First, WaterCAD doesn't actually "compute peak hour demand" but it uses the demand you entered to compute the system hydraulics. Sushma's response is correct if you are running an extended period simulation (EPS) but from your question, it is not clear if you are running a steady state or EPS scenario. Assuming you may want to run a steady run at peak hour, and you have entered the average demand, you can use several approaches to get the results for peak conditions. The quick way is to go to Calculation Options Demand adjustments and enter the demand adjustment there (Multiply by 2). The preferred way is to create a new Demand Alternative and assign it to a Peak Demand scenario. Then go to Tools Demand Control Center, right click at the top of column labeled Demand and pick Global edit, multiply by 2. This will give you a new scenario you can repeatedly use and edit as you refine your design.
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