Open Channel Geometry: rectangular
Hydraulic geometry section properties for standard open channel cross-sections — rectangular, trapezoidal, triangular, parabolic, and circular (partial flow y/D = 0.05–1.0). Provides symbolic formulas and pre-computed normalized coefficients for area (A/D²), wetted perimeter (P/D), hydraulic radius (R/D), and top width (T/D) as functions of depth ratio.
| channel shape | record id | area formula | critical depth formula | hydraulic depth formula | hydraulic radius formula | normal depth note | section factor formula | top width formula | wetted perimeter formula |
|---|---|---|---|---|---|---|---|---|---|
| rectangular | formula | A = b*y | y_c = (q^2/g)^(1/3) | D_h = y | R = b*y / (b + 2*y) | Trial; R = A/P in Manning's Q = A*R^(2/3)*S^(1/2)/n | Z = b*y^(3/2) | T = b | P = b + 2*y |
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