Candlewood Lake Pollution Westconn Study 2016

Current Situation

Lake is in advanced stage of decay.

Candlewood Lake Authority (CLA)

Gather Data and Trends

Fly Over Story

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Statistical Study

Of 11 possible pollution impacts studied, the #1 factor is “human activity.”

Report is available

Thesis to discuss:

With no natural streams supplying the lake and the watershed small, the predomin-ate hydraulic flow into the lake is from septic systems high in Phosphorus (P).

There are 800+ septic (Non-Point Source (NPS)) systems in the Candlewood Shores area contributing nutrients to the ground water. A high % of P discharges makes it to the lake.

  • Estimate that using average P discharge per household.
  • The approximate volume of the lake should be known.
  • The lake level and flow out of the lake should be known.
  • With this calculate the residence time and level of P by season.
  • (Some P disappears in insoluble form in the bottom.)

Question: Does the ground attenuate most of the P?  Or is the ground saturated with P, limiting the ability of the area to absorb P? Thus P into NPS systems is equal to P into the lake in this decade.

Testing Plan:

Objective: Gain insight into controversy. Are septic systems in high population areas surrounding Candlewood Lake contributing to the nutrient load? If so, at what level?

Proposed Approach: Set a plan to

  • Test soil P levels near and away from NPS water drainages.
  • Where septic systems are present, determine P gradient in soil to lake.
  • Attempt to discover if there is a P gradient in the lake.

Work by Westconn, Danbury in collaboration with Brookfield WPCA and Candlewood Lake Authority