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Final Report <br />City of Paris, Texas <br />Wastewater Collection System Capacity Analysis <br />While this information is useful, a more detailed characterization of the <br />system can be performed by "netting" the flows. Subtracting the upstream <br />flows from the meter under study yields "net" flows. Note that under certain <br />hydraulic conditions netting flow rates that determine shape is not possible. <br />If the lines between the upstream and downstream meters are surcharged, the <br />hourly peak flow rates at one part of the system may be significantly delayed <br />in reaching the downstream site. <br />Dominant Defect Flow Type <br />A detailed look at the net "shape" or hourly variation of flow rates, yields detailed <br />information about the type of defects that are located in the metered basin. For example <br />a basin that responds quickly to a rainfall event and recovers quickly from that event is <br />dominated by inflow defects. While a metered basin that responds very slowly is more <br />indicative of rainfall induced infiltration. Of course the most desirable situation is to <br />have no response to the rain event. See examples of system responses in Figures 4 and 5. <br />Figure 4- Inflow Dominated Response <br />Inflow Dominated Response <br />3.00 <br />2.50 <br />p 2.00 <br />~ <br />a 1.50 <br />a <br />3 <br />~ 1.00 <br />0.50 <br />0.00 <br />Time of Day ■ lnFlow ■ Rain <br />3.00 <br />2.50 <br />2.00 ~ <br />~ <br />c <br />7.50 _ <br />~ <br />c <br />1.00 ~ <br />0.50 <br />0.00 <br />10 <br />1 4 7 10 13 16 19 22 <br />