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High Line Canal
The High Line Canal (HLC) is a man-made waterway, used for irrigation and recreation, that serves the Denver-Aurora Metropolitan Area. It begins at a diversion dam on the South Platte River, some above the mouth of Waterton Canyon. From its headgate, the HLC runs to Green Valley Ranch, passing through Douglas, Arapahoe, and Denver Counties.〔(Denver Water: High Line Canal ), accessed 09/23/2011.〕
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==Origin of the name==
The High Line Canal is not the only one so named. Others in Colorado include the Farmer’s High Line (which flows from Golden passing through Westminster and Thornton); the Government High Line (which irrigates Grand Junction and the surrounding Grand Valley); and the Rocky Ford High Line (which irrigates land in the Arkansas River Valley around Boone, Fowler, Manzanola, and Rocky Ford). Elsewhere in Colorado and in other western states, there are a number of additional canals named "High Line" or "Highline".〔(U.S. Board on Geographic Names ), accessed 10/24/2011.〕
High Line canals are named after the engineering principle by which they are designed.〔High Line Canal: Meandering Through Time. A Historical Trail Guide. By Dr. David Skari. Copyright 2003 David Skari. Printed by C&M Press, 4825 Nome St. Denver, Colorado 80239.〕 The "high line principle" calls for a canal to follow the contours of the terrain, with a minimal drop in elevation per mile along its course. Thus the canal follows the line of highest possible elevation that allows its flow to be driven by gravity (so that neither pumping nor electricity is required for transporting the water). As a result, High Line canals typically have many twists and turns as they maintain elevation by traversing natural valleys first in an upstream direction, then back down the opposite side, then around dividing ridges, and so on.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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