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31 <br />Civic Center Starmwoterl t(iStation Renovotion Design Services <br />entire storm drain was completed in May 1994. Michael Baker analyzed the city's main line <br />drainage system to ensure consistency with Orange County requirements and prepared a <br />hydrology study for the entire 28- square miles drainage area. The hydrology was divided into <br />seven sub -watersheds, each draining to County regional flood control facilities. The 10-, 25-, and <br />100 -year discharges were calculated in accordance with Orange County Hydrology Manual <br />(OCHM). Small Area hydrographs were prepared for each inlet catch basin location for use in the <br />hydraulic routing analysis. Existing inlet capacity was evaluated and rating curves for the captured <br />flow (to the storm drain) were developed. <br />The capacity of the existing storm drainage was evaluated based on the Orange County design <br />criteria to determine system capacity sufficiency utilizing a hydrodynamic hydraulic model. A <br />comprehensive list of needed storm drainage improvements was then generated. Michael Baker <br />performed a 1 D/2D hydraulic analysis to evaluate existing facilities and recommend feasible <br />ultimate storm drain sizes based on the hydrology study results. The existing condition results <br />were correlated using pictures and maintenance records of known flooded locations and recent <br />January 2017 storms. The hydraulic analysis also evaluated the tallwater for tie-in location at the <br />existing County regional drainage systems, HEC -RAS was performed for these regional channels <br />using design discharges from As-Bullts or FEMA studies. <br />Michael Baker also provided an Esri ArcGIS geodatabase of city storm drain facilities, including <br />storm drain pipes, city -owned drainage channels, manholes, catch basins, and culverts. The <br />results of the 1 D/2D hydrodynamic model generally result in smaller pipe sizing than traditional <br />steady state or normal depth models. This results in a costs savings for the city. <br />a'VN mccn . klCUCJ2RP.W,wX„ x r wY suVt 4 dr�A4i �,.�ri' +S;ti? s , ItW'edhtin:�tl . SA' _Lr.Mbdi.Ndu' uu,v^5 fi+ I� M',* ;# g ,h ,. , -.^.•;.:t <br />North Bank Lift Station Upgrades ( San Buenaventura, !CA. <br />Client: City of San Buenaventura, 501 Poli Street, Ventura, CA 93002 <br />Reference: Ms. Betsy Cooper, Senior Civil Engineer (805) 654-7848, ecoo er \7 ,r ti.irawater.ngt <br />Year. 2018 <br />Teams Members Involved: Karl Meier (Project Manager), Marek Przywara (Electrical Engineer) <br />Michael Baker performed detailed hydraulic analyses of the lift <br />station and force main to establish a baseline for the actual <br />hydraulic capacity of the sewage conveyance system and identified <br />deficiencies and capacity limitations. Michael Baker also analyzed <br />the existing NBLS and force main under projected peak flows to <br />determine the extent of upgrades required to convey future peak <br />flows. The existing electrical and control system were also <br />evaluated with recommended upgrades identified. As a part of this <br />project, Michael Baker also met with City Engineering and <br />Operations staff to discuss existing operation and maintenance <br />issues at this 3,200 gpm dry/wet-pit lift station to ensure that these <br />issues would be addressed as a part of the overall upgrade project. <br />Michael Baker developed a comprehensive PDR that considered <br />four upgrade alternatives and corresponding cost estimates to <br />Ifl YkXd M1TIUXAL 12 <br />