1. Castle Pines North Metropolitan District
Integrated Water Resources Plan
Community Meeting No. 2
January 23, 2006

2. 1. Introductions

3. Agenda Introductions Review Public Meeting #1
Castle Pines North’s water supply and the Integrated Water Resources Plan
Groundwater Analysis
Water Supply Alternatives for CPNMD
Water Supply, A Statewide Perspective
CPNMD Project Financing Options
Integrated Water Resources Community Participation Committee
Upcoming IWRP Project Activities and Community Information Meetings
Questions and Comments

4. Content & Objectives of Each Community Meeting
Meeting No. 1 – November 7, 2005
Introduced Integrated Water Resources Plan (IWRP)
Presented overview of supply and demands
Meeting No. 2 – January 23, 2006
Provide initial results of groundwater analysis
Present preliminary alternatives
Additional Meetings – Spring-Summer 2006
Discuss recommended alternatives
Present Draft IWRP
Finalize IWRP

5. Integrated Water Resources Plan Tasks
Evaluate past, current, and future water demand
Evaluate water conservation strategies
Evaluate long-term sustainability of the District's existing groundwater supply using a groundwater model
Evaluate other water supply options and find the optimum "grouping/portfolio" of options that best meets the needs of the community

6. 2. Review Public Meeting #1

7. Public Meeting #1 What is the Integrated Water Resources Plan?
Castle Pines North Metropolitan District's Existing Water Supply and Demands
The IWRP Process
Potential Supply Options

8. CDM’s Integrated Water Resources Planning
Identify key decision makers & stakeholders
Define objectives and weigh them according to stakeholder preferences
Develop evaluation framework to aid in decision-making process
Identify all feasible supply and demand- management options
Conduct conceptual or feasibility level engineering analysis
Combine options into complete alternatives to be evaluated against objectives (criteria)
Use appropriate decision models and tools
Evaluate alternatives in terms of supply reliability, cost, water quality, implementation, environmental impacts, and other attributes
Show trade-offs between alternatives
Identify risk scenarios
Demonstrate how alternatives respond to risk
Identify priority elements (projects) that perform well under all scenarios
Develop adaptive strategy for remaining elements based on risk triggers
Define Objectives and Framework
Build Alternatives
Evaluate Alternatives
Develop Strategy

9. Historic and Projected CPNMD Water Demands

10. Current CPNMD Water Use by Customer Type

11. CPN Monthly Water Demands50
100
150
200
250
300
350
400
Jan-99
Jan-00
Jan-01
Jan-02
Jan-03
Jan-04
Acre-ft
Summer Demands > 6x Winter Demands

12. The Bottom Line on our Supply and Demand
Groundwater is not "running out" but it will cost more in the future
Challenge in meeting peak demands
Regional issue affecting Douglas and Arapahoe Counties
CPNMD is conducting an Integrated Water Resources Plan (IWRP) to prepare for the future
Regional solutions and partnerships are being formed now

13. 3. Castle Pines North’s water supply and the Integrated Water
Resources Plan

14. Existing Water Supply and Demand Management
Groundwater
Conservation
Recycled Water
The Ridge Golf Course

15. Existing Supply
Groundwater is currently CPNMD's only source of water supply
10 active wells
3 million gallons of storage
Wells to treatment then pumped to storage
CPNMD's existing groundwater supply is nonrenewable
Groundwater is not "running out" but it will cost more in the future if groundwater levels continue to decline
More wells, more energy needed to pump water at deeper levels, reduction in well yield, and higher maintenance costs

16. Castle Pines North Water System Development - Historical Perspective
Why non-tributary groundwater?
No large provider (Denver, Aurora) willing to serve the area
Valuable resource
Readily available
Develop incrementally
Relatively low cost for initial development
Protected from contamination
Drought resistant

17. 4. Groundwater Analysis

18. Denver Basin Aquifers and CPNMD
The Setting:
Denver Basin Aquifers and CPNMD
CPNMD
Dawson
Denver
Arapahoe
Laramie-Fox Hills
Alluvial

