Michigan Department of Environmental Quality (MI): water quality sampling program, 1967-1997

This program is the water quality sampling program for the state of Michigan (formerly the Department of Natural Resources, then the Department of Environmental Quality). Most, if not all lakes are public and > 25 acres. The goal of the program is to determine inland lake trophic status. Spring samples are taken to determine total phosphorus and other parameter levels of the lake while it is well mixed. Summer samples were also performed for other parameters.

本项目为密歇根州水质采样项目，其原隶属于自然资源部，后划归环境质量部。该项目覆盖的湖泊绝大多数（若并非全部）均为公共湖泊，且面积大于25英亩。本项目的核心目标为判定内陆湖泊的营养状态。春季采样旨在测定湖泊充分混合状态下的总磷及其他参数水平；夏季采样则用于检测其余相关参数。