a structure on a stream or canal that is used to regulate the flow or stage of the stream or to prevent the intrusion of salt water.

Man-made structures that regulate the flow of waters or the levels of waters.

a structure such as a weir, gate or regulator located at a point in a sewer where flows can be detained or diverted in a different direction to prevent sewer pipes from becoming overloaded.

a combination of keywords in code used to make a decision that alters the flow of code the computer executes

a framework for organizing decisions on when actions of a plan can be applied and how they should be combined

a programming structure that allows your script/program to make decisions based on a certain set of commands and on the information provided

The beginning and ending (header and trailer) segments for entities in electronic data interchange.

an expression whose evaluation may alter the otherwise sequential order of evaluation of expressions.

a way of grouping instructions together, just as a data structure is a way of grouping data together

a way to control what processes occur when