2005-02-09 CC Packet - Laserfiche WebLink

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Figure 28: Step 5 in Determining excessive III " Allowable Peak FlOw Excessive III is the difference between the allowable peak flow and the sum of the wet weather In and the peak dry weather flow - 10 Step 5: Add lhe peak hour of III to lhe dry weather flow peak hour and compare to the a a owa epea ow .. Peak hour of 111 w o ! . . . . ~ o 61181030:00 6/191030:00 61201030:00 6121/030:00 61221030:00 61231030:00 6124/030:00 61251030:00 61261030:00 61271030:00 61281030:00 Communities with Excessive III MCES has analyzed the last three years of flow records for each community to identify tributary areas with excessive VI. For each area, the average flow was determined and a representative dry weather period was selected. For most areas, the representative period selected is the first week of April in 2001. The allowable peak hour flow, based on the MCES peak to average ratio, was determined for each average flow. Peak III flow rates were identified by evaluating the flow records during and after significant rainfalls in the vicinity of the area under evaluation. The III component of flow was determined by subtracting the representative dry weather flow pattern from the wet weather flow pattern and the maximum VI flow rate was established. Flow information for communities with peak III rates that could cause peak hour flow exceeding the acceptable value is listed in Table 8,on the following pages. Added information, in the form of hydro graphs by metered service area, can be found in the supplement to this document. Cities may request the information on the meters in their service areas. 3