. . "I. Survey description and pilot observations"@en . . . . . . . . . . "2011"^^ . . "aa15938-10" . . . . . . . . . "ESO" . . . . . . "\u00A9 ESO, 2011" . . "2011"^^ . . . . . "We introduce a new, very deep neutral hydrogen (H i) survey being performed with the Westerbork Synthesis Radio Telescope (WSRT). The Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) Survey is producing an archive of some of the most sensitive H i observations available, on the angular scales which are most useful for studying faint, diffuse gas in and around nearby galaxies. The survey data are being used to perform careful modeling of the galaxies, characterizing their gas content, morphology, and kinematics, with the primary goal of revealing the global characteristics of cold gas accretion onto spiral galaxies in the local Universe. In this paper, we describe the survey sample selection, the data acquisition, reduction, and analysis, and present the data products obtained during our pilot program, which consists of UGC\u00A02082, NGC\u00A0672, NGC\u00A0925, and NGC\u00A04565. The observations reveal a first glimpse of the picture that the full HALOGAS project aims to illuminate: the properties of accreting H i in different types of spirals, and across a range of galactic environments. None of the pilot survey galaxies hosts an H i halo of the scale of NGC\u00A0891, but all show varying indications of halo gas features. We compare the properties of detected features in the pilot survey galaxies with their global characteristics, and discuss similarities and differences with NGC\u00A0891 and NGC\u00A02403."@en . "The Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) survey"@en . . . .