Laserfiche WebLink
W. W. WHEELER <br /> & ASSOCIATES, INC. <br /> Water Resources Engineers WWW.WWWHEELER.COM <br /> 3700 S. INCA STREET I ENGLEWOOD, CO 90 1 1 0-3405 <br /> 303-76 1-41 30 1 FAX 303-76 1-2802 <br /> TECHNICAL MEMORANDUM <br /> September 18, 2018 <br /> To: Jason Elbot, Senior Mechanical Engineer, Climax Molybdenum Company <br /> From: Steve Maly, P.E., W. W. Wheeler &Associates, Inc. <br /> Trevor E. Mugele, P.E., W.W. Wheeler &Associates, Inc. <br /> Re: 1051.00 - Climax Mine Main Entrance Access Relocation Culvert Analysis. <br /> As requested by Climax Mine, W.W.Wheeler and Associates, Inc. (Wheeler) reviewed the design <br /> of the proposed Culvert A associated with the plan to relocate the main gate entrance at the <br /> Climax Mine. As currently designed, the culvert consists of a 48-inch diameter RCP with flared <br /> end sections and a slope of 3.23%. Using the software Culvert Master by Bentley, we estimate <br /> that the maximum capacity of the culvert would be about 260 cfs with the headwater depth at one <br /> foot below the top of road fill and about 70 cfs with the headwater at the top of the RCP <br /> (approximately 4 feet depth). <br /> Wheeler also estimated the peak inflow to the culvert from the area that is tributary to the culvert <br /> inlet location. A tributary area of 10.5 acres was measured using the latest site mapping. Wheeler <br /> utilized the Rational Method along with NOAA Atlas 14 precipitation events to estimate the peak <br /> flow resulting from the 100-year rainstorm. The resulting peak flow estimate from this calculation <br /> is 61 cfs. We believe this flow rate is considerably conservative for this location and would exceed <br /> the peak flow resulting from snowmelt events. Refer to Figure 1 for a plan view of the areas and <br /> locations used for this analysis. <br /> Based on our analysis, the proposed 48-inch diameter RCP has adequate capacity for this <br /> location in this application, with a design basis that exceeds the 100-year recurrence interval <br /> rainstorm event. <br /> r:\1000\1051\1051.00\projects\newmineentrance\18sept18tm_mainentrance access relocationculvertanalysis.docx <br />