HEC-ResSim 3.5 User's Manual Advanced Features IF_Blocks Current: Editing IF_Blocks PDF Download PDF Download page Editing IF_Blocks. Current page Include child pages All pages Editing IF_Blocks There are three steps to editing IF_Blocks, although they can be addressed in almost any order:Adding (and/or Deleting) ELSE IF and ELSE Conditional BlocksDefining the Conditional Expressions of the Conditional BlocksSpecifying the Rule Set for each Conditional BlockThe following sections describe these steps. ×