Estimated monthly flows and exports of total nitrogen and phosphorus from Lake Simcoe at Atherley

Abstract

Atherley is a small community which lies between Lake Simcoe to the south and Lake Couchiching to the north. Water flows from Lake Simcoe to Lake Couchiching through a narrows adjacent to the Community of Atherley. Cumming Cockburn Limited was commissioned by the Ministry of the Environment to undertake an hydrologic analysis to estimate the outflows from Lake Simcoe at Atherley. The flow estimates were to be derived utilizing monthly time steps in the analyses, and were to be summarized as monthly averages for the period 1986 to 1990 inclusive. The monthly export of nitrogen and phosphorus were also estimated for the period from 1983 to 1990.