DELETE (2) - Laserfiche WebLink

Home Browse Search

3.3.5.1 POTABLE DISTRIBUTION SYSTEM CONSULTANT will perform a series of hydrant flow tests to refine roughness coefficients (C factors)for model calibration.CONSULTANT will develop a calibration. plan that identifies hydrants to perform flow tests on and will collect hydrant flow test data at these hydrants. This field data will be used to calibrate the model to simulate losses across the distribution system. CONSULTANT will adjust model parameters to balance the model to meet the calibration goals as indicated in the AWWA M32 "Computer Modeling Water Distribution Systems" Manual.All exceptions will be justified and documented.CONSULTANT will provide statistics for model calibration results. If SCADA data is available, the hydraulic model will be calibrated to a 7-day 068 hour) Extended Period Simulation(EPS).Time series data validation will be considered compared when the model is able to replicate the observed trends and minimum and maximum points. Individual time points in time series will not be compared. The following assumptions apply: • COUNTY is responsible for conducting all hydrant tests with COUNTY equipment and following all COUNTY protocols, • CONSULTANT will hold one(1`)virtual review meeting to present the final model and calibration results. • Hydrant flow test data to be collected and interpreted by CONSULTANT with operation of valves and systems provided by the COUNTY. CONSULTANT will provide one staff member to observe hydrant flow testing. CONSULTANT : not conduct hydrant flow tests. • One calibration meeting is assumed to be on-site at COUNTY offices in duration of 4 hours. • The COUNTY will collect pressure data as needed for main calibration. • A total of 40 hydrant flow tests are assumed. Schedule assumes 2 hours of CONSULTANT time per hydrant test and 8-hour workdays, totaling 10 field days. Final locations will be determined based on existing COUNTY flow test data, final goals and objectives of the model, and areas that are not within the boundary calibration range. • COUNTY will be responsible for setup, cleanup,traffic control, access, and customer notification ahead of testing, as needed. 3.3.5.2 WASTEWATER COLLECTION SYSTEM CONSULTANT will develop a calibration plan to identify needed flow, velocity, pressure, and level criteria for field data collection during a 12-month period to capture daily fluctuations in the COUNTY's wastewater collection system. Potential data collection includes: • Up to 3 insertion flow, velocity, and depth meters in the COUTY's gravity flow collection system. The COUNTY will install the insertion meters and collect the data on a monthly basis. • Up to 20 strap-on flow meters with data recording in the COUNTY's low- pressure vacuum station discharge points and/or repump station discharge points. The COUNTY will install the flow meters and collect the data on a monthly basis. CONSULTANT will compile the data monthly and share it back with the COUNTY for review.CONSULTANT will present findings from this data during up to four progress meetings. 7 307