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3 <br /> 2) This ptule shall not apply uhere it can be <br /> demonstrated that stor :safer discharcc;e velocities .gill not <br /> i x eate an erosion pro slew :i.n. the recc wins,, watercourse. <br /> 3) The followicig is a, table for maxiMURI pern ssible ve:LocitY <br /> for stormwater discharges: <br /> M,rrcimttm Permissible <br /> 1fateria-1 Velocities For <br /> ine Sand (roncolloidal) 2.5 _g <br /> Sandy Loam (noncol..loidal) 2.S .8 <br /> Silt Loam (noncolloidal) 3.0 .9 <br /> Prdi.nary Firm Loam <br /> 3.5 1.1 <br /> ine Gravel 5.0 1_5 <br /> ti f Cr_ ;:-ery colloidal) 5.0 1-5 <br /> raged, Ua_= to Cobbles (:toncolloidal) 5.0 1..5 <br /> raded, Silt. to Cobbles (colloidal) 5.5 107 <br /> l.luvial Silts (noncolloidar) . 3.5 1.1 <br /> Alluvial Silts-(colloidal) 5.0 1.5 <br /> oarse Gravel (n.on.colloidal) 6.0 1.8 <br /> obbl es and Shingles 5.5. 1.7 <br /> shales and Hard Pans 6.0 I-S <br /> Source. Adapted from recommendations by Special Committee on <br /> Irrigation Research, American Society of Cavil Engineers, <br /> 1926, for channels Frith straight ali.gnement. Ib,'si"rluous <br /> channels multiply allowable velocity by 0.95 for slightly <br /> sinuous, by 0.9 for moderately sinuous channels, and by <br /> w 0.8 for highly sinuous channels. <br /> Section 13 add on to end of last sentence in section: <br /> . . . except facilities and measures installed within road or <br /> str et right of -caay or easements accepted for maintenanc.e by <br /> a governmental agency. <br /> Section 15 <br /> a. Lia 3 change "one cantiguotas acre" to: <br /> "201000 contiguous square feet" <br /> Section 17 <br /> a. <br /> Delete subsection and substitute: <br /> No erson shall undertake any land disturbing -gctivity which <br /> wound result in the uncovering of 20,000 square feet or more with- <br /> out first obtaining a permit therefore from the Erosion Control. <br /> Off Fer, except that no permit shall be required for the land <br /> disturbing activities listed in Section 5. The permit shall be <br /> iwss I ed only after sub-mission and approval of an erosion and sedi-- <br /> mena.tion control. plan, except that no plan shall be required <br /> whe e the area to be uncovered is less than 40,000 sq. ft. Vhare <br /> a parnit is required, but no plan is required, a plan exemption <br /> foul shall be obtained. Erosion control neasures specified on <br /> th plan e-enption form shall be implemented and maintained <br />