Optimum Design of Straight Circular Channels Incorporating Constant and Variable Roughness Scenarios: Assessment of Machine Learning Models

Table 2

Chronological review of explicit equations available for computing circular channel geometries.

Researchers	Equation number	Proposed relation
(a) For flow-independent Manning’s coefficient
Swamee et al. [8]	(i)
	(ii)
Aksoy and Altan-Sakarya [3]-first model	(iii)
	(iv)
Aksoy and Altan-Sakarya [3]-second model	(v)
	(vi)
Niazkar and Afzali [12]	(vii)
	(viii)
(b) For flow-dependent Manning’s coefficient
Niazkar et al. [26]-first model	(ix)
	(x)
Niazkar et al. [26]-second model	(xi)
	(xii)