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Truesdale Lake Lake Management Plan. Truesdale Lake Association South Salem, NY. Truesdale Lake Evaluation. Introduction to Land-Tech Consultants, Inc. Project overview Summary of findings Questions. Project Objectives. Conduct bathymetry study Collect sediment for analysis - PowerPoint PPT Presentation
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Truesdale LakeLake Management Plan
Truesdale Lake AssociationSouth Salem, NY
Truesdale Lake Evaluation
Introduction to
Land-Tech Consultants, Inc. Project overview Summary of findings Questions
Project Objectives
Conduct bathymetry study Collect sediment for analysis Review Citizens Statewide Lake Assessment
Program (CSLAP) Findings (monitoring since 1999)
Evaluate data and provide management recommendations
Watershed
83 Acre lakeCreated in 1927
Receives water from surface runoff and primary streams
Discharges to 200 ft wide dam with spillway
2,380 Acre Watershed
Sediment
11+ feet deep 0-1.5 ft sediment
accumulated since 1956
Sediment68% Gray Sand
29% Silt
3% Gravel
Water Quality
Class B water (recreation, fishing) High phosphorous (0.018-0.084 mg/l) High chlorophyll a (37.1 ug/l) Secchi disk - average= 1.15 m Eutrophic High sediment phosphorous
Weed Control
Curly-leaf pondweed (Potmogeton crispus) Leafy pondweed (P. foliosus) Filamentous algae Nitella found in southern cove Aquathol K and copper sulfate treatments Effective control Long use of copper sulfate (45 years) – concern Recommend copper and fish monitoring
Summary Of Existing Conditions
High landscape, scenic and recreational values Managed system Sedimentation concerns High phosphorous and chlorophyll a levels Effective weed and algal control program
Recommendations
A -Shoreline Buffer Install adequate shoreline vegetative buffers of
native shrubs and grasses 15-25 foot wide buffer Slow down overland runoff Uptake of nutrients – compete for nutrients
Vegetative Buffer
Dense buffer
Recommendations
B – Aquatic buffer Introduce rooted emergents along shoreline
– Take up and compete for nutrients– Increase aesthetics– Create escape cover for fish
Typical Plants
Pickerel weed (Pontederia cordata) Bur-reed (Sparganium sp.) Three-square rush (Scirpus pugens) Common arrowhead (Sagittaria latifolia) Sweet flag (Acorus calamus) Blue flag (Iris versicolor) Soft rush (Juncus effusus)
RecommendationsC – Fertilizer Use Test soil for nutrient content Apply minimal fertilizer based on nutrient needs Water soluble – minimize use near open water and
prior to heavy rain Apply only needed amounts of phosphorous Mulch grass clippings Use organic slow release fertilizer Apply annually
Recommendations
D – Control Phosphorous Sources Maintain septic systems Discourage Canada geese use on lawns
Recommendations
E – Address “Hot Spots” #1 South end of lake – 18” discharge pipe #2 Catch basin at Truesdale Lake Drive and
Lakeshore Drive #3 Beach along eastern shoreline #4 Channel under Boway Road #5 Inlet watercourse #6 Discharge channel at western shoreline
Area #1 Relocate end of pipe
further from lake Create plunge pool Create semi-circular
forebay in lake Introduce aquatic
vegetation Provide routine
maintenance (sediment removal)
Area #2 Remove section of
pipe and replace with vegetated channel
Construct a small sediment basin and install rip rap channel to lake
Routine maintenance (sediment removal, erosion repair)
Rip Rap Swale
Sediment Basin
Area #3 Clean out & vegetate
southern channel Construct settling
basin and forebays Remove un-used pipes Riprap northern
channel, add forebay Introduce aquatic
emergent vegetation Repair eroded areas Routine maintenance
Area #4 Remove sand bars Construct multiple
sediment basins where accessible
Reconstruct channel – improve flow, protect from erosion, enhance appearance
Routine maintenance
Area #5
Open up mouth Construct crescent-
shaped forebay Deepen brook Introduce aquatic
emergents Routine maintenance
Area #6
Construct rip rap channel from pipe over steep slopes
Construct sediment basin in level area
Construct forebay in lake
Routine maintenance
Stone Filter – if needed