  A theoretical estimate of the explicit time dependence of a drainage water of
shallow lakes is presented as an important contribution for understanding the
lake dynamics. This information can be obtained from a sum of functions,
largely used in fitting of experimental data. These functions were chosen
because their centre and weight yield a good description of the water basin
behaviour. The coefficients of these functions are here extracted using results
of measured and / or calculated data for the state variables describing the
shallow West Lake, Hangzou. This procedure can also be applied to other shallow
lakes, generating geological information about their drainage basin, which is
one of the most important parameters to describe their micrometeorological
behaviour. One concludes this work emphasizing the relevance of the explicit
time dependence of the drainage variables and the requirement of measured data
to validate this approach.
