Laserfiche WebLink
<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Chapter IV - Formulation of Alternatives <br /> <br />Outlet Works Alternative 01 - Upstream Gate Design <br /> <br />As shown in Figure N-8, Alternative 01 consists ofa 24-inch sluice gate, which is <br /> <br /> <br />located on the upstream face of the dam. The g;:lte stem guide will be encased in oil to prevent <br /> <br /> <br />freezing. The gate will be controlled from the crest of the dam. The gate controls will be housed <br /> <br /> <br />in a concrete gate box located on the dam crest, as shown in Figure N-9. The gate controls the <br /> <br />flow into a 24-inch steel concrete encased pipe. The steel pipe will be cement mortar-lined to <br /> <br /> <br />prevent corrosion of the pipe surface. The pipe will be founded on bedrock. The pipe discharges <br /> <br />into a Type VI USBR impact basin. <br /> <br />Outlet Works Alternative 02 - Gate Chamber Design <br /> <br />Figure N-I0 shows that the Alternative 02 consists of an internal6-foot by 6-foot <br /> <br /> <br />concrete gate chamber with two 24-inch sluice gates; one mounted upstream (emergency gate) <br /> <br /> <br />and one mounted downstream (control gate) in tfle gate chamber. The outlet pipe consists ofa <br /> <br />24-inch mortar-lined steel pipe encased in concr$te. The intake section of the outlet pipe <br /> <br /> <br />(upstream of the gate chamber) will be pressurized, while the outlet section of the outlet pipe <br /> <br /> <br />(downstream of the gate chamber) will not be pr$ssurized, once the control gate is closed. A <br /> <br /> <br />control house will be constructed on top of the d<lm to protect the operators and to gain access to <br /> <br />gates. The outlet pipe will be founded on bedroc\C. The pipe discharges into a Type VI USBR <br /> <br /> <br />impact basin. <br /> <br />Outlet Works Alternative 03 - Gate Tower Design <br /> <br />Figure N-ll shows that Alternative 03 i~ a variation of Alternative 02. The 6-foot by 6- <br /> <br /> <br />foot concrete gate chamber, with two 24-inch sluice gates, would be located upstream of the dam <br /> <br /> <br />embankment instead internally to the embankmerlt. The gate chamber would then become a gate <br /> <br /> <br />tower. A bridge would gain access to the control house from the dam crest. The outlet pipe <br /> <br />would consist of a 24-inch mortar-lined steel pipe encased in concrete, founded on bedrock. The <br /> <br /> <br />outlet pipe would then discharge into a Type VI USBR impact basin. <br /> <br />Monument Lake Dam Feasibility Study <br /> <br />28 <br /> <br />BOVLE <br />