. Nous-allons-utiliser-la-seconde-formule, plus pratique dans notre cas. Localement, l'équation de la cuvette, selon la plus grande pente peut être assimilée à un cercle de centre Cp et de rayonRp" (figure IX, courbe noire) dont l'équation paramétrique dans le repère (Cp', xP, y) est la suivante

. Avec, les cordonnées dans le repère (Cp' , Xp, y) et "8 1 " l'angle entre la verticale descendante et le point considéré (point M sur la figure IX)

. Localement, équation de la cuvette, selon l'axe de la coupe peut être assimilée à une ellipse de centre Cc, de petit axe de rayon "Rp" et de grand axe de rayon "k.Rp" (figure IX, courbe verte) dont l'équation paramétrique dans le repère (Cc', Xc, y) est la suivante

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