determine condition of iowa’s natural lakes...
TRANSCRIPT
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Determine condition of Iowa’s natural lakes from pre-settlement (1850) to present
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(mean depth 9ft)
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Objectives
• Insight to changes in nutrient concentrations over time (specifically total phosphorus)
• Realistic restoration goals
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Average in filling rate of one-tenth of an inch per year
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Iowa Results
• 1900’s required more than 20 years to accumulate an inch of sediment, now only 4 years
• 70% of the sediment loading to our lakes originates from 10% of the watershed – targeted approach
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Currently 70% of sedimentation to our lakes is derived from the watershed, with remaining 30% from organics and algal production in the lake
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Summary
• Historic total phosphorus levels of 26 ppb to 147 ppb
• Current average of 161 ppb
• Trend since pre-settlement for increased rates of sedimentation, nutrient levels and decreased clarity
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limnology.eeob.iastate.edu/Publications.aspx