FLOOD00310 - Laserfiche WebLink

Home Browse Search

.r,.. _-::. , union Avenue Boat Chute Alternatives Two alternatives identified by the consultant and two requested by the informal technical committee (CNCB. State Engineer. Urban Drainage) offer a range of approaches to improving boating safety and the boating experience on the South Platte River. All of the alternatives have some characteristics in common: All are outside the existing Union Avenue weir. All are on the west bank. All have water flow only when the river flow exceeds 100 cfs. the amount needed to meet the City of Englewood's water supply call. All designs are functional over a range of 100 to 500 cfs in the chute. Over the past 15 years of record. water flow was adequate for boating from May through August 50 to 60 percent of the time. Flows over 1.500 cfs are considered too high for safe boating on the river. Alternative 4: This design consists of a straight forward drop and pool approach using 7 drops of about 2 feet each. The chute design uses structural concrete and grouted rock adjacent to the existing retaining wall. Cost = $1.253 M Alternative 5: The overall length of this alternative is 2.600 feet. contrasted with 750 feet for alternative 4. This approach would essentially reconstruct the original river channel and connect with a remaining oxbow for reentry to the river. It would have a landscaped natural appearance. It would also expand upon boating use by providing kayaking practice pools. a competition course. and water quality improvement in the existing .tagnant oxbow. It would require purchase of additional property. Cost = $1.209 M Alternative 4A: This alternative uses some features of both of the previous approaches. It uses that landscaped concept of alternative 5. but has the earlier reentry to the river used in alternative 4. Future expansion into the oxbow is retained. The boating gradients in the structure are somewhat steeper than in previous alternatives. Cost = 1.152 M 5052E