The Requirement Analysis And Design Of GIS Applied In Water Distribution System

Information quantity of water distribution system(WDS) is larger and larger because of the rapid updating of urban construction and establishments of WDS. The application of information technology bring a new technique to manage WDS and many problem about manual management of WDS got resolved. As one of information methods, GIS in WDS gets to apply in production, however, there is a lack of systemic principle and method about analysis and design of specialized GIS.The expansion of WDS led to the rapid increase of information quantity of WDS. So the concepts about information management of WDS is intangible in many water utilities. Based on detailed systemic requirement anaysis, the basic status of GIS in WDS information management was established and the relation between GIS and other information systems was discussed. The objects of systemic design is to reasonably manage topological structure and attributes of WDS, to manage the assets of WDS by spatial analysis of GIS and to provide fundamental data in advanced decision-making.According to the requirement analysis of departments using GIS, operation flow, development object and mode of system, the data of WDS were classified as static data, dynamic data and equipment dynamic data. Function modules of GIS is divided into management of map database, input and edit of WDS, query and statistic about WDS attribute information, equipment management. While dynamic management about accessorial equipments in WDS was emphasically put forward and the specialized operation about valves, hydrants,water meters had been designed Spatial database(DB) was designed by drawing layer management, which was classified as map layer, WDS layer, equipment layer(valve, hydrant, water meter etc.), character layer, area layer. Attribute database provided the attributes of entities in WDS, such as diameter, material, depth of pipelines. The link of spatial DB and attribute DB had been carried out by qualifying the same ID (indentificaion) number for graphic element and relevant attribute.In the finality, there is an application example and the GIS system was assessedand evaluated through actual using effects, such as operation rate and stabilization, easiness, query and statistic, valve-closing, equipment management.