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## Homework Statement

from the diagram , we know that the junction is lower than the pipe at B . why the author want to make an assumption that the junction is located at

**from the datum ? is it correct to do so ?**

*20m*## Homework Equations

## The Attempt at a Solution

eventually , i found the ans is 25.2m , the delta Q is close to 0 ,

but , i also tried with 18m , then slowly change to 16m and 14m , by using Q1+Q2 - Q3 , i found the ans is getting bigger , does it mean the junction has to be higher? [/B]

**P/s : to admin , hopefully , i moved to an appropriate place to get better response**