A&P Consulting - Laserfiche WebLink

Home Browse Search

A&P CONSULTING TRANSPORTATION ENGINEERS, CORP. GOLDEN SHORES PUMP STATION REHABILITATION (CCNA) RFQ 18-11-01 13 Selection of Best Alternative In order to evaluate all proposed alternatives and their respective advantages and disadvantages in fair fashion, it is necessary to develop a scoring system that assigns a value to each of the many parameters. APCTE has developed a scoring matrix that will assist on the selection of the best alternative. Below is a preliminary version of that Matrix, which will be modified during the actual design phase of this project. Rehabilitation of other elements of the Drainage System Although the City of Sunny Isles Beach boasts an existing drainage system with the capacity required for the neighborhood it services, APCTE’s goal is to provide the most up-to-date and improved pump station that will cost-effectively endure for many more years to come. In order to do so, it is critical that the existing system be thoroughly analyzed and accurately assessed to evaluate their hydraulic and structural condition. The existing drainage wells and pipes should then be cleaned after which any necessary developments or rehabilitation can be undertaken for a complete and satisfactory new pump station. The existing drainage system serving the Golden Shores Neighborhood is based on swales with catch basins located at several locations that collects runoff generated by roads and adjacent properties. It is observed that some of the existing inlets were recently replaced and upsized. These drainage structures are connected to a storm sewer transmission system, which ultimately discharges into the existing Stormwater Pumping Station. Drainage Pipes The existing system, mainly the pipes and drainage wells, must be inspected in order to acquire a sense of their current condition and what, if any, rehabilitation must be done. While there are certain structures and sections of the drainage that can be inspected visually, the most cost-effective and efficient method is to use a CCTV system that can record depth and physical location of any defects or obstructions that may be encountered. The CCTV System consist of PIG (pipeline inspection gauge) with a camera and high-powered lights on a swiveling head connected to display equipment via long cable wound upon a winch that traverses the pipeline. Displaying in real-time what is encountered within the pipeline, it simultaneously records to an external source so that the footage can also be reviewed later. This inspection will allow for the understanding of the condition of the existing drainage pipes and will provide the data for evaluation and desired improvements. Hydraulic EvaluationThe existing drainage system will be evaluated using a computer Hydraulic Model ICPR in order to determine its capacity. The evaluation will be based on the Level of Service required for a residential neighborhood. Different design storms will be used according to the City standards. CITY OF SUNNY ISLES BEACH FLOOD CRITERIA LAND USE RAINFALL FREQUENCY FLOOD LIMIT Residential and Commercial Areas 5-year To Crown of street, or to within 15 feet of a dwelling or other occupied building, whichever is lower 2-Lane roads in residential and commercial areas 5-year, except 10-year for a bridge or culvert in the canal system.To Crown of street 4-Lane roads in high density, high traffic areas 10-year To outer edge of traffic lanes Private parking lots andSimilar paved areas 2 – year As per Section D-4 of Public Works Manual These criteria are outlined in DRER’s Policy for Design of Drainage Structure.