It's been almost ten years since I moved to the Chicago area, and I'm still trying to grasp the "natural and unnatural" history of its geography and waterways. Dick Lanyon's books - along with those by Libby Hill about the Chicago River - are essential reading for anyone who wants to understand how this landscape has been altered in the years since Europeans arrived. Mr. Lanyon, an engineer, was head of the Metropolitan Water Reclamation District for many years and has an unmatched grasp of the chronology of what's been called one of the world's major engineering feats -- designed with the shifting and expanding purposes of disposing of sewage, protecting clean water, and managing stormwater. This book focuses on the northern part of the system, including the North Shore Channel that runs through Evanston to the Wilmette harbor and Lake Michigan. It is richly illustrated with archival images. Local groups are working to bring natural habitat back to areas bordering the channel - an "unnatural" creation but the most extensive green corridor remaining in this area - and this book provides context. It also inspires admiration for the engineering feats (and political skill) that keep our basements from flooding (most of the time), turn waste into compost, and provide us with drinkable water. It's a timely reminder that we can't take these basic needs for granted.