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<br />actual capacity could be much reduced. If the flow in the street is limited to a 6-inch depth, there <br />should not be a problem of people being "washed away" by the flow, However, if the depth is <br />allowed to increase, this may become a problem and a limitation on the flow a street may safely <br />convey will need to be considered, <br />Due to tbe large difference in the flow rate and the existing system capacity along Original Street, <br />allowing the streetto convey a greater depth of flow (and thus a greater quantity of water) will not <br />solve this area's flooding problems, An additional drainage facility should be constructed or a <br />portion of the flow will need to be diverted to another conveyance system, <br /> <br />The size of the Spring Street storm sewer upstream of Main Street is unknown so its available <br />capacity is unknown at this time. Downstream of Main Street, Table 8 shows that the drainage <br />f"cilities are undersized, passing the I a-year event but not the 50-year event. In fact, the capacity <br />of the storm sewer is probably less than the IOO-cfs listed in Table 8, Since the velocity in this <br />storm sewer at a flow of IOOcfs is very high (14.2 fps), the high hydraulic head created by this <br />velocity will prevent runoff from being able to enter the storm sewer and achieve the listed <br />capacity , <br /> <br />The Mill Street conveyance system appears to have a large amount of unused capacity, To alleviate <br />flooding problems on Original Street or Garmisch Street, flow from these areas could potentially <br />be directed to this storm sewer system. The flow capacity north of Bleeker Street would need to <br />be enlarged, The high velocity in the storm sewers will limit the actual capacity of the storm sewers <br />in Reaches G and H2' <br /> <br />The flow entering the Gannisch Street and Francis Street systems greatly exceeds the capacity of <br />these drainage facilities, Excess flow to this system may be able to be directed to the Mill Street <br />drainage system, <br /> <br />There are several possible solutions to the flooding problems in Aspen. As previously mentioned, <br />flow can be directed from systems that have their drainage capacity exceeded to those systems that <br />have underutilized capacity, New storm sewers and/or open channels could be constructed that will <br />intercept runoff from the Mountain before it enters the City and convey it to the Roaring Fork <br />River, Additional storm sewers could be constructed adjacentto the existing drainage facilities that <br />will convey flow through the City to the Roaring Fork River, and the City could allow a greater <br /> <br />7 <br />