Receive 404 Permit from USACOE April 2011 to March 2012
Complete Preliminary Engineering Report for CWA/COH/Co-Participant Approval Jul-10
LBIBT Project Status
What about treatment plantsand transmission systems?
Northeast Water Purification Plant Expansion
Current Capacity – 80 MGD
Capacity After Expansion – 300 MGD
Year Needed – No Later than June of 2019
Estimated Expansion Cost – $350 to $700 M
Cost will be shared by Regional WaterAuthorities
City of Houston Transmission Water Lines Constructed and Proposed
SWTP $93 million proposed FY 11 to 14
Questions?