Is there a method to use a main drain test to calculate the hydraulic curve at the riser itself?
I haven't done it myself, but using a static pressure at the riser, with a residual pressure at the riser, and then to gather the flow a pitot reading on the main drain discharge to measure how much flow?
If the flow discharge outside was greater than the demand of the system, conceivably a hydraulic calculation could be made with the riser as the source point, and with more accuracy than a hydrant flow test somewhere near the site.
Obviously if a backflow test header or hose valve were supplied, a higher flow could be obtained with a better curve.
I heard this mentioned recently so it's just theory to me, but for small remodels having a setup like this could be far simpler (and potentially more accurate) to know the available water supply at the system.
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