Erratum to: Environ Model Assess (2012) 17:275–288

DOI 10.1007/s10666-011-9291-1

Unfortunately, equation 3 was incorrect. The corrected version of equation is given below.

$$ \nabla \cdot {{\bf U}} = \frac{{\partial u}}{{\partial x}} + \frac{{\partial v}}{{\partial y}} = 0, $$