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<br />. <br /> <br />. <br /> <br />. <br /> <br />runoff that flowed into it from the higher ground to the north, This system did not seem <br />to cause any major problems until recent years when street paving projects, curb and <br />gutter projects, and development on the north side of the city decreased infiltration and <br />increased storm water runoff. A new conveyance system is needed to handle the <br />stormwater runoff and to prevent flooding problems along the Holita Ditch, <br /> <br />V. DATA COLLECTION <br /> <br />On October 24, 1995, the CWCB completed a field visit to the City of Walsenburg to <br />meet with local officials and to gather information and field data pertinent to the project. <br />In addition, field investigations were performed by the Colorado School of Mines project <br />team on February 18, 1996. <br /> <br />VI, AL TERNA TIVE PROJECT PLANS <br /> <br />Two methods of providing flood conveyance downstream of the storm drain outfall at <br />Holita Ditch were investigated, They are as follows: <br /> <br />I. Ditch capacity expansion: Augment the existing capacity of the Holita <br />Ditch along the reach between the storm drain outfall (Russell Avenue) <br />and the culvert at Interstate 25. This would involve excavating a larger <br />channel cross-section and providing a levee along the south bank of the <br />ditch. This work would require that the ditch owners cooperate with the <br />City and allow the ditch to continue to carry stormwater runoff from the <br />storm drain. In addition, this alternative would require the removal of <br />numerous trees and shrubs along the project reach, <br /> <br />2, New storm sewer from the existing storm drain outfall to the <br />Cucharas River: Construct storm sewer pipeline along Russell A venue <br />from the existing storm drain outlet downstream to the Cucharas River. <br />This alternative would also require crossing the railroad tracks south of <br />Colorado Avenue, This alternative could also conflict with existing <br />underground utility lines that may have to be relocated, <br /> <br />The two alternatives were developed based on the criteria of mitigation benefits, <br />construction methods and costs, and project feasibility, The plan sheet and typical detail <br />sheets for the two alternatives are presented on plates 1 through 3, <br /> <br />5 <br />