Open circular channel flow. The Manning Equation We will work in US customary units here. The variables are Q discharge rate (cf/s) n Manning coefficient (0.012 for cement) A area of the water in the channel (ft^2) D diameter of channel (ft) P wetted perimeter (ft) So slope of channel Cu a constant (1.486 in customary units; 1 in SI units) https://youtu.be/nrolmswxemU

SMath Primer 36page Solving (not root finding) https://youtu.be/0btXhySbj08

Another solve () example https://youtu.be/LtgVqaoivjo

Function solve() to solve cubic https://youtu.be/ONVwFSCOpdQ

Smath Primer P33 https://youtu.be/gTL-Kls6d_U

SMath Primer p32. System of non-linear equations https://youtu.be/7-2QSt8_vQA