Water Resources Assessment & Issues

September 16, 2010

Coon Creek Watershed District

Purpose Tonight

1. Bring you up to date2. Brief you on what we’ve learned3. Seek input

Agenda1. Intro to CCWD

2. Water Resource Assessment

3. Issues

4. Needs

Coon Creek Watershed 92 sq mi. (58,880 acres)270 miles of open channel363 miles of pipe16,800 acres of lake & wetland

Mission StatementTo manage groundwater and surface water

systems to:

Prevent property damage

Maintain hydrologic balance

Protect water quality for the safety and enjoyment of citizens & the preservation and enhancement of wildlife habitat. 1990

Planning mandates

Comprehensive Management Plan

Watershed DistrictWatershed Act

(M.S. 103D)

WMOMetropolitan Water

Management Act(M.S. 103B)

MS4Clean Water ActNPDES-SWPPP

(40 CFR 112)

Water ResourcesChanges in ConditionsAvailable online: www.cooncreekwd.org

ReviewsCurrent Plan2000-2009 Changes & TrendsImplications of Changes & Trends2020 Management Expectations

Issues

Physical

ManagementSocial

Physical Issues: Supply & Capacity Concerns

Hydrology BiologyGeologyChemistry

Word of the Day: Biogeochemisis

Supply Issue

Less annual precipitationGreater occurrence of larger precipitation events over smaller areas

Annual Precipitation (Last Decade)

y = -0.4053x + 33.5350.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

40.00

45.00

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

Pre

cip

(in

.)

Annual (Last decade) Linear (Annual (Last decade))

Supply Issue

Surficial Groundwater Scarcity

800

810

820

830

840

850

860

870

880

890

900

910

920

Round

Lk Bld

Hanso

n

Univer

sity

Centra

l

Lexin

gton

Sand

Clay

Supply Issue

Surface Water

Social Issues

Issues of Direct & Indirect Demand

Demand Issues

Direct

Drainage

Water Source

Recreation

Indirect

Flood Control

Groundwater Recharge

Water Quality

Drainage: Decrease in Acres, Increase in Need

Direct Demand Issues

Direct-Demand

Water Source

Increase in Demand

Indirect Demand Issues

Flood ControlMore “localized” Regional flood events

(Andover x Ham Lake)

Groundwater RechargeNeed approximately 10 to 15,000 AFPY for

10 years to return to 1988 elevations

Indirect Demand Issues

TMDLDevelopBiota

MaintainVolume

MaintainDissolved Oxygen

2.5ReducePhosphorus

8ReduceTSS

3ReduceTurbidity

FactorNeedWater Quality

Management Issues

Technology & Know-HowFundingRegulationPublic RelationsAllocation & Decision Making

Management IssuesTechnology & Know-how

Groundwater x Surface water modeling

Large-scale infiltration

Infiltration/Groundwater recharge for target water body

Management IssuesFunding

Equitable & sufficient financing approaches

thatreflect full economic value of water resource

Management IssuesPublic Relations

Informing the public about ways to reduce stormwater pollution

Involving the public in stormwater management

Management IssuesRegulation

Facilitating required changesInfiltration/water conservationMinimum Impact Development Standards

(MIDS)Impaired water goalsAnti-Degradation GoalsCoordinated water planning

Management IssuesGovernment Relations

Increased Coordination & Collaboration inProjectsProgramsFunding

Sustainable Issues

Control post development peak to predevelopment rate

Evaluate 100 yr event

FloodplainOverbank Flood Protection

Extreme Storm

Reduce erosive velocities & unstable conditions

Ditches & DrainageChannel Protection

NeedIssue

Deteriorating Issues

Retain some of the load by retaining volume

Erosion & Sed. Control

NeedIssue

Serious Issues

Infiltrate to predevelopment Soil Hydro group or greater

Retain some of the load by retaining volume

Groundwater

Wetlands & Lakes

Water Quality

NeedIssue

Types of IssuesTypes of Issues

Existing conditions require immediate attention because

2. They are a serious threat

And/or

6. There is no known technology or management strategy for dealing with them

1. Management and technology are not expected to keep pace with demands for resource uses,

and/or

5. Resource conditions will deteriorate in the future

Management can sustain existing conditions and/or projected levels of use

SeriousDeterioratingSustainable

Serious ConditionSerious ConditionGroundwater

SustainableSustainableFloodplain

DeterioratingSustainableErosion & Sed. Control

SustainableSustainableWildlife

Serious ConditionDeterioratingWetlands & Lakes

Serious ConditionSustainableWater Quality

SustainableSustainableDitches & Drainage

20102000Resource

Questions?

www.cooncreekwd.org

info@cooncreekwd.org

Types of IssuesTypes of Issues

Require immediate attention

• They present serious problems

• There is no known management strategy or technology for dealing with them

1. Future management and technology are not expected to keep pace with demands for resource uses,

and/or

5. Resource conditions will deteriorate in the future

Existing conditions and projected levels of use can be sustained with current and expected future levels of management.

SeriousDeterioratingSustainable