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<br />I~O <br />~ <br /> <br /> <br />determination of wastewater flows will be removed. Minor depositions of <br />silt will be removed by the field crews. Significant depositions are to <br />be removed by the OWNER. <br /> <br />6. Define Metering Subsystem and Flow Schematic. A schematic showing <br />the interconnection of each subsystem and flow monitoring site will be <br />prepared. <br /> <br />c. Flow and Rainfall Monitoring <br /> <br />1. Install and Service Flow Meters. An installation and removal plan <br />for flow meters will be prepared and reviewed with the OWNER. The plan <br />will provide the planned location for metering sites, and a schedule for <br />meter installation, periodic calibrations, data collection, and removal. <br />Monitoring will be performed under dry and wet weather conditions such <br />that a minimum of three rainfall events of various intensities will be <br />measured. From this data a relationship between peak inflow and <br />rainfall intensity will be developed from each monitoring site., <br /> <br />Flow data will be recorded every 15 minutes and averaged to determine <br />the hourly flow rate: Flow hydrographs will be developed for both dry <br />and wet weather. <br /> <br />All flow meters will be installed to operate concurrently.. Such an <br />arrangement provides improved data comparison and reducfd 9verall <br />project costs. <br /> <br />The flow monitor instruments will be velocity/depth flow meters. The <br />meters are totally self-contained, microprocessor controlled units that <br />measure and record both depth and velocity of flow in sewer systems at <br />programmed intervals. The main features of this unit are: <br /> <br />. Solid-state computer memory bank. <br /> <br />. Pressure or ultrasonic transducer for sensing depth of flow <br />and ultrasonic velocity tra~sducer sensing velocity. <br /> <br />. Internal clock providing a real-time synchronization. <br /> <br /> <br />. An interrogator;synchronizer to gather stored data and to <br />synchronize all units. <br /> <br />Velocity measurement will be achieved with a velocity probe. This probe <br />has no moving parts to foul and has streamlined design to prevent <br />collection of debris. <br /> <br />Depth measurement will be achieved by multiple solid state ultrasonics <br />or pressure transducer. Depth will be sensed to the nearest 0.01 foot. <br />The depth sensor is completely water tight and will continue recording <br />data even in surcharged conditions. The meters will perform equally <br />well under surcharged conditions or under non-uniform steady flow. Each <br />monitor will be calibrated prior to installation and verified a minimum <br />of four times during the course of the project. <br /> <br />06/02/93 <br /> <br />A-8 <br /> <br />