2010 10-21 meeting long term water demands

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

• 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

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

Map contoured in 1 Foot Intervals HGCSD GWMP

Subsidence in Feet1906 - 1995

Data Source: National Geodetic SurveyContour Interpretations: HGCSD

Area 3 Predicted Subsidence1995 - 2030

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

1985 1990 2000 2010 2020 2030

Average Day Demand

9701080

715840

Water Demand ForecastCOH 1996 Study

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

Montgomery Watson

Modified TWDB

Water Demand Forecast

ARC Regression Method

250270290310330350370390410430450

1980 1985 1990 1995 2000 2005 2010Year

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

2010 2020 2030 2040 2050

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

LIBERTY COUNTY

CHAMBERS COUNTY

LIBERTY

ELLINGTONFIELD

JACINTOR

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:

PIPELINE

ROADWAY

COUNTY

PURIFICATION

PURIFICATION PLANT

INDUSTRIALAREAS

HOUSTON

SHIPCHANNEL

CHAMBERS

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

NHCRWA/CHCRWA116 (82)

NFBWA20(1)

WHCRWA79(51)

2020 Surface Water Supply and Demand(in MGD)

115 (35)

Raw Water60

COH371

256(46) 200327

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?

2010 10-21 meeting long term water demands

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