  In this article, we propose an approach to leak localisation in a complex
water delivery grid with the use of data from physical simulation (e.g. EPANET
software). This task is usually achieved by a network of multiple water
pressure sensors and analysis of the so-called sensitivity matrix of pressure
differences between the network's simulated data and actual data of the network
affected by the leak. However, most algorithms using this approach require a
significant number of pressure sensors -- a condition that is not easy to
fulfil in the case of many less equipped networks. Therefore, we answer the
question of whether leak localisation is possible by utilising very few sensors
but having the ability to relocate one of them. Our algorithm is based on
physical simulations (EPANET software) and an iterative scheme for mobile
sensor relocation. The experiments show that the proposed system can equalise
the low number of sensors with adjustments made for their positioning, giving a
very good approximation of leak's position both in simulated cases and
real-life example taken from BattLeDIM competition L-Town data.
