Settlement development depends on many factors, including the availability of municipal infrastructure. Scientists find that only integrated municipal infrastructure planning and settlement-development planning create conditions for sustainable and economical urban development. This is not taken into account in spatial planning practise in Slovenia. This paper seeks a response to the research question: Based on what data, and based on what model can the capacity of the water supply system in Slovenia be assessed, which constitutes the expert basis for settlement development decision-making at the local level. To this end, we analysed the results of relevant existing research and devised an appropriate integrated and dynamic model for assessing the capacity of the water supply system, which was generated from a simulation of construction on vacant building land and relevant water requirements of new water consumers. In assessing the capacity of the public water supply system, the Aquis 7.0 Software was applied in accomplishing the hydraulic system validation. In line with the hydraulic system validation results, the respective measures are proposed, and the costs of necessary improvements of the existing water supply system or its upgrading are envisaged. The model was applied on the example of the Municipality of Kranj. Razvoj naselij je odvisen od številnih dejavnikov, med drugim od razpoložljivosti komunalne infrastrukture. V zvezi s tem znanstveniki ugotavljajo, da le integrirano načrtovanje komunalne infrastrukture in načrtovanje razvoja naselij ustvarjata razmere za trajnosten in ekonomičen urbani razvoj, kar pa se v praksi prostorskega načrtovanja v Sloveniji ne upošteva. V članku smo iskali odgovor na raziskovalno vprašanje: Na podlagi katerih podatkov in na podlagi kakšnega modela lahko v Sloveniji ocenimo zmogljivost vodovodnega sistema, ki je strokovna podlaga za odločanje o razvoju naselij na lokalni ravni? V ta namen smo analizirali rezultate že izdelanih raziskav z obravnavanega področja in oblikovali integriran dinamični model za oceno zmogljivosti vodovodnega sistema, ki izhaja iz simulacije gradnje na nepozidanih stavbnih zemljiščih in potreb novih porabnikov na teh zemljiščih po vodi. Hidravlična preveritev za oceno zmogljivosti vodovodnega sistema je izvedena z računalniškim programom Aquis 7.0. Glede na rezultate hidravlične preveritve so predlagani ukrepi in ocenjeni stroški ustreznih izboljšav obstoječega vodovodnega sistema oziroma njegove dograditve. Model za oceno zmogljivosti vodovodnega sistema je bil apliciran na primeru mestne občine Kranj.
