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Red Creek Quarry Baseline Water Investigation Section 3 <br /> <br /> <br />3-12 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this docu ment. <br />3.7 Surface Water Flume Installation <br />A surface water flow monitoring station consisting of a ramp flume designed to measure flow <br />between 0.1 to 3.5 cubic feet per second (cfs) was installed in August 2022 (Photo 3-3). The location <br />of the flume was selected based on a visual reconnaissance of the stream and the proximity to the <br />surface water seeps (Figure 3-4). <br /> <br />Photo 3-3. Surface water flume after installation <br />The flume measures the volume of water by creating an obstacle in the flow path of a known <br />dimension and shape. The head of water inside the flume throat was observed using the staff gauge <br />inside the flume (Photo 3-4) and using a pressure transducer installed within the plastic stand pipe <br />attached to the flume (Photo 3-5). The transducer is located on the downstream side of the flume <br />and is not affected by water that may pond on the upstream side of the flume. A port at the bottom <br />of the flume allows water to flow into the plastic standpipe with the transducer (Photo 3-4). The <br />transducer provides continuous flow monitoring by measuring shallow water levels using a pressure <br />sensor when submerged at a fixed level under the water surface. Visual observations of the water <br />level recorded by the staff gauge inside the flume were collected periodically by Holcim and BC <br />personnel.