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15 minute running average rate of elevation change

jdurdella Oct 31, 2016 08:41 PM

Hi All.  I have a vibrating wire pressure transducer hooked up to a CRVWseries datalogger that is monitoring water level fall in a tunnel that is being drained.  It's crucial for the client to know the drainage rate and drainage rate over a moving 15 minute interval.  Using RTMC I need an expression for a graph that will show a running 15 minute rate of water elevation change.  I'm not very savvy at writing expressions.  Any help would be appreciated.  I was thinking of using the Statistical Function: AvgRunOverTime, but I'm not sure how the structure of the expression should look for my data input "Server:CRVWSeries.VW_Data.TunnelDrain_WaterElev".  Thanks in advance.

-Joe

Makada Oct 31, 2016 09:02 PM

AvgRunOverTime("Server:CRVWSeries.VW_Data.TunnelDrain_WaterElev",Timestamp("Server:CRVWSeries.VW_Data.TunnelDrain_WaterElev),15*nSecPerMin)

Cheers,

Mark

jdurdella Oct 31, 2016 09:03 PM

Thanks Mark.  I'll give it a try.

-Joe

jdurdella Dec 29, 2016 12:19 AM

Mark, the expression above allows me to graph water elevation averaging over 15 minutes, but how do you add in an expression to calculate rate change of water elevation (in feet/hour)?  Is there a function for that?

Thanks.

Joe

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