Logical Quality Check of Landscape BIM Models Using Visual Programming Languages† - Case Study on Calculating the Amount of Stormwater Management Facilities in Apartment Complexes -

The government has recently prepared the basic and implementation guidelines for BIM to facilitate the full adoption of BIM in the construction sector, providing methods and procedures for the creation, delivery, and use of BIM outcomes. Although the landscape architecture field still faces challenges in adopting BIM as a specialized discipline, it is essential to prepare application methods and practical techniques to prepare for future guidelines. This study provided the basis for using VPL(visual programming language) to conduct logical quality checks, a critical procedure for securing the reliability of BIM data, and proposed a method for performing quality checks through the development of an algorithm. In particular, an algorithm was developed using Dynamo for Revit to address the complicated calculation process required by stormwater management systems, which involve attribute information from various BIM objects and quantity take-off data. The algorithm was then applied to a landscape architecture project of a residential complex. The BIM model for the site, including terrain, the partial and spatial objects of infiltration, and utilization facilities, was constructed. The algorithm was executed to perform logical quality checks on the adequacy of stormwater management system quantities. In this process, it was confirmed that the calculation was applied accurately by using the BIM-based algorithm and that the following advantages were achieved. First, the results were updated in real-time by re-executing the algorithm as the quantity was changed by modifying the arrangement of the parts and spatial objects of the BIM model. Second, it was possible to perform integrated calculations by collecting various category-specific objects and attribute information of the landscape BIM model and quantity calculation data using different units. Third, it was possible to apply consistent criteria in logical quality reviews and exclude different applications by utilizing the attribute information entered in the parts and spatial objects of the landscape in the BIM model. The significance of this study lies in providing the starting point for applying domestic BIM guidelines in the landscape architecture field and suggesting a method to overcome the limitations of BIM authoring tools using VPL. In the future, it is necessary to promote the use of digital design tools that have been lacking by creating customized algorithms with VPL for specialized and specific design work in the landscape architecture field and sharing and accumulating them as open source.