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<br /> <br />Summary Of Hydrologic Reouirements <br /> <br />The following requirements are typically accepted hydrologic requirements used in . <br />evaluation and design of whitewater courses: <br /> <br />. Course must be navigable for its entire length <br />. Course must be minimum 240 m (790 ft.) and maximum 400 m (1310 ft.) <br />. The course must consist of natural and/or artificial obstacles [to create <br />whitewater features] <br />. If the water level changes significantly during the event the competition may be <br />halted until the original water conditions are restored or the course may be <br />changed [between classes or race runs) to take into account the changed <br />conditions. <br />. The site must be able to be run a race "without annoyance or inconvenience to the <br />competitors." <br /> <br />Artificial pumped courses take their cue from the gravity flow courses, tuning their <br />flow and drop to provide a reasonable experience with strong consideration for pumping <br />costs. They are therefore the most accurate measure of a reasonable experience, <br />because the boating public must pay to participate. Presumably if the experience were <br />unacceptable attendance would fall off. The following table provides examples of . <br />existing artificial pumped courses. <br /> <br />Dickerson MD <br /> <br />Flows in Pump Circulation Courses <br />Low flow High flow <br />200 . 600 <br /> <br />210 420 <br /> <br />250 · 470 <br /> <br />Seu d'Urgel ESP <br />Penrith AUS <br /> <br />. <br /> <br />15 <br /> <br /> <br />, <br />