Mains savantes

WARP - water mains renewal planner

Neumann Comparison Results in Cylindrical Do- mains

We consider the question: To what extend does the Weyl function (i.e., the abstract Dirichlet-to-Neumann map) see the same singularities as the resolvent of some restriction of the maximal operator. The proper, so-called detectable, subspace will be introduced and analyzed for particular examples, such as, Schrodinger operators, Hain–Lust operators, and (if time permits), the Friedrichs model o...

Mains Signal Propagation through Distribution Systems

This paper looks at a power quality problem termed “Racing Clocks” caused by the amplification of ripple frequency signals in distribution networks. A study of this problem has been undertaken on two 22kV feeder systems within the Sydney area. These two particular feeder systems were chosen as they have caused problems in the past. The purpose of this study was to determine whether the problem ...

Data-Driven Study of Discolouration Material Mobilisation in Trunk Mains

It has been shown that sufficiently high velocities can cause the mobilisation of discolouration material in water distribution systems. However, how much typical hydraulic conditions affect the mobilisation of discolouration material has yet to be thoroughly investigated. In this paper, results are presented from real turbidity and flow observations collected from three U.K. trunk main network...

Comprehensive review of structural deterioration of water mains: statistical models

This paper provides a comprehensive (although not exhaustive) overview of a large body of work carried out in the last twenty years to quantify the structural deterioration of water mains by analysing historical performance data. The physical mechanisms that lead to pipe failure often require data that are not readily available and are costly to obtain. Thus, physical models may currently be ju...