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January /996 TR-65 Rtprap Evaluation • Hayden Gulth Mine Permit No. G80-003 ~ 2 <br />TABLE 1 <br />WESTERN D17CN FLOW CHARACTERISTICS <br />Ditch <br />Reech Bottom Stope <br />(ft/ftl Mapping's <br />Roughness <br />Coefficient Design <br />Discharge (cfsl Flow Depth <br />(ftl Flow Velocity <br />(fps) <br />Riprap D~ = 6 inches ~ <br />WD-4a 0.11 0.043 2.43 0.10 2.39 <br />WD-4b 0.038 0.036 2.43 0.12 1.93 <br />Riprap D~ = 3 inches <br />WD-4a 0.11 0.038 2.43 0.09 2.58 <br />WD-4b 0.038 0.032 2.43 0.11 2.07 <br />Riprap D,o = 1 inch <br />WD-4a 0.11 0.032 2.43 0.08 2.87 <br />WD-4b 0.038 0.027 2.43 0.10 2.30 <br />Riprap Dzo = 1 inch and channel vegetated <br />WD-4a 0.11 0.07 2.43 0.13 1.77 <br />WD-4b 0.038 0.055 2.43 0.16 1.48 <br />Pond HG8 Emergency Spillway <br />Visual inspection during 1995 of the emergency spillway riprap resulted in an estimated average <br />Dso of roughly nine inches, which is consistent with design specifiptions approved by the <br />Division. There have been no known occurrences of flow through the emergency spillway and <br />the riprap does not show signs of weathering due to climatic processes. The riprap used in the <br />spillway appears to be a more durable material than some of the riprap used in other drainage <br />structures. Therefore, the existing riprap as constructed should provide adequate protection for <br />the pond emergency spillway. <br />TenaManis lnc. " P.O. Box 774018 "Steamboat Sprirsgs, Colorado 80477 " (970J 879-6260 <br />