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<br />dty street in a presently undcveloped area and is only required to convey <br />runoff from the lO-year design storm (41 CFS). It is recommended that this <br />culvert be replaced with a 36-inch CMP culvert with a minimum headwater <br />depth of 4 feet. Runoff in excess of that generated by thc lQ-year stnrm will <br />overtop the street and flow directly into Cripple Creek. <br /> <br />,. <br /> <br />Existing structurc no. 63 is a small arch type concrete bridge on the Higbway <br />67 crossing of the main channel of Cripple Creek. This bridge has a capacity <br />of approximately 400 CFS, but runoff from the loo-year design storm event <br />at this location is 1,920 CFS. Approximately 17 feet of headwater is available <br />at this location. Based on available headwater, it is recommended that a 10- <br />foot high by 12-foot wide reinforced concrete box culvert complete with <br />headwalls andwingwalIs be installed at this location. <br /> <br />9. <br /> <br />Existing structure no. 62 (56-inch culvcrt with 5.5 feet of headwater) is a <br />conduit installed on the main channel of Cripplc Creek southeast of the <br />intefM:ction of Warren Avenue and Third Street. Thi, culvert has an <br />available capacity of 125 CFS, hut the runoff associated with loo-ycardesign <br />storm event at this location is 1,865 CFS. It is recommended that this culvert <br />bc replaced with a 10-foot high by 14-foot wide reinforced concrete box <br />culvert complcte with win~,'walls, headwalls and a minimum headwater depth <br />of 13 feet. As this crossing is a driveway crossing of thc channel, detailed <br />design may allow for use of a smalkr culvert along with installation of a <br />'Tcxas Style" driveway crossing. Those modifications will be dependent on the <br />impacts of flood water on adjacent properties. <br /> <br />10. Existing improvements along Third Street include culverts, inlets and storm <br />sewer piping. Exis\lng culvert numtlers 24. 41'1, SO and.'\l are accepiable. <br />Beginning in the alley hclwecn Bennett Avcnuc and Carr Avenue and <br />proceeding Mluth towanJs Warren Avenue, thc existing culverts. inlets and <br /> <br />\11-19 <br /> <br />storm sewer piping in Third Street are inadequate for reasons discussed in <br />Section C, Second Street Trihutary. A new storm sewer system in the area of <br />Third Street and Bennett Avenue is recommended. This new storm sewer <br />system should eonsist of the following: <br /> <br />,. <br /> <br />A new to-foot curb opening inlet placed at the outlet of culvert <br />numbers 80 and 81 on the east side of Third Street between Bennett <br />Avenue and Carr Avenue. <br /> <br />b. <br /> <br />100 lineal feet of 1S-ineh storm sewer outfall should be installed <br />between the inletdeseribed in a. above to Bennett Avenue. <br /> <br />,. <br /> <br />A5-foot curb opening inlet should be installed at the northwest corn er <br />of Bennett Avenue and Third Street while a 1O.foot curb opcning inlet <br />should be installed at the nortl1east corner of the intersection. <br /> <br />d. <br /> <br />From the inter~ecti()n of Third Street and Bennett Avenue. a new <br />30-inch RCP storm sewer outfall should be installed extending <br />southerly until it crosses Warren Avenue and discharges into the <br />existing channel. Approximately 700 lineal feet of 30-inch RCP outfall <br />will be required. <br /> <br />,. <br /> <br />A ncw 5-foot curb opening inlet should be instaUed on each side of <br />Third Street immcdiately north of Masonic Avenue. <br /> <br />VI-20 <br />