How does choice of thresholds affect flow regulation services at Turkey Lakes?

Measurement of water flow regulation services requires the identification of high and low thresholds that empirically define the 'Goldilocks Zone' (GLZ). The capacity of a watershed to maintain flows within this GLZ is the basis for several different metrics of water regulation in FEST. Where possible, FEST utilizes existing information on beneficiary populations to estimate these thresholds. If beneficiary populations or their preferences cannot be specified with available data, FEST estimates thresholds using statistics from the probability distribution of the flow data.

At the Turkey Lakes Watershed, long-term experimental research site in Ontario, Canada, data on beneficiary populations is absent. Thresholds are calculated based on several percentiles of the distribution for low flows (5%, 10%, 15%, 20%) and high flows (80%, 85%, 90%, 95%). Use this visualization to explore how these different high and low thresholds (in various combinations) shape the water flow regulation service over time. Catchments included are 31 (clearcut), 32 (reference), 33 (selection harvest), and 34 (shelterwood).


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