The Elevations tab features two sections: Active Elevations and Record Drawing Elevations.  These fields are described in the tables below:
Active Elevation Field Name  | 
Definition  | 
US Rim  | 
Rim elevation of the upstream drainage structure.  | 
DS Rim  | 
Rim elevation of the downstream drainage structure.  | 
US Invert  | 
Flow channel elevation at the upstream structure.  | 
DS Invert  | 
Flow channel elevation at the downstream structure.  | 
Record Drawing Elevation Field Name  | 
Definition  | 
Record US Rim  | 
The upstream rim elevation listed on the record drawing.  | 
Adj US Rim Elev  | 
The adjusted upstream rim elevation.  | 
Record DS Rim  | 
The downstream rim elevation listed on the record drawing.  | 
Adj DS Rim Elev  | 
The adjusted downstream rim elevation.  | 
Record US Invert  | 
The upstream invert elevation listed on the record drawing.  | 
Adj US Inv Elev  | 
The adjusted upstream invert elevation.  | 
Record DS Invert  | 
The downstream invert elevation listed on the record drawing.  | 
Adj DS Inv Elev  | 
The adjusted downstream invert elevation.  |