19. The Setting: South-North Cross-section through CPNMD
Dawson
Denver
Arapahoe
L-FH
Castle Pines
Greeley

20. West-East Cross-section through CPNMD
The Setting:
West-East Cross-section through CPNMD
Laramie-Fox Hills
Arapahoe
Denver
Dawson
Castle Pines
North
West
East

21. Aquifer porosity and water storage – Ground water moves through connected pores and fractures in rock

22. Ground water overview – Confined and Unconfined Aquifers
stays fully saturated
water rises above physical top of aquifer
water under pressure
Unconfined Aquifer
water table level defines top of saturated materials
water at atmospheric pressure only

23. Aquifer storage coefficient – Water yield increases per foot of drawdown when an aquifer converts from confined to unconfined
Unconfined
Aquifer
Confined
Aquifer
Dewatering of Aquifer
Release of Aquifer Pressure

24. Change in Aquifer Drawdown when well goes from Confined to Unconfined – Well A-1

25. Change in Aquifer Drawdown when well goes from Confined to Unconfined – Well A-3

26. Estimating Lifetime of the Existing Wellfield
Lower ground water levels will eventually decrease production of individual wells
New wells will be needed to meet existing peak demands
Timeframe of existing wellfield is estimated using in-well measurements plus regional modeling
Regional modeling based on South Metro model and pumping demands included in it

27. Percentage of Pumping in South Metro Model5% 4%
19%
14% 1% 2%
10%
15% 7
CPNMD

28. Predicted Pumping by South Metro Providers, Year 2050 as simulated in South Metro Model – Average Scenario

29. Modeled Water Levels near CPNMD due to South Metro Regional Pumping - Average Scenario

30. Modeled Ground Water Levels, Year 2050 – Average Scenario
CPNMD

31. Comparison of Highest and Average Pumping Scenarios, South Metro Groundwater Model

32. Potential Wellfield Production Affected By Decrease in Aquifer Water Levels
- Improvements to wells A-1 & A-3
- Add well A-5
- Deeping/improving pumps
- Drill additional wells
- Obtain renewable supplies

33. What is CPNMD Doing to Address This?
All entities are or will experience declines in well production
CPNMD taking measures to address issue
Improvement to Wells A-1 and A-3 in 2006
Bringing Well A-5 on-line in 2007
Potential for lowering/improving pumps
Continued conservation measures
Conducting IWRP to identify renewable supplies

34. Conclusions from Groundwater Evaluations
Groundwater levels will decline regardless of CPNMD pumping
CPNMD responsible for < 10% of the projected groundwater decline in the Castle Pines area
CPNMD has less than 5 years before action must be taken to maintain existing production rates
Drilling more wells:
Needed to maintain pumping rates
Very costly (~ $1.5M per well; current costs $540K per year)
Does not achieve water sustainability

35. 5. Water Supply Alternatives

36. Why Are Renewable Sources Important to CPNMD?
Provides for the sustainability and reliability of CPNMD’s water system
Protects and enhances property values
Protects the quality of life

37. Why now, if groundwater supplies are sufficient for the near future?
Pumping rates from wells will decline
Investment in additional wells will be needed to maintain system capacity – higher costs
Competition for surface water will drive prices upward
Lengthy process to implement renewable supply
The sooner demands on groundwater are reduced, the longer they can remain a viable part of CPNMD’s supply

38. CPNMD Water System Development
The District is responsible for ensuring a safe, reliable and adequate water supply for their customers
Goal is to identify the best mix of future sources and conservation measure to sustainably meet our community’s water needs
Additional supplies needed to serve CPNMD
Provide for perpetual and cost-effective water supply
Seek partnering opportunities with other water providers

