Hydrologiska aspekter på de höga europeiska elpriserna i augusti 2022
The electricity prices in Sweden and Europe during 2022 have reached very high levels. The main reason for this being the war in Ukraine, which has led to a decreased availability for gas. During summer, the electricity prices reached extreme levels when meteorological and hydrological factors worsened the situation on the electricity market. The highest […]
Impact of extreme flows on bridges. A case study from Lagan river, Ljungby
Flowing water impacts bridges over rivers primarily in two ways: (1) hydrodynamic forces that directly impact the structure and (2) scouring at piers and abutments, including contraction scour. The design prin-ciples for bridges in Sweden, including both impacting forces and local scour, are relatively simplistic. The purpose of this paper is to examine the impact […]
Storage and transport of water under water
Placing water tanks or water pipes under water has the advantage that the walls are subjected to a much lower pressure difference. An underwater tank, where the walls are made from a flexible material like canvas, instead of metal or concrete, can adjust its volume to exactly the volume to be stored inside. Tennis tents […]
Kostnader vid anläggning, drift och underhåll av dagvattendammar
The need for knowledge about operation and maintenance of stormwater ponds increases as the number of stormwater ponds in the country increases and the ponds get older. It is partly about how ponds can be managed in a cost-effective way, partly how operation and maintenance efforts should be planned and how they affect the values […]
Kontroll- och byggledarhandboken VA
Municipal water and wastewater pipe projects are often complex in terms of quality assessment, work environment, technology, time frames, personnel resources, and budget frames. If the water and wastewater pipes laid today are to maintain the service life that the Swedish Water and Wastewater Association (Svenskt Vatten) sets as a goal, 100 – 150 years, […]
Transienter i VA-ledningsnät – en statusbedömning för VA-sverige
Unintentional or planned operations of valves and pumps create pressure waves, called transients, which travel through pipe systems with the risk of, among other things, breakage and fatigue. Knowledge about transients in pipes and associated effects are not new. The problems with transients in Sweden were elucidated in a report published in the 1980s, where […]
Byggbar mark – hur utvalda aktörer värderar översvämningsrisk
Climate change is expected to increase the frequency of fluvial, pluvial, and coastal flooding which must be considered in spatial planning. More frequent floods will also affect financial stability by increasing the exposure of risk for insurance companies and creditors. This study investigates how selected stakeholders assess flood risk when planning for new development and […]
Hydrological modelling of a recycling facility with landfill
A parsimonious lumped model was developed for simulating a catchment composed of a landfill and recycling facility. The modelling results showed acceptable conformity with the observed values with NSE of 0.54 and R2 of 0.56 in hourly simulations, though the results were characterized by a general underestimation. The catchment model was coupled with a reservoir […]