Photodetachment of the outer shells of the excited $^{2}D$ state of ${\mathrm{C}}^{\ensuremath{-}}$ using an augmented $R$-matrix theoretical methodology has been studied from threshold to $11\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. Total and partial cross sections and photoelectron angular distribution asymmetry parameters have been obtained. Excellent agreement between length and velocity formulations is found. In addition, agreement with experiment at $2.076\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ for both cross section and $\ensuremath{\beta}$ for photodetachment to the ground $2{s}^{2}2{p}^{2}\phantom{\rule{0.2em}{0ex}}^{3}P$ state of C is quite good. The results exhibit many examples of Auger decay of shape resonances. Comparison with a previous calculation shows fair agreement except near threshold.