39. The Integrated Water Resources Plan will build integrated alternatives
Renewable
Sources
Ground- water
Conservation
Buildout
Existing
Reuse
Alternatives – combinations of supply options – basin by basin and statewide
Organized around themes
"Building Blocks" – examples shown here, may be some additional
Combine into complete alternatives centered around a theme. Examples…

40. 6. Water Supply, A Statewide Perspective
FLIPCHART AGENDA
FLIPCHART PARKING LOT
Welcome and thanks to participants
Thanks also to hosts ____________________
Self intro
Intros:
- CWCB Board Member - ______________
- Rod Kuharich – CWCB Director
- Rick Brown – CWCB Project Manager
- Basin Advisors - _______________
- LEGISLATORS? Other CWCB Board Members in attendance?
- CDM team
Review/refine agenda
OK to interject – looking for input, feedback, dialog

41. Significant Increases in Colorado’s Population will Intensify Competition for Water

42. History of South Platte/Clear Creek Water Rights Cost and Availability

43. Municipal & Industrial Water Demand by Basin - 2000 - 2030
630,000 AF
Increase

44. 2030 Municipal & Industrial Water Demands and Gaps
Yampa/White/Green
North Platte
South Platte
Colorado
Gunnison
Dolores/ San Juan/ San Miguel
Rio Grande
Arkansas
107,600 AF
10,300 AF
Identified Projects
404,300 AF
Gap 107,800 AF

45. Sources to Meet Future Statewide Demands
Water Conservation
Water Reuse
New Storage
Trans-basin Diversions
Agricultural Transfers
Conjunctive Use of Groundwater and Surface Water

46. Front Range Water Providers actively seeking renewable or more reliable supplies for existing customers
Halligan-Seaman Water Management Project
Windy Gap Firming Project
Denver Northern Firming Project
City of Northglenn
Aurora South Platte Project
East Cherry Creek Valley Northern Water Supply Project
Parker Rueter-Hess Reservoir
South Metro Water Providers
El Paso County Water Providers
Colorado Springs Southern Delivery System

47. Potential Sources of Renewable Supplies
Colorado River Basin
Transbasin deliveries from Upper Blue River to Upper South Platte with Combined Storage and Pipeline
Lower South Platte
Fallowing program and water rights acquisition, gravel pit storage and pipeline
Rueter-Hess Reservoir
Upper Arkansas River
Water rights acquisition with storage and pipeline to Upper South Platte Drainage
Upper Cherry Ck and Plum Ck
Water rights acquisition with storage & pipeline
Upper South Platte Basin
Water rights acquisition with storage and pipeline
Lower Arkansas River Basin
Fallowing and water rights acquisition with storage and pipeline

48. Storage Alternatives: Chatfield, Rueter-Hess

49. Conclusions and Observations
CPNMD's water supply future is tied in with the South Metro providers
CPNMD needs to support the efforts of all South Metro providers to find renewable sources
Providers, such as Parker, ECCV and Centennial are involved with renewable water supply projects
Other providers such as Castle Rock are actively seeking renewable sources
CPNMD may partner with one or multiple entities to develop renewable supplies

50. Conclusions and Observations - continued
Groundwater pumping by others cannot be controlled and impact CPNMD pumping yields
The Integrated Water Resources Plan is a proactive approach to addressing CPNMD’s need for a renewable supply
Increase water supply reliability
Enhance property values
Maintain quality of life

51. Conclusions and Observations - continued
Renewable water sources will:
Be needed in the future
Become more expensive
Become more scarce due to competition for the limited available supplies
The longer CPNMD takes to act:
Less renewable supply options
Go farther for water
More costly
Partnership opportunities reduced or eliminated

52. 7. CPNMD Project Financing Options

53. Financing Alternatives for Renewable Water Supply Development

54. 8. Integrated Water Resources Community Participation Committee

55. 9. Upcoming IWRP Project Activities and Community Information Meetings

56. For additional information or to provide comments:
Contact:
Castle Pines North Metro District
James McGrady, District Manager
, ext. 11
Visit:
the CPNMD web site at