lake treatments and status of project. treatments to be implemented four different treatments to...
TRANSCRIPT
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