SESSION 5. Flagstaff Water Management

Transcription

1 SESSION 5 Flagstaff Water Management Erin Young City of Flagstaff Erin is being contracted by the City of Flagstaff to fill the Water Resources Manager position. Erin has managed numerous projects while with the City that include groundwater flow modeling, scoping and soliciting feasibility work at the City s Red Gap Ranch, and the City s Adequacy projects. Erin continues the efforts of the City s involvement with working groups such as the Coconino Plateau WAC TAC, the Walnut Canyon Lake Mary Watershed TAC, and NAMWUA. Contact Information: eyoung@flagstaffaz.gov

2 City of Flagstaff s Contingency Plans for Drought Presented by: Erin Young, R.G. City of Flagstaff Utilities Division 21 February 2013 AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 1

3 Flagstaff s Contingency Plans Annual Operation Drought Preparedness Future Supplies Forest Health Reclaimed Delivery AZ Water Association Water Treatment Committee Seminar Series 2

4 Flagstaff s Contingency Plans Annual Operation Drought Preparedness Future Supplies Forest Health Reclaimed Delivery AZ Water Association Water Treatment Committee Seminar Series 3

5 Contingency Plan - Last 50 Years Wet vs Dry Year dependent on Upper Lake Mary reaching 65% or more of its capacity > 65% - Utilities utilizes Upper Lake Mary resource to its maximum (4.0 MGD) < 65% - Utilities operates groundwater wells as primary source AZ Water Association Water Treatment Committee Seminar Series 4

6 Upper Lake Mary has been at a >65% volume 24 times in past 53 years Historic Median Level in April: 55.4% AZ Water Association Water Treatment Committee Seminar Series 5

7 Contingency Water Production Plan Estimate evaporation loss from Upper Lake Mary Leave factor of safety for next water supply season and to satisfy agreement with U.S. Forest Service and National Park Service Operations Plan 2012 Annual (assumes target of 2011 use of ~8,300 AF/year or 7.4 MGD) Source Month Average Day (MGD) Annual Estimate (AF/yr) All Sources Jan April 6.0 2,207 Upper Lake Mary May - Dec Groundwater May Dec 7.0 5,136 Inner Basin May Dec ,300 Operations Plan Peak Day With IB Without IB Max Available 1 Inner Basin (IB) 2.0 MGD MGD MGD 3 Lake Mary W TP 3.0 MGD 3.0 MGD 3.0 MGD Lake Mary W ells 2.0 MGD 2.0 MGD 3.4 MGD Woody Mtn W ells 3.0 MGD 4.0 MGD 5.2 MGD Local W ells 5.0 MGD 5.0 MGD 5.3 MGD 15.0 MGD 14.0 MGD 16.9 MGD 1 Maximum water production capacity expected to be available in Assumes Inner Basin pipeline is fixed by summer Assumes Inner Basin pipeline is not fixed by summer 2013 AZ Water Association Water Treatment Committee Seminar Series 6

8 10-year Average ( ) AZ Water Association Water Treatment Committee Seminar Series 7

9 Average Production Over Life of Supply (or Period of Record) AZ Water Association Water Treatment Committee Seminar Series 8

10 Historical Production AZ Water Association Water Treatment Committee Seminar Series 9

11 Flagstaff s Contingency Plans Annual Operation Drought Preparedness Future Supplies Forest Health Reclaimed Delivery AZ Water Association Water Treatment Committee Seminar Series 10

12 Drought Preparedness Strategy I: when water demand is equal to or less than safe production capability (90% of total water resources available) Strategy II: In effect when water demand exceeds safe production capacity for five (5) consecutive days Strategy III: In effect when water demand exceeds total production capability, and the amount of water in storage may impair fire protection for the City AZ Water Association Water Treatment Committee Seminar Series 11

13 Drought Preparedness Strategy I: when water demand is equal to or less than safe production capability (90% of total water resources available) Implements Odd / Even Watering Schedule Prohibits unauthorized use of fire hydrants, wasting water, golf courses from irrigating with potable water Allows for new landscape permit AZ Water Association Water Treatment Committee Seminar Series 12

14 Drought Preparedness Strategy II: In effect when water demand exceeds safe production capacity for five (5) consecutive days Prohibits residential car washing, washing buildings and paved areas, filling fountains, ponds and pools with potable water Drought rate structure Single Family residential: 6,401 to 11,700 gallons billed at 150%, >11,700 gallons at 200% Multi-family, commercial, industrial, and institutional: Billed at 130% Standpipes: Billed at 130%, use limited to 25 miles radius AZ Water Association Water Treatment Committee Seminar Series 13

15 Drought Preparedness Strategy III: In effect when water demand exceeds total production capability, and the amount of water in storage may impair fire protection for the City In addition to rules under Strategies I & II prohibits all outdoor water use Authorizes additional measure as deemed necessary AZ Water Association Water Treatment Committee Seminar Series 14

