Laserfiche WebLink
• TABLE 2.05.3(3)-11-1 <br />THE DESIGN PARAMETERS OF POND 014 ARE AS FOLLOWS: <br />Watershed Area (Acres) 2.1AC <br />Curve Number 79 <br />100 Year 24 Hour Event Inches (NOAA) 3.0 <br />Volume (Acre Feet) 0.21 <br />Peak Discharge in (CFS) 2.76 <br />Peak Discharge Out (CFS) 0.0 <br />Sediment trap Efficiency NA <br />Peak Stage NA <br />Primary Spillway Elevation NONE <br />Emergency Spillway Elevation NONE <br />• <br />As stated in Section 2.05.3(3) Mine Facilities, "Pond 014 is the post-mine conversion of the <br />pre-mine SAE #2. The drainage area is 4.4 acres, but a contour ditch that drains to Pond 009 <br />crosses the Pond014 drainage and reduces the effective drainage for sediment control <br />purposes to 2.1 acres. The contour ditch dimensions will be about two feet wide at bottom <br />and the downslope side will be about two feet high with a 2:1 slope. The contour ditch is to <br />remain as a permanent part of the reclamation landscape. Pond 014 will be removed after <br />reclamation is approved. The pond details are shown on Map 2.05.3(3)-11. <br />Pond 014 excavation has been designed to contain the 100-year 24-hour event with no <br />discharge. Due to its small drainage area and completely incised impoundment, there is no <br />embankment to fail and so only run-off volume calculations have been performed. <br />Pond 014 was approved in TR-51. <br />• <br />Revised July 2006 Attachment 2.05.3(3)-11-2 <br />