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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />HYDROLOGY AND WATER QUALITY <br />Local Surface Waters and Drainage <br />The majority of the project area is developed, with only a few vacant lots remaining. The project area consists <br />of predominantly impervious areas, with a few unpaved back lots where cars are stored. The existing runoff <br />coefficient for the project area was calculated to be approximately 70 percent (IBI 2013). <br />As noted in the drainage study prepared by IBI, it is assumed that the lots in the project area surface -drain to <br />Harbor Boulevard and other side streets, and the runoff is captured and conveyed in the storm drain systems. <br />Runoff is managed by a combination of closed and open drainage channels. A 90 -inch culvert crosses <br />Harbor Boulevard at Washington Street. A second large closed drainage system is midway between fast and <br />fifth Streets. All drainage ultimately discharges into the Orange County Flood Control Cbannel (sce Appendix <br />F). <br />Boyle Engineering prepared a Drainage Engineering Report m 1993 for the entire City of Santa Ana. The <br />results of the report for the existing drainage system in the project area are provided in Table 5.7 -1. The <br />existing drainage system in the project area is shown in the detailed drainage maps contained in the drainage <br />study prepared by IBI (sce Appendix F). As shown in the table, many of the drainage pipes in the project area <br />are currently deficient. A storm drain project was completed along Harbor Boulevard in 1996. Many of the <br />deficiencies shown in the 1993 Boyle Report and summarized in Table 5.7 -1 were remedied with the 1996 <br />storm drain project (IBI 2013). <br />Table 5.7 -1 Existing Proiect Area Drainage Svstem and <br />Pipe ID Ez Diam. Roadway Pipe Total <br />Location Node teD Node (inches) Runoff, (cfs) (cfs) (cfs) (cfs) I Deficiency (cfs) <br />17th Street to 5th Street <br />Northeast from south end of Harper <br />St <br />0302 -0303 <br />- <br />13.3 <br />0 <br />0 <br />0.0 <br />-13.3 <br />Harbor Boulevard from 17th St to <br />Washington Ave <br />0325 -0326 <br />- <br />26.4 <br />2.3 <br />39.6 <br />41.9 <br />0.0 <br />0326 -0327 <br />- <br />26.4 <br />29.2 <br />39.6 <br />68.8 <br />0.0 <br />0327 -0328 <br />- <br />26.4 <br />29.2 <br />39.6 <br />68.8 <br />0.0 <br />17th St From Seaboard Cir to East <br />Garden Grove - Wintersburg <br />Channel <br />0330 -0377 <br />- <br />17.5 <br />6.6 <br />0 <br />6.6 <br />-10.9 <br />Near intersection of Harbor Blvd /1st <br />St <br />0406 -0407 <br />- <br />15.2 <br />12.5 <br />0 <br />12.5 <br />-2.7 <br />0407 -0408 <br />36 <br />15.2 <br />12.5 <br />21.3 <br />33.8 <br />0.0 <br />0426 -0427 <br />- <br />20.7 <br />12.5 <br />0 <br />12.5 <br />-8.2 <br />0427 -0428 <br />- <br />20.7 <br />12.5 <br />0 <br />12.5 <br />-8.2 <br />0428 -0408 <br />- <br />28.2 <br />12.5 <br />0 <br />12.5 <br />-15.7 <br />0408 -0409 <br />48 <br />54.0 <br />12.5 <br />87.6 <br />100.1 <br />0.0 <br />Harbor Blvd south of 1st St <br />0581 -0582 <br />- <br />15.6 <br />12.5 <br />0 <br />12.5 <br />-3.1 <br />West of Harbor Blvd just north of <br />Camile St <br />0582 -0586 <br />TxF <br />309.2 <br />0 <br />1128.3 <br />1128.3 <br />0.0 <br />Harbor Blvd north of McFadden <br />Ave <br />0571 -0572 <br />- <br />18.3 <br />12.5 <br />0 <br />12.5 <br />-5.8 <br />0572 -0573 <br />- <br />18.3 <br />12.5 <br />0 <br />12.5 <br />-5.8 <br />October 2014 Page 5.7 -9 <br />