Agmt03 BKF Engineers (2) - Laserfiche WebLink

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ITEM B -MODEL INFORMATION ($2,134) The existing model currently labels the individual pipes with a numbering system that does not relate to the City streets or other know feature. Because of this lack of reference the time required to modify or manipulate the model is difficult. BKF will propose a labeling protocol for the elements of the water model. Once the protocol is approved by the City, BKF will relabel all 312 existing pipes and 243 junctions of the existing model. Consequently, all new pipes in the model will be labeled in accordance with the protocol. ITEM C - FIRE HYDRANT ($388) The calibration of the water model will be performed by simulating hydrant flows and pressures observed during the hydrant tests of the water system. BKF will select the number and location of the hydrant tests needed to calibrate the upgraded model. We have assumed the City will perform the hydrant tests selected. BKF also proposes to use the fire hydrant tests to evaluate the typical Hazen- Williams (HW) pipes roughness coefficient. The technique uses two consecutive fire hydrant tests performed on one water line. Based on the two hydrant test results, a modified Hazen-Williams equation is used to determined the actual roughness coefficient of the pipe. BKF will select the water lines to evaluate based on typical pipe used. ITEM D - WATER DEMAND ($6,208) The water model currently includes water demand from Supervisory Control and Data Acquisition (SCADA) monitoring stations located across the water distribution system. The water demand included in the model was distributed based on those monitoring station recordings and distributed with an approximated service area. BKF proposes to update the model water demand using individual meter recordings. The individual recordings will provide a more accurate distribution of the water demand across the water model. The City will provide the annual individual meter recordings for the area simulated by the water model in an Excel spreadsheet file. BKF will manipulate the meter recording data to represent sectors of the water system and their seasonal demand. We have assumed that the water demand will be distributed over 15 sectors and include 4 seasons. BKF will upgrade the water model with the proposed sub-divided water demand. In addition BKF proposes to evaluate daily peak water demand based on the SCADA monitoring station data provided by the City. We will conduct the study using charts of the daily demand fluctuation. BKF will upgrade the water model using characteristic ratios of the daily peak demand.