2011 DROUGHTCHALLENGES AND PLANS FOR

CITY OF HOUSTONCITY OF HOUSTON

Mark L. Loethen, P.E.Deputy Director, Public Works & EngineeringEngineering

Today’s PresentationyWater Supply – Houston StyleWater Supply Houston Style

Summer 2011

Upstream Issues

Downstream Issues

Future Projects

QQuestions

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WATER SUPPLY – HOUSTON STYLE

Houston Service Area 635+ square milesHouston Service Area 635+ square milesPopulation Served 2.1 million+4th Largest City in the United States

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Houston Water

Ground Water WellsWaterMain Water Supply Systempp y y◦ 103 Water Wells◦ Actual Production Capacity (175 MGD)

Isolated Water Supply Systems◦ 28 Water Wells28 Water Wells◦ Actual Production Capacity (44 MGD)

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Surface WaterHouston WaterWater

Lake Livingston (1971)

Lake Conroe (1973)

Lake Houston (1953)

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Water TreatmentHouston WaterWater

East Water Purification Plant 350 MGD

Southeast Water Purification Plant 120 MGD

Northeast Water Purification Plant 80 MGD

200 MGD

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Treated Water Delivery

Houston Water DeliveryWater

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Strategic Partnerships/Customers

Houston Water Partnerships/CustomersWater

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SUMMER 2011- UPSTREAM

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Supply: Groundwater

154 MGDMGD

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Storage Supply: Lake Livingston

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Storage Supply: Lake Conroe

COH Requests 150MGD Release

COH Requests Reduction to

60 MGDCOH Requests Reduction to 0

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Storage Supply: Lake Houston

Minimum 36.25

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SUMMER 2011- DOWNSTREAMWN

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Photos from Seattle & Florida

700

Daily Production by Facility (MGD)Stacked Data

500

600

400

300Average Monthly Production (MGD)

EWPP NEWPP SEWPP GW-M GW-I

100

200Total

May 281 65 99 47 15 507June 301 67 110 85 18 581July 294 65 111 93 17 581Aug 292 67 112 137 19 628Sept 306 65 117 119 18 624

0

100

May

May

May un un Ju

l

Jul

Aug

Aug

Sep

Sep

Oct

Oct

Oct

Nov

Nov Dec

Dec Jan

Jan

Feb

Feb

pOct 288 68 102 37 14 509Nov 249 67 101 28 11 457Dec 230 61 95 18 9 412Jan 204 59 70 45 8 387Feb (MTD) 226 36 67 55 8 380

1-M

15-M

29-M

12-J

26-J

10-J

24-J

7-A

21-A 4-

S

18-S 2-

O

16-O

30-O

13-N

27-N

11-D

25-D 8-

J

22-J

5-F

19-F

EWPP NEWPP SEWPP GW Main GW Isolated Plants

Water ConservationStage 1 – Voluntary Conservation

• Initiated in June 2011

Stage 2 Mandatory RestrictionsStage 2 – Mandatory Restrictions• Initiated in August 2011

Combined reservoir storage is ~24 months supply for 10 consecutive daysAverage water production is 80% of pumpagecapacity for 3 consecutive daysAverage water system pressure is less than 45 psipsi

• Repair detectable leaks within 72 hours of discovery• Limit outdoor irrigation to 2 days per week • Rescinded in January 2012

Stage 3 – Not reachedCombined reservoir storage is ~18 months supply

Stage 4 – Not reached

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Stage 4 Not reachedCombined reservoir storage is ~12 months supply

Repairs: Prior to 2011 System Fact: Houston has 6,785 miles of waterlines

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Repairs: 2011

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FUTURE WATER PROJECTSW

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Future Water Supply Projects

Luce Bayou InterbasinTransferProjectProject

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Future Water Supply Projects

AllensCreekReservoir

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Future Water Supply

Direct and Indirect Water Reuse

Desalination ?

Further Water Conservation

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QUESTIONS ?

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