20C - AA - STORM DRAIN MASTER PLAN

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?ter Storm Drain Master Plan Bentley /MicroStation Experience RBF is proficient with Bentley MicroStation and has utilized this software on freeway, interchange and other civil engineering design projects. We are currently using Bentley MicroStation V8i Select Series 2. And we also utilize Bentley MicroStation version V8 2004 edition for legacy or ongoing projects. RBF has utilized Bentley MicroStation while working with the following clients including: Port of Long Beach, Caltrans, Orange County Flood Control District, U.S. Army Corps of Engineers, Arizona Department of Transportation, City of San Diego, Riverside County Flood Control,Los Angeles County and Metrpolitan Water District. RBF has many of Bentley hydrology, hydraulics, and CADD programs such as Storm and Sanitary network tools, Pond Pack, Flowmaster, Storm CAD, and , f` CivilStorm. The CivilStorm hydrodyanmic model uses two types of finite K, k difference engines to solve St. Venant's equations: the EPA SWMM i engineering and an implicit engine. RBF has extensive experience running the EPA SWMM model and using it in master plans. f4 Hydraulic Analysis / Design A RBF Team members have technical competence and specialized experience in steady and un-steady single- and multi-dimensional numerical models for the s^~ hydraulic analysis and storm drain facility design. These models can analyze surface water hydrology and hydraulics in various urban environments t including coupled 1-dimensional and 2-dimensional computer models that incorporate surface and sub-surface conditions. The team has an in-depth RBF prepared 1-and 2-D surface understanding of the EPA's SWMM programs, and the experience and and subsurface model using the knowledge to identify appropriate applications for the use of the software. Midway Sw program for the ay City project. The RBF Team includes recognized experts in the application of hydrodynamic modeling. RBF's Mr. Tom Ryan recently presented an internationally attended webinar for XP Solutions on "Urban Flood Modeling using 1D, 2D, and Coupled 1D/2D models in Southern California." The webinar was viewed by over 280 participants from five different countries. For the Midway City Street and Storm Drain project, RBF developed a coupled 1- and 2-dimensional model of the existing and project conditions using the SWMM program to assess the benefits and impacts associated with the phased installation of the new storm drain system in the existing community. This analysis provided the necessary documentation to show that the phased installation of the proposed improvements would not transfer the flooding problems to the adjacent areas, and allowed the County to move forward with the phased construction of the project without expensive and complicated mitigation measures. RBF identified the existing and project condition surface flooding and used GIS tools to assess the impacts and develop - graphics to clearly document the change in surface flooding depths as a result of the project improvements. 5 RBF recently completed a study for the City of Tustin to assess drainage improvements necessary for the reuse of the former Tustin Air Base. The original master plan included offsite improvements in the adjacent city to provide the required flood protection. Right-of-way and other constraints associated with the offsite improvements would have resulted in significant schedule delays and cost millions of dollars to construction. RBF proposed a coupled 1- and 2-dimensional hydrodynamic model for the base re-use without Tustin, Hydrodynamic surface the offsite improvements to evaluate flooding limits and maximum ponding Flow Model Results for depths. The SWMM program was used for the analysis. The model evaluated maximum flooding depths the proposed on-site storm drain system and site grading. We used the results 4 20C-16