Hi,
Does anyone have a good feel for what are acceptable ranges for fitness numbers when using the Darwin Calibrator function? I am calibrating a large water system and don't have many data points to calibrate to. I have static and residual data for about 10 hydrant pairs throughout the site. I am getting fitness numbers ranging from 600 to 1000. Are these numbers too high? The percent difference in observed vs. simulated HGL varies between 10% - 20%. Any advice would be helpful. Thank you!
Lindsay - sounds exciting! (Calibration is my favorite area!) A few tips to consider:
-for the 10 hydrant flows. Likely these were done at different times during the day. The boundary conditions (tank elev, pump stat etc) may have been different or slightly different than the previous flow test - good to confirm all boundary conditions for the exact time of the flow test. Thankfully Darwin can accommodate those in the Boundary Overrides tab.
-older pump curves differ from manuf. curves - that could keep fitness up,
-some vales may be closed in reality (Darwin can help out on this with this by changing the status)
At the end of the day, it's difficult to determine which solution may be better or worse without further investigation and confirmation of demands, c-factor testing etc. And it is for that reason calibration = excitement, you are on a limited quest to reduce error to the lowest point before budget or time runs out. Best of luck and please let us know how it went!