Laserfiche WebLink
TABLE 2.05.3(3) -1 COLLECTION DITCH AND DIVERSION DITCH DESIGNS ENTIRE PERMIT AREA <br />STRUCTURE <br />WATERSHED <br />WATERSHED <br />WATERSHED <br />RUNOFF <br />DESIGN <br />TIME OF <br />PEAK <br />AVG. <br />DITCH <br />DITCH <br />VELOCITY AT <br />COMMENTS <br />BASIN(S) <br />AREA <br />% AVG. SLOPE <br />CURVE # <br />STORM FOR <br />CONC. <br />FLOW <br />DITCH <br />BOTTOM <br />DEPTH <br />DESIGN <br />(ACRES) <br />PEAK FLOW <br />(HRS) <br />(CFS) <br />SLOPE % <br />WIDTH (FT) <br />(FT) <br />FLOW <br />(YRS) <br />(FT /SEC) <br />ITCH D-1 W <br />16 <br />12.6 <br />5.19 <br />79 <br />10 <br />0.151 <br />8.41 <br />1.5 <br />3.0 <br />1.0 <br />2.9 <br />PRE -MINE DIVERSION NORTH OF POND015. <br />NEW FOR PR 2009 <br />(VERSION D- <br />18 <br />41.7 <br />6.4 <br />78 <br />10 <br />0.50 <br />10.7 <br />2.6 <br />2.0 <br />0.68 <br />4.7 <br />MOSTLY OFFSITE UNDISTURBED AREA WITH <br />08 <br />PONDING <br />(VERSION D- <br />19 <br />52.0 <br />7.5 <br />78 <br />10 <br />0.37 <br />18.2 <br />3.7 <br />6.0 <br />0.49 <br />5.3 <br />MOSTLY OFFSITE UNDISTURBED AREA WITH <br />09 <br />PONDING <br />ITCH C -281 <br />PM13C <br />0.5 <br />18.2 <br />82 <br />10 <br />0.08 <br />0.9 <br />3.6 <br />2.0 <br />0.5 <br />2.0 <br />POST MINE - COLLECTION FOR POND 013. <br />NEW FOR PR 2009 <br />ITCH C -291 <br />PM15 <br />1.5 <br />25.1 <br />82 <br />100 <br />0.16 <br />2.2 <br />5.0 <br />2.0 <br />0.6 <br />3.1 <br />POST MINE - COLLECTION FOR POND 015. <br />NEW FOR PR 2009 <br />DITCH C -301 <br />PM13B <br />7.5 <br />8.7 <br />82 <br />10 <br />0.43 <br />3.9 <br />3.0 <br />3.0 <br />0.7 <br />2.9 <br />POST MINE - COLLECTION FOR POND 013. <br />NEW FOR PR 2009 <br />DITCH C -311 <br />PM11C <br />38.7 <br />4.6 <br />82 <br />10 <br />0.57 <br />17.5 <br />2.0 <br />5.0 <br />1.2 <br />3.7 <br />POST MINE - DRAINS TO POND 011. NEW FOR <br />PR 2009 <br />ITCH C -321 <br />PM11B <br />105.1 <br />2.9 <br />82 <br />10 <br />066 <br />42.5 <br />3.4 <br />10.0 <br />1.1 <br />5.0 <br />POST MINE - DRAINS TO POND 011. NEW FOR <br />PR 2009 <br />ILDITCH C -331 <br />REPLACED WITH STRAW WATTLE SEDIMENT CONTROLS. SEE PAGE 86. <br />* The numerator and denominator in average ditch slope for C -9, C -10 and C -11 designate two distinct ditch lengths, the mild portion and the steep <br />portion. The steep portion for these ditches will be wider in the case of Ditch C -9 or lined with cobbles /shingles, as in the case with ditches C -10 <br />and C -11. Cobbles and Shingles have a manning's n of 0.035 which reduces the velocity to acceptable levels. In installation, the cobbles /shingles <br />may be substituted by durable rock of D50 of 8" size. These special ditch sections are shown on Map 2.05.3(3) -1. <br />Revised March 2014 (MR 89) Attachment 2.05.3(3) -1 -8 <br />