C150163 Feasibility Study - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I addition, over the 6 year study period the average annual excess delivered downstream of Turnout 31 ranged from approximately 900 ac-ft to approximately 3500 ac-ft with an average of approximately 2000 ac-ft downstream of Turnout 31. These excesses were due to operational inefficiencies, and inaccuracies. The shortages during peak demands can be mitigated by the use of an equalizer reservoir. The operational study showed that a 453 ac-ft reservoir would have been necessary to overcome all of the shortages experienced during the study period, but that a 91 ac-ft reservoir would have provided sufficient additional water to meet the peak demand in five out of the six years during the study period. In addition, with an equalizer reservoir, the operational difficulties that caused the excess deliveries downstream of Turnout 31 could have been minimized resulting in efficiency improvements ranging from 900 to 3500 ac-ft per year. Based on the results of the study, the NCLPIC decided to proceed with plans to construct an equalizer reservoir. A 300 ac-ft reservoir was selected for the Barnesville Equalizer due to physical constraints at the site. Groundwater Augmentation Plan Currently, several NCLPIC shareholders pump from groundwater supplies to irrigate their land. In addition, many wells formerly covered under GASP no longer have groundwater augmentation plans. Without augmentation plans, it will be illegal for these users to operate their wells. HRS Water Consultants, Inc. is currently developing a groundwater augmentation plan for NCLPIC shareholders and other subscribing well users in the area. The plan should be completed and submitted to Water Court by the end of December 2003. Subsequently, a short-term substitute plan can be utilized to allow well users to continue operating their wells while the long-term plan is reviewed by the Water Court. Drury Reservoir, Cornish Plains Reservoir, and Barnesville Equalizer will be included in the augmentation plan. Outlet Works Drury Reservoir Drury Reservoir requires a 30-inch diameter outlet pipe to meet the State Engineer's requirement of lowering the reservoir five feet from full capacity in five days. The outlet pipe will be configured to direct flow into either an energy dissipation structure or into the pipeline. The flow will be controlled with gate valves near the end of the outlet pipe. The outlet pipe will have a sluice gate on the upstream end. In order to facilitate connection to the pipeline and control valves, a concrete-encased ductile iron pipe is recommended. Ductile iron pipe is a pressure pipe and can therefore be used as a gravity flow outlet and as a pressurized inlet. New Cache Feasibility Study 24