This type of situation happens with hydrant laterals, which is why flushing programs are carried out. The model results are basically telling you that you have a potential water quality problem here that you may need to address. If you're looking at timestep 637 hours, it means that the water has been sitting stagnant in that pipe for the entire duration (the default initial water age is zero). Environmental Protection Agency forecasts that the rate of replacement will rise until 2035, as national investment in water mains peaked in the boom years after World War II. So, it means that at the time step you're looking at, the water in that pipe has been in the system for 637 hours. The need to replace these pipes, most of which have a useful lifespan of more than 75 or 100 years, will continue to grow. New water only enters from a reservoir or inflow (negative demand). The calculated age represents how long the water in that pipe/node has been in the system. This is why you see the high age being reported.
The City experiences an average of 1,100 watermain breaks annually. I hate to DNF a book early but I am on chapter 4 and have absolutely no care for the main character or the plot. If your water usage drops, a temporary solution is to flush your mains to. But of all the risks besetting New Yorks water system, experts said yesterday, nothing causes more problems than its sheer vintage. Disinfectant levels drop when water stands still in your system. If water never leaves the system and is stagnant (zero velocity) such as with a dead end with no demand as you pointed out in the screenshot, it will continue to age as the simulation progresses. The average age of Toronto’s watermains is 61 years: 11 per cent are 80-100 years of age 13 per cent are more than 100 years old Watermain pipes are buried about 1.8 m deep, just below the the frost line. Gaskets can deteriorate and weaken them at critical joints. You can read more details in the Help under Contents > Technical Reference > Water Quality Theory. Asked by: Paul Leslie, Chelmsford As Earth was intensely hot following its formation 4. The governing equations for WaterGEMS / and WaterCAD's water quality solver are based on the principles of conservation of mass coupled with reaction kinetics. Water, water, everywhere but its a mystery where it came from.
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