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SECTION VI school amI the football fieldjtrack. The flow cuntinue, in a channel in a southerly direction to West Avenue where it turn, and flo....'S westerly to a crossing of B Street. At this point, the channel again turns to a ,outherly Jirection with crossings of Golden Avenue and Eaton Avenue. At a point north of Carr Avenue, the channel turn.'; ill a southwesterly direction with crossings of Teller County One and Bennell Avenue. After crossing Bennett Avenue, the channel flows in a westerly dircction to an intersection with a tributary channel which follows Teller County One from west to cast. At this intersection. the channel then flows in a southerly direction through the undeveloped southwest portion of the city anJ out of me corporate limits. ORAI;'\o'AGE STRUCTURE J~PROVEMENTS This section presents a discussion of specific drainage structure conditions and offers recommended solutions to correct inadequacies. Preliminary cost estimates have been prepared based on the recommended solutions and are presentcd in Section VII uf tlJis master plan. The location and alignment of the proposed improvements is shown schematically on Exhibit No.2, "Drainage Structures; and Exhibit No.3, "Bennett Avenue Storm Sewer System." Results of a field inventory of existing drainage structures is included in Appendix C of this report. Details of existing drainage structures are summarized in Table 5 in Appendix B, " Existing Drainage Structure Evaluation." Table No.5 provides information on structure size. material,availableheadwater, ent rancecondition,capacity, required capacity and adequacy. Tahlc 6 in Appendil; B, "Recommended Drainage StruClllrc Improvements' provides a summary of all drainage infrastrueture improvements recommenJcd by this master plan. Master planning is a dynamic process anJ is not intended to, 'ca,t recommended improvements in stone," but rather provide guidelines unJer which future impruvements shuuld be made. Variations in proposeJ lanJ use and development may occur which will require revisions or modifications to me proposals contained herein. The recommenJed improvements to storm water drainage facilities contained in this report shoulJ he reviewed anJ their required hydraulic capacities. grades, sizcs and alignments should he verified during the preliminary design phase for each individual improvemcmprojecl. The existing channels are typically in an undeveloped condition, ar e unstable and of inudequatesize to convey runoff from the tOO-year designstonn. El;istingculverts at the various street crossings are severely undersized anJ in mun yinstancesinvery poor condition. Inadditiontostructuresalongthemainchannel,numeroussmaller culverts exist whieh convey flow from smaller subbasins within the watershed to the main channel of Pony Gulch. In mo,t instances. these culverts are of adequate size. but in some ca<;es in need of repair or cleaning. Storm wmer rUlloff from the Pony Gukh watersh"..! Clllers the dty's ~,)[p()ratc limits through a clearly defined channel north of the Cripple Crt'ekjVictor School. The flow ..:ontinues southcrly crossing Galena Avenue and follows a channel hetween the Design storm runoff in Pony Gulch for the 1O.year design ~torm varies from 167 CFS at the northerly corporate limits to 303 CFS at the southerly corporate limits. Design storm runoff from the I()()...year design ,torm varies from 65R CFS to 1157 CFS ilt the northerly and southerly corporate limits respectively. In accordance with the guidelines of this Drainage Master Plan and considering that any flows which overtop the existing Pony Gulch channel pre,ent severe flooJing problem,. the major slfLIctures along Pouy Gulch shall be designed to auequately convey the lOO-year de,ign storm fLInoff. The following improvements arc recommended to drainage structure~ of thc Pony Gulch watcr~hed which lie within the c<Jrporatc limits of Cripple Creek, l\. l'o!lyGulch VI-l VI-2