Prior to Build 2005-05-AN: For culverts and bridges, storage based on using the channel width is also applied above the structure obvert according to the top width for B and R channels and the diameter for C channels. Also the No_of_Culverts attribute in the 1d_nwk layer was not used with a one culvert being adopted. This was a simplisitic approach adopted on the basis that bridges and culverts generally have an insignificant contribution to the storage in a model. In these cases, if the additional storage above the obvert is a significant component of the overall storage in the model, separate NA tables may need to be specified where appropriate.
As of Build 2005-05-AN: For models where the storage contributed by culverts and bridges is significant (eg. urban pipe model), use Storage Above Structure Obvert to more correctly determine the storage contributed by these channels.
