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<br />city street in a presently undeveloped area and is only required to convey <br />runoff from the 1O.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 the to-ycar stnrm will <br />overtop the street and flow directly into Cripple Creek. <br /> <br />" <br /> <br />Existing structure no. 63 is a small arch type concrete bridge on the Highway <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 andwingwalls be installed at this location. <br /> <br />9, <br /> <br />Existing structure no. 62 (56-inch culvert with 5,5 feet of headwater) is a <br />conduit installed on the main channel of Cripple Creek southeast of the <br />inteTM:ction of Warren Avenue and Third Street. This culvert has an <br />available capacity of 125 CFS, but the runoff associated with loo-yeardesign <br />storm event at this location is 1,865 CFS. It is recommended that this culvert <br />be replaced with a 10-foot high by 14-foot wide reinforced concrete box <br />culvert complete with win~,'walls, headwalls and a minimum headwater depth <br />of 13 feet. As this crossing is a driveway crossing of the channel, detailed <br />design may allow for use of a smalkr culvert along with installation of a <br />'Texas Style" driveway crm;sing. Those modificalions will be dependent on the <br />impacts of flood water on adjacent properties. <br /> <br />10. Exisling improvemenls along Third Street include culverts, inlets and storm <br />sewer piping. Exisung culvert numtlers 24. 41'1, SO and XI are accepiable. <br />Beginning in the alley bclwecn Bennctt Avcnue and Carr Avenue and <br />proceeding M)uth towan.!> Warren Avenue, the cxi~ting culverts. inlets and <br /> <br />VI.19 <br /> <br />,lorm sewer piping in Third Street are inal.lequate for reasons discussed in <br />Section C, Second Street Tributary. A new storm sewer system in the area of <br />Third Street and Bennett Avenue is recommended. This new storm sewer <br />system should consist of the following: <br /> <br />,. <br /> <br />A new 1O.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 feel of IS-inch storm sewer outfall should be installed <br />between the inlet described in a. above to Bennett Avenue. <br /> <br />c. <br /> <br />A5-foot curb opening inlet should be installed at the northwest cor ner <br />of Bennett Avenue and Third Street while a 1O.foot curb opening inlet <br />should be inslalled at the northeast corner of the intersection. <br /> <br />d, <br /> <br />From the intersection of Third Street and Bennett Avenue, a new <br />3D-inch RCP storm sewer outfall should be installed extending <br />southerly until it cros~es 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 new 5-foot curb opening inlet should be instaUed on each side of <br />Third Street immediately north of Masonic Avenue. <br /> <br />VI-20 <br />