AnsweredAssumed Answered

Mid-pipe Attribute Changes

Question asked by gambrels on Dec 13, 2012
Latest reply on Feb 6, 2013 by Woodwa
Hi All.  I'm not sure if this is the best forum for this question, as I am dealing with sanitary sewers, but here goes:

Our sewer pipes are represented as polylines and manholes are points.  The datasets are simple featureclasses in a geodatabase - they are not part of a linear network or have any other SDE-side relationships.  Pipes are segmented as different features between manholes, if attributes change between manholes.  We have new Asset Management software which treats the pipes as running contiguously between manholes; changes in attributes are represented as events, occurring a measured distance from a known point.  I need to make our data work in and with our new Asset Management software.


In a nutshell, I need a solution which uses unsplit pipe geometry between manholes, while retaining the information where attributes change mid-line. 


I have considered a linear network, however I have (at least) two requirements:
1 - that the attributes of each dataset are linked, so that changes to one are automatically represented in the other, and
2 - that thematic maps can be made showing different segments of each pipe differently - i.e. changes along the line are represented not as points, but as segments between pioints. 

Will a Linear Network / Dynamic Segmentation accommodate this situation?  Or can anyone suggest a solution otherwise??

Thanks!!
Sean



Background (lengthy but may be helpful):
Our sanitary sewers have a number of pipes that are well over 100 years old and in many places manholes are few and far between.  Because of this, there are numerous places where the pipes have been spot-repaired and so critical attributes of the feature change between manholes.  Also, our old brick sewers were built with vertical curves, so slope also regularly changes in between manholes.  We need to know where such changes occur. 

To represent changes in between manholes, we have split the pipe geometry where attributes change.  To stick with our naming converntion (pipe are named for its upstream manhole), we have appended the unique ID of these segmented pipes with a ".1", ".2", etc.  So this way each segment still has a unique ID while retainnig a sequential relationship with the pipes and manholes around it.     

Recently our Sewer department has gone to the NASSCO PACP/MACP assessment and management standards, and is in the midst of integrating our GIS information into an Asset Management software which also works with these standards.  These standards, and particularly this AM software, requires that a pipe segment is defined between manholes and is not split. 

We are still using 9.31 but are right on the cusp of migrating to 10.1.

Outcomes