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We present observations of the 5$_{1,5}\to4_{2,2}$ transition of water vaporat 325.15 GHz taken with the CSO telescope towards Orion IRc2. The emission ismore extended than that of other molecular species such as CH$_3$OH. However,it is much less extended than the emission of water vapor at 183.31 GHzreported by Cernicharo et al (1994). A comparison of the line intensities at325.15 GHz and 183.31 GHz puts useful constraints on the density andtemperature of the emitting regions and allows an estimate of H_2O abundance,x(H_2O), of $\simeq10^{-4}$ in the Plateau and $\simeq10^{-6}-10^{-5}$ in theRidge.Comment: 4 figure

Physical Conditions in Shocked Regions of Orion from Ground-based Observations of H[TINF]2[/TINF]O