Lake Treatments and Status of Project. Treatments to be Implemented Four different treatments to stormwater basins within the Grand Haven community. –Aeration.

Lake Treatments and Status of Project

Treatments to be Implemented

• Four different treatments to stormwater basins within the Grand Haven community.

– Aeration

– Littoral Shelf Planting

– Submerged Aquatic Vegetation (reduce or eliminate grass carp)

– Copper Sulfate

Treatments(Aeration)

• Ponds 2,19 and 20– Solar and land line electric will be used– Cost was very high to run electric to some

ponds

• Mechanism of effect– Increase water column dissolved oxygen to

improve habitat– Create aerobic sediment to sorb phosphorus

• Uncertain effect– Sediment oxidation may release nutrients and

copper.

Treatments(Littoral Shelf Planting)

• Ponds 6, 7 and 17• 6,800 plants• Mechanism of effect

– Compete for light in shallow water– Compete for nutrients– Aesthetic visual alternative– Aquatic habitat

List of Plant Species

Botanical Name Common Name

VerticalPlanting

ZoneShoreline

Planting Zone Origin  

Canna flaccida Golden Canna A Universal native

Iris virginica Blue Flag Iris A Universal native

Juncus effusus Soft Rush A Universal native

Eleocharis interstincta Jointed spikerush B+ Universal native  

Panicum hemitomon Maidencane B+ Universal native  

Pontederia cordata Pickerelweed B Universal native  

Sagittaria lancifolia Duck Potato B Universal native  

Scirpus californicus Giant Bullrush B- Property Line native  

Scirpus validus Soft-Stem Bullrush B Universal native  

Thalia geniculata Alligator Flag B Property Line native  

Nuphar luteum Spatterdock C- Universal native  

Nymphaea odorata White Water Lily C+ Universal native  

Plant Distribution

Shoreline Planting Zones

Pro

pe

rty

Lin

e Z

on

e

Pro

pe

rty

Lin

e Z

on

e

Pro

pe

rty

Lin

e Z

on

e

Slope

Break

NWL

NWL

Slope

Break

Bottom

T.O.B.

NWL1’

4:1

3:1

2.5’

1’

A

B

C

Vertical Planting Zones

A

C

B

A

C

B

Treatment(Submerged Aquatic Vegetation)• Ponds 1, 3 and 4

• Ponds with older carp that were not restocked in 2005 or 2007

• Mechanism of action– SAV blocks light and competes for

nutrients– Provides aquatic habitat

Existing Treatment(Copper Sulfate)

• Ponds

• Copper Sulfate will be applied on an “as needed basis” consistent with existing protocols.

• Treatments will be documented and amount of Copper Sulfate applied will be recorded.

Implementation Timeline

• All treatments have been initiated– Aerators

• March

– Littoral Shelf Planting• March

– Carp/SAV• Continued without restocking

– Copper Sulfate• Continuation of existing management

Alternative Pond TreatmentsAlternative Pond Treatments

Littoral Shelf PlantingLittoral Shelf PlantingAerationAeration Carp Control / SAVCarp Control / SAV Copper SulfateCopper Sulfate