Direct Demands continued

Mining

Public Land

Recreation

Mining

Mining- Review of Current Plan

Very general

NotesSand

Black Dirt

Current Mines

Mining - Trends

FlatExtraction (NSC/Rehbein)

Excavation/Conversion

(The Lakes & Emily’s Waters)

Mining - Trends

Demand for

1. Dewatering

2. Water

Mining - Implications of Trends

Land Subsidence

Mining - Implications of Trends

Decrease in Groundwater Supplies

Mining - Implications of Trends

Increase in Evapotranspiration

Mining - Implications of Trends

Changes in Wetlands, Lakes, Trees and Parks

Mining - Expectations for Future Management1. Use sources other than groundwater (Partially

or entirely)

2. Import water

Mining - Expectations for Future Management

Changes in

rates

time and

spatial distribution

of pumping

Mining - Expectations for Future Management

Increase recharge (Infiltration zones)1. Recharge of surface water or reused water

(ground water or surface water)

Mining - Expectations for Future ManagementDecrease discharge

from groundwater

1. Decrease loss to evapotranspiration

2. Decrease potential loss to ET

Recreation Lands

Current Recreation Lands

Recreation -Review of Current Plan

Plan does not directly address recreational lands or uses of watershed resources

Facility Type # Acres Pct

Golf Courses 4 1,383 7%

Regional Parks 3 16,766 84%

City Parks 141 1,767 9%

Total 147 19,916

Recreation - Trends

Increase in navigation of the Creek

Increase in Lake use

Increased evaluation of ditch corridors for trail purposes

Recreation - Expectations for Management

Increased requests/complaints about keeping the channel clear

Need to discussPart of 103D mission but numbers are small

Public Land

Public Land - Current Plan

Public land and recreation facilities addressed together

Cites 10,000 acres of Public Land

GIS=11,687 acres

20% of watershed

Public Land - Trends

No additional acreage

Changes in operation & managementWatering

Use of chemicals (Highways)

Public Land Implications for Management

Contribution to loadings and associated costs becomes an issue

Increased need for SWPPPs/SAMPs

Public Land - Expectations for Management of Water

New ground for some public managers

Politics of Operations & Maintenance

Indirect DemandsFlood Control

Groundwater Recharge

Water Quality

Property Damage Avoided

Flood Control

Flood Control - Current PlanMaintain existing 100-year floodplain profiles

“No-net loss” of volume policy

Requires a permit to alter floodplain

100-yr elevations depend on maintained system

Flood Control - Current Plan

Management Principles1. ID Floodplain

2. ID Impact

3. Require replacementBy Volume

Within Relevant Reach

Flood Control - Trends

‘The Lakes’ decreased amount of floodplain by 1,000 acres

Drought has influenced flooding in last 10 years

Flood Control - Trends

Ponding has reduced peaks + sustained flows at lower elevations

Infiltration will decrease volume

Flood Control - Implications

If climate is changing, could experience:

More “localized” Regional flood events

Storms outside the “normal” distributionHigher Highs

Lower Lows

Flood Control - Expectations for ManagementPublic comment/pressure on

Dry ponds

Over-designed ponds

Unused

Restricted Land & Floodplain

Encumbered

Why are we paying to have Bart inoculated against

diseases he never gets?

Homer Simpson

Groundwater Recharge

Groundwater Recharge Current Plan

Focus on flood prevention from high water table

Recognizes varying availability of groundwater

Requires first inch infiltrated

Groundwater Recharge -Trends

Fewer areas not ‘hardened’ by development

Groundwater Recharge Implications

The only way to influence surficial groundwater

Various methods will need to be considered

Groundwater Recharge Expectations for Management

Could become a major activity of District

Water Quality Improvement & Stormwater Protection

Water Quality & Stormwater Current PlanRegulate land management practices

Keep disturbed areas small

Stabilize soils ASAP

Require pretreatment

Standards are non-specific

Water Quality & Stormwater Current Plan

Keep Velocities low

Maintain existing flood profilesUse combination of successive BMPs

Utilize natural infrastructure within their capability

Require infiltration

Water Quality & Stormwater Trends

Flush effect in lower watershed

Increase in several parameters

Storm Related

Water Quality & Stormwater - ImplicationsExceeding standards for

Turbidity

Total Suspended Solids

Phosphorus

Lower (older) portion of the watershed lacks infrastructure needed for water quality

Water Quality & Stormwater - Expectations“Impaired” listing for

Turbidity

Phosphorus

Active retrofitting lower creek

Creative infrastructure/close coordination with City

Questions?

Thank You

Coon Creek Watershed District