本演示介绍了塞巴戈湖流域，该流域是缅因州波特兰市的饮用水源。该湖流域保护的历史是一分为二的，并确定了当前流域保护计划的各种要素。最后，总结了流域保护的经济效益和环境效益。包括数字。

This presentation describes the Sebago Lake watershed, the source of drinkingwater for Portland, Maine. The history of watershed protection at the lake isoutlined and the various elements of the current watershed protection program areidentified. Finally, the benefits, both financial and environmental, of watershedprotection are summarized. Includes figures.