Civil Engineers with Experience Using the Colebrook Equation?

[MNH]

(02-07-2021 04:17 AM)Fred Lusk Wrote:  While the Mathcad solution won't necessarily be useful for programming a calculator, you may find the rest of the analysis useful for practical hydraulic calculations.

Programming a calculator is secondary to my interest in using an iterative approach in problem solving. It's my understanding that the goal of an iterative approach is to make each side of an equation more equal to or equal to zero. In general, how many iterations are necessary to satisfy this requirement? I assume this requirement depends on what you're trying to approximate and on personal experience of what is "close enough." I want to extend this line of thinking to my line of work, surveying, in order to solve "what if" problems such as curve fitting. Thanks for responding!