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as the ripped sandstone channels that they feed but will be constructed out of grouted rip <br />rap or gravel 8 " -18" in diameter for armoring. This is conservative since the transition <br />zones happen at the top of the individual drainage basins. See the Small Stormwater <br />Transition Area Channel Figure. <br />11. Peak flow calculations are included. Channel designs are included with a minimum 1 <br />foot of free board. maximum and minimum slopes are included for the ditch since it is <br />erodible but only the minimum slope is included for the channels. A individual <br />manning's n was assumed for each type of structure but only one was used since each <br />type of structure will be constructed using the consistent material. The maximum flow <br />depth is shown on each structures figure. The peak flow velocity is shown on each <br />structures figure. A spillway is not included in the sediment ponds design since they <br />hold a 100 year event. Three 24 inch culvers are going to be installed under the BLM <br />road. They will carry 68 cfs which is greater than the 46 cfs that they will see. This is <br />the equivalent of 1 foot freeboard extra capacity. <br />Please give me a call if there are any questions or additional information needed . <br />Sincerely <br />Ryan Ellis, Greg Lewic7cf and Associates <br />(303) 880 -6690 <br />