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Why Pressure (calculated residual) field is N/A?
Residual pressure field is available for fire flow analysis, but that is shown as N/A for the hydraulic analysis, flushing, water quality analysis etc.
Residual pressure is nothing but the calculated pressure at any node.
Pressure (calculated residual) field is basically used for fire flow analysis only to understand how much residual pressure is there at that junction or hydrant. Apart from fire flow analysis Pressure (calculated residual) field is calculated as N/A for all other types of calculations.
http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/2614.understanding-automated-fire-flow-results
http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/3008.watergems-v8-automated-fire-flow-faq