TWCA Annual Conference Mark L. Loethen, P.E., CFM, PTOE Deputy Director - City of Houston Planning & Development Services Division Public Works & Engineering Department

1. 2011 DROUGHT
CHALLENGES AND PLANS FOR
CITY OF HOUSTON
Mark L. Loethen, P.E.
Deputy Director, Public Works &
Engineering

2. Today’s Presentation
y
Water Supply – Houston Style
Summer 2011
Upstream Issues
Downstream Issues
Future Projects
Q
Questions
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3. WATER SUPPLY – HOUSTON STYLE
Houston Service Area 635+ square miles
Population Served 2.1 million+
4th Largest City in the United States
3

4. Houston Ground Water Wells
Water
Main Water Supply System
pp y y
◦ 103 Water Wells
◦ Actual Production Capacity (175 MGD)
Isolated Water Supply Systems
◦ 28 Water Wells
◦ Actual Production Capacity (44 MGD)
4

5. Houston Surface Water
Water
Lake Conroe
(1973) Lake Livingston
(1971)
Lake Houston (1953)
5

6. Houston Water Treatment
Water
East Water Purification Plant
350 MGD
Northeast Water Purification
Southeast Water Purification Plant Plant 80 MGD
120 MGD
200 MGD
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7. Houston Treated Water
Water Delivery
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8. Houston Strategic
Water Partnerships/Customers
8

9. SUMMER 2011- UPSTREAM
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10. Supply: Groundwater
154
MGD
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11. Storage Supply: Lake Livingston
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12. Storage Supply: Lake Conroe
COH Requests
150MGD
Release
COH Requests
Reduction to COH Requests
60 MGD Reduction to 0
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13. Storage Supply: Lake Houston
Minimum 36.25
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14. SUMMER 2011- DOWNSTREAM
WN
1
4
Photos from Seattle & Florida

15. 700
Daily Production by Facility (MGD)
Stacked Data
600
500
400
300
Average Monthly Production (MGD)
EWPP NEWPP SEWPP GW-M GW-I
Total
200
May 281 65 99 47 15 507
June 301 67 110 85 18 581
July 294 65 111 93 17 581
Aug 292 67 112 137 19 628
100 p
Sept 306 65 117 119 18 624
Oct 288 68 102 37 14 509
Nov 249 67 101 28 11 457
Dec 230 61 95 18 9 412
Jan 204 59 70 45 8 387
0
Feb (MTD) 226 36 67 55 8 380
May
May
May
Aug
Aug
12-Jun
26-Jun
Oct
Oct
Nov
Nov
Jul
Jul
Sep
Sep
Oct
Jan
Jan
Feb
Feb
Dec
Dec
2-O
16-O
30-O
10-J
24-J
1-M
15-M
29-M
11-D
25-D
13-N
27-N
8-J
22-J
5-F
19-F
4-S
18-S
7-A
21-A
EWPP NEWPP SEWPP GW Main GW Isolated Plants

16. Water Conservation
Stage 1 – Voluntary Conservation
• Initiated in June 2011
Stage 2 – Mandatory Restrictions
• Initiated in August 2011
Combined reservoir storage is ~24 months
supply for 10 consecutive days
Average water production is 80% of pumpage
capacity for 3 consecutive days
Average water system pressure is less than 45
psi
• Repair detectable leaks within 72 hours of discovery
• Limit outdoor irrigation to 2 days per week
• Rescinded in January 2012
Stage 3 – Not reached
Combined reservoir storage is ~18 months supply
Stage 4 – Not reached
Combined reservoir storage is ~12 months supply
16

17. System Fact: Houston has
Repairs: Prior to 2011 6,785 miles of waterlines
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18. Repairs: 2011
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19. FUTURE WATER PROJECTS
W
1
9

20. Future Water Supply Projects
Luce Bayou
Interbasin
Transfer
Project
20

21. Future Water Supply Projects
Allens
Creek
Reservoir
21

22. Future Water Supply
Direct and Indirect Water Reuse
Desalination ?
Further Water Conservation
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23. QUESTIONS ?
2
3