This paper is dealing with polarimetric rainfall estimation using combined polarimetric variables include specific attenuation for a heavy rainfall case in Korea. It also describes how we could improve differential reflectivity (ZDR
) quality for operational use. We discussed the possibility of drop size distributions to correct ZDR and usage of R(Z,ZDR
) relation. The reason why we did the research is that we would like to get a representative relation without considering rainrate regime.