CITY OF SIOUX FALLS, SOUTH DAKOTA
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CITY OF SIOUX FALLS, SOUTH DAKOTA. Future Water Supply Evaluation. Presented to Sioux Falls City Council February 7, 2005. Overview of the Challenges Basis of Evaluation Summary of Alternatives Comparison of Alternatives Conclusions and Recommendations. Outline.

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Future water supply evaluation

CITY OF SIOUX FALLS, SOUTH DAKOTA

Future Water Supply Evaluation

Presented to

Sioux Falls City Council

February 7, 2005


Outline

Overview of the Challenges

Basis of Evaluation

Summary of Alternatives

Comparison of Alternatives

Conclusions and Recommendations

Outline

Future Water Supply Evaluation


Future water supply evaluation

Overview of the Challenges

Population Growth

Increased Water Demands

=


Future water supply evaluation

Overview of the Challenges

Susceptibility of Water Supplies to Dry Climate Conditions


Future water supply evaluation

Overview of the Challenges

Projected Water Supply Shortfalls

2012


Basis of evaluation

Basis of Evaluation

Planning Horizons

2062

2037

2012


Basis of evaluation1

Basis of Evaluation

Past Population Growth Trends

2004 Pop.137,500

2.5% Average Growth

1900 Pop.10,266

Actual Census Population

YEAR


Basis of evaluation2

Basis of Evaluation

Population Projections

2062443,303 pop.

2037281,024 pop.

2012166,398 pop.

2.06% to 1.71%

2025

2062


Basis of evaluation3

Basis of Evaluation

Water Demand Projections

2002 Peak Day = 52.1 mgd (387 gpcd)

387

387

387

387

341

304

Water Demand (gpcd*)

195

155

Conditions

*gpcd = gallons per capita per day


Basis of evaluation4

Basis of Evaluation

Water Demand Projections

ProjectedPopulation

Per CapitaDemand

ProjectedDemand

=

X

# of people

gallons per capita per day(gpcd)

gallons per day

=

X


Basis of evaluation5

Basis of Evaluation

Water Demand Projections

Basis of Water Treatment Planning

Basis of Water Supply Planning


Basis of evaluation6

Basis of Evaluation

Projected Water Demand Shortfalls

2062 Water Demand2037 Water Demand Available Supply

Treatment Planning

Supply Planning

151

135

72

86

60

96

69

Water Demand (mgd)

22

85

55

29

44

72

63

26

13

Drought

AverageDry

Conditions


Basis of evaluation7

Basis of Evaluation

Steps of Evaluation Process

  • Identification of Infrastructure Capacity Requirements

    • 2037 Planning Horizon

    • 2062 Planning Horizon

  • Water System Concept Development

    • Supply (surface water vs. groundwater)

    • Transmission Pipelines Pumping/Storage Facilities

    • Water Treatment Facilities

    • Delivery to the Sioux Falls WPP

  • Preparation of Opinions of Total Probable Project Costs

  • Estimation of Incremental O & M Costs


Summary of alternatives

Summary of Alternatives

Considered Alternatives

Lewis & Clark RuralWater System (LCRWS)

Missouri River Pipeline

LCRWSw/ Limited Federal Funding

Missouri River Pipelinew/ Consecutive Users

LCRWSw/ Limited Expansion Capacity


Summary of alternatives1

Summary of Alternatives

Overview of LCRWS Project

Initial Capacity10 MGD

System Expansion

Program Funding

Commitment


Summary of alternatives2

Summary of Alternatives

Missouri River Pipeline Concept

FutureUsePermit

Water SupplyAlternatives1977

Gavin’s Point Dam


Comparison of alternatives

Comparison of Alternatives

Capital Cost Comparison(2004 Dollars)


Comparison of alternatives1

Comparison of Alternatives

Comparison of Alternatives


Conclusions and recommendations

Conclusions and Recommendations

  • A water supply shortage is projected by year 2012 and will become more pronounced with anticipated community growth

  • Securing near-, mid-, and long-term supplemental water supplies is recommended

  • The LCRWS Alternative is least costly on a present worth analysis basis

  • Continued participation in the LCRWS Project is recommended

  • Interim financing may be necessary to receive initial water service from LCRWS


Conclusions and recommendations1

Conclusions and Recommendations

  • The initial capacity received from LCRWS is projected to meet water supply demands through year 2016

  • Additional capacity may be available through expansion of the LCRWS and is more cost-effective than independent supplemental water supply strategies

  • A commitment from LCRWS regarding the magnitude and timeline of additional capacity should be obtained as soon as possible

  • Eventually, an independent supply from the Missouri River will be required

  • Due to uncertainties of expanding the LCRWS, planning efforts to obtain supplemental capacity from the Missouri River should be initiated


Future water supply evaluation

Questions?


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