16 Flagstaff s Contingency Plans Annual Operation Drought Preparedness Future Supplies Forest Health Reclaimed Delivery AZ Water Association Water Treatment Committee Seminar Series 15

17 100 Year Contingency Plan City of Flagstaff granted Designation of Adequate Water Supply by ADWR in 1973, required no hydrologic proof Red Gap Ranch Designation in 2011 with requirement to modify existing Designation for entire service area (pending) Groundwater Flow Model AZ Water Association Water Treatment Committee Seminar Series 16

18 100 Year Contingency Plan AZ Water Association Water Treatment Committee Seminar Series 17

19 100 Year Contingency Plan DRAFT AZ Water Association Water Treatment Committee Seminar Series 18

20 Flagstaff s Contingency Plans Annual Operation Drought Preparedness Future Supplies Forest Health Reclaimed Delivery AZ Water Association Water Treatment Committee Seminar Series 19

21 Forest Fire Contingency Plan System redundancy Loss of Inner Basin supply? Loss of Lake Mary? Loss of Lake Mary wellfield? Loss of Woody Mountain wellfield? AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 20

22 San Francisco Peaks Schultz Fire June 2010 ~ 24 sq.miles burned Governor Brewer declared Upper State Lake of Mary Emergency - July 2010 President Obama declared Disaster Area - October 2010

23 Flooding & Debris Flows City of Flagstaff inundate Water homes Adequacy 22

24 1990s Purpose & Objective Brief history of city water resources Proactive water resource planning What is sustainable? aging infrastructure water resources 1890s 1930s Site 16 Summer 2010

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26 Inner Basin Pipeline

27 Inner Basin Waterline Road & Pipeline Doney Park AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 26

28 AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 27

29 Pipeline Reconstruction & Relocation Project Inner Basin Pipeline Repair Project Team DESIGN-BUILD TEAM Hunter Contracting Co. & JACOBS Engineering Inc. INSPECTION SERVICES Shephard-Wesnitzer, Inc. Partnerships Arizona Game & Fish Department U.S. Fish & Wildlife Service U.S. Forest Service Coconino National Forest Federal Emergency Management Agency Arizona Department of Emergency Management Transwestern Pipeline Company AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 28

30 Pipeline Relocation Project 300 linear feet of pipeline destroyed within the Kachina Peaks Wilderness Area 3,600 linear feet of concrete pipe re-routed with high density polyethylene Estimated Relocation Cost: $600,000 Funded by USDA, USFS, Coconino NF, FEMA, ADEM, City AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 29

31 Pipeline Reconstruction Project Waterline Road damaged or impassable in 28 locations Estimated Reconstruction Cost: $3.9 Million Funded by FEMA, ADEM, & City of Flagstaff 75% Federal, 15% State, 10% City AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 30

32 Design Philosophy of Washed Out Drainage Crossings Consulted with Ann Youberg, Dan Nearly, and Karen Koestner Concepts considered: bridges, culverts Final Design allows for water and debris to flow over the road Photo Credit: City Utilities Division AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 31

33 Drainage Event Design Considered were 10, 25, 50, or 100-year storm events Final roadway design for drainage crossings is to a 50-year storm event AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 32

34 Site 2 33

35 Site 2 Photo Credit: City Utilities Division Photo Credit: Tom Alexander Photography AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 34

36 Site 22 SEPT 27, 2012 Photo Credit: City Utilities Division Photo Credit: Tom Alexander Photography AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 35

37 Waterline Road today Most Sites Rock gabbion baskets (each 3 feet tall) Pipeline encased in concrete AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 36 Photo Credits: Tom Alexander Photography

38 Future Monitoring Nine rain gauges located on the eastern side of the San Francisco Peaks Infer flood magnitude using the NOAA Atlas 14 Point Frequency Estimates for Arizona, used to determine return period for a given rainfall, based on elevation Map Colors represent BAER identified Basins of Concern AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 37

39 Closing Ceremony October 25, follow link to 2012 Updates Or: AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 38

40 Forest Fire Contingency Plan Prop 405 forest health Thin steep slopes of Mormon Lake Watershed and Dry Lake Hills Watershed 4 Forests Restoration Institute AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 39

41 AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 40

42 Flagstaff s Contingency Plans Annual Operation Drought Preparedness Future Supplies Forest Health Reclaimed Delivery AZ Water Association Water Treatment Committee Seminar Series 41

43 Reclaimed Water Contingency Plan Reclaimed Water over-allocated in summer months No formal cut-back structure Ask users to throttle back use during peak week prior to monsoons AZ Water Association Water Treatment Committee Seminar Series 42

44 Questions? Thank you! Erin Young (928) AZ City Water of Flagstaff Association Water Water Adequacy Treatment Committee Seminar Series 43