The specific of small mountainous catchment is that precipitation is very changeable in spatial scale and on the other hand small number of raingauges is available. Therefore the problem of precipitation field estimation is more difficult.
The first step is spatial interpolation of raingauge data which is performed using block-kriging technique. Next data from both sources (raingauge measurements after spatial interpolation and radar data) are merged using Kalman filter for Bayesian combination. The both steps are carried out with more simple methods based on weight distance as well.
Quality of estimated precipitation field is controlled basing on statistical analysis where “true” precipitation field is unknown.
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