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<br />Drainage An~~is <br />Major Storm - Coal Creek <br />During a storm event of 10 year and greater magnitude <br /> <br /> <br />affecting the majority of the upstream Coal Creek Drainage Basin, <br /> <br /> <br />the Old Town section will experience significant flooding. <br /> <br /> <br />Depths up to 4' deep could be expected for areas east of the <br /> <br /> <br />bluff and north of the railroad tracks. Any storm sewer or <br /> <br /> <br />surface conveyance facilities for ~lows generated within the Old <br /> <br /> <br />Town will become submerged and rendered ineffective until <br /> <br /> <br />floodwaters from the Creek recede. The Preliminary Drainage <br /> <br /> <br />Study will address this in greater detail. <br /> <br /> <br />Minor Storm - Old Town <br /> <br /> <br />Storms in the 2 year to 5 year frequency range affecting the <br /> <br /> <br />entire Coal Creek Basin should not cause any significant Town <br /> <br /> <br />flooding from Coal Creek itself. The drainage patterns of the <br /> <br /> <br />Old Town, however, will lead to many localized problem and <br /> <br /> <br />nuisance areas during storms of this size. The preliminary storm <br /> <br /> <br />sewer alignment presented herein will help to allevia1:e many of <br /> <br /> <br />these problems areas. <br /> <br /> <br />The Town drains east and north toward Coal Creek with <br /> <br /> <br />major outfall point lying near the point where the Lower Boulder <br /> <br /> <br />Ditch crosses Coal Creek. The drainage paths within the Town are <br /> <br /> <br />poor and not well defined. In many instances J~oadways are higher <br /> <br /> <br />than adjacent lots resulting in runoff collecting in rear lot <br /> <br /> <br />areas. Dependent upon the volume of runoff these low areas could <br /> <br /> <br />easily reach depths greater than 1 foot prior to overflowing into <br /> <br /> <br />adjacent streets or lots. <br /> <br />D/2623 <br /> <br />-4- <br />