Werner;
The attached worksheet outlines my ultimate goal. This structure of the equations or requiems are called upon when particular conditions are met as shown on the diagrams and accompanying mass balance equations. This stormwater control structure is called a high early discharge tank. As you can see the tank has two chambers which become active when the water rises to particular levels in the first and second tanks. These different flow requiems which you have help me solve previously but this time all this knowledge needs to be stitched together. Unfortunately as you can see by the diagrams these must be switched on at certain times. Can you do this using a complex solve block? I thought one may be able to use an if statement in the solve block but this seems like it is not allowed. Is there another way to accomplish this for example can solve blocks become part of a programming block? What do you suggest? See the later parts of the worksheet for explanation.
You have been so helpful to me thus but once we solve this problem then my goal is achieved.
Kind regards, Mark