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Page 1: L-13 If-Then-Else

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Hydrologic Engineering Center 

IF-Then-Else Blocks

Adding Conditional Logic to the HEC-

ResSim Operation Scheme

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Need for if-then-else logic

Typically, water

control system

regulations follow

conditional paths

for decision-making

Conditions are used

to determine the

applicability of

operational goalsand constraints

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IF-THEN-ELSE in HEC-ResSim

Operational constraints with

conditional statements

Compound conditions

Nested if-then-else

current inflow < 85% of Average

Or current inflow < 50 cms

current inflow > 85% of Average

And current inflow < 120% of Average

current inflow > 120% of Average

And current Date > 20 Mar 2005

And current Date < 15 Apr 2005

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How to…Create an IF block

From the Operationstab of the ReservoirEditor, select a zonein your currentoperation set…

Select New from the

If_Block menuor

Right-click on thezone in the tree.

Select Add IF Block…from the context

menu Give your IF Block a

name…

Press OK

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Adding Conditions

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Specifying Test Values

Constant -> numericvalue

Date/Time ->

ddmmmyyyy, hh:mm

Current Time Step

Time Series ->External Variable,Model Variable, orState Variable

Seasonal -> ddmmm

( ) -> groupconditional tests

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Test Values – Time Series

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Test Values – Time Series

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Test Operators

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Compound Conditional Test

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Add rules to the IF blockAdd ELSE IF and/or ELSE blocks

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