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Feasibilitc Shide <br />Farmers' High Line Canal and Reservoir Company <br />October 2010 <br />reshape the ogee shaped crest. The dain would need to be cleaned of any loose debris, additional <br />steel would need to be added where the exposed steel is damaged, new steel mats installed, and then <br />concrete would be poured in-place. As part of the design phase, the dam's ogee crest shape would <br />be designed for the maximtun creek discharge to provide the most efficient discharge over the dam <br />and reduce downstream riprap revetment. <br />Control Svstems <br />To modernize the control systems on the canal a SCADA control system is also recoinmended to be <br />installed. The installation of a SCADA would provide FHL Canal staff with the ability to reinotely <br />read flows at the 15-foot Parshall flume and operate the canal gates to adjust the diversion rate into <br />the canal. The system will be able to open and close the 3 slide gates proposed at the river gate <br />structure and the 2 slide gates proposed for the headgate structure. There are a total of 5 existing <br />gates at the control gate stn�cture, 2 have recently been modified with new pedestals and hand <br />operators. These 2 gates will be equipped with new actuators so that they can be controlled by tlus <br />systen�. The last gate is the existing slide gate oi7 the overflow channel. This gate is already <br />equipped with the proper actuator, but will require an upgrade to accept the signal that will control <br />the gate with this system. There will also be level control sensors located at the headgate structure, <br />the control gate structure, and at the 15-foot Parshall flume. <br />Preliminary repair plans for the headworks can be found in Appendix B-2. <br />Van Bibber Siphon <br />This stn�cture has significant damage including surface erosion which has extended well beyond the <br />original concrete surface compromising structural coinponents. Structural displacement, <br />movement, or collapse was not observed despite the significant erosive damage. We did not <br />observe a significant amount of soil loss or settlement around the stn�cture. The integrity of the <br />structure is anticipated to continue to degrade, and if the erosion of the concrete surfaces is allowed <br />to continue uncheciced the structural degradation will lilcely accelerate. It may be possible to extend <br />the life of the existing structure by instituting repairs in the near future. <br />Recominended repair actions include: <br />■ Removal of woody vegetation around the stn�cture <br />■ Excavation along the outside of the concrete box culvert to expose areas of observed <br />seepage <br />■ liistallation of sealant along outside of wall in areas of seepage (tlus may include injection of <br />epoxy grout) <br />■ Clea�ling of areas with surface damage. <br />■ I�IStallation of steel dowels to supplement existing corroded steel. <br />■ lilstallation of cemei7tatious patch primer. <br />■ liistallation of lugh strength shotcrete or hand trowelled patch material. <br />Figures illustrating the damage to the existing stnicture are presented in Appendix B-3. <br />-11- <br />