Weather Risk Assessment for Collective Water Supply and Sewerage Systems

Abstract

The weather derivatives market as an instrument of effective weather risk management is still not flexible enough for many industries. The water supply and sewerage industry is sensitive primarily to heavy rainfalls and periods of high and low temperatures: days with heavy rainfall may cause a hydraulic overload of the sewerage systems; on hot days, the water demand increases significantly; on frost days, the risk of water pipe failure grows. The work aimed to summarise methods of weather risk management and propose indices that will help to protect the interests of the water supply and sewerage industry in Poland. Three indices were proposed: a daily precipitation index, frost day index, and hot day index. The frequency of reaching these indices in Poland was verified with the use of meteorological data from 1970–2019, for 19 locations. The non-parametric Mann-Kendall test was used to determine the climate change impact on the exceedance frequency of the proposed indicators. The results showed that the indexes were exceeded in the past once every 6 years, on average. The hot day index was exceeded the least often, but it was the only one with a clear (growing) trend observed.

The Impact of Climate Change on the Failure of Water Supply Infrastructure: A Bibliometric Analysis of the Current State of Knowledge

“…Researchers also raised the topic of the resilience and reliability of water supply systems to climatic factors in works [57][58][59][60]. In recent years, research has been continued on the perception of risks to the operation of water supply systems resulting from climate impacts, such as weather risk, flood risk and operational risk [61][62][63][64].…”

The Failure Risk Analysis of the Water Supply Network

“…An example that highlights the issue is a failure associated with pipeline corrosion. Potential factors contributing to this could include soil corrosion, insufficient passive and active corrosion protection measures, or corrosive properties of the water [32,33]. Furthermore, the duration of operation alone is not always the primary factor behind a network section's high failure rate.…”

The Effects of Underground Water Treatment Before and After the Modernization of the Water Treatment Plant

“…This is especially important in the context of climate change, when water companies are required to adapt, protect existing water resources and look for alternative water sources [Gwoździej-Mazur et al, 2022]. Water and wastewater companies are sensitive to periods of high and low temperatures, as days with heavy rain may cause hydraulic overload of the sewage networks, while on hot days the demand for treated water increases significantly [Rak et al, 2021]. Low concentrations of iron and manganese in water are not harmful to health.…”