We compare some first order well-balanced numerical schemes for shallow watersystem with special interest in applications where there are abrupt variationsof the topography. We show that the space step required to obtain a prescribederror depends on the method. Moreover, the solutions given by the numericalscheme can be significantly different if not enough space resolution is used.We shall pay special attention to the well-known hydrostatic reconstructiontechnique where it is shown that large bottom discontinuities may be neglectedand a modification is proposed to avoid this problem.
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