Upcoming events

DRIZZLE Lunch Webinars in cooperation with Stormwater&Sewers

Online with Zoom

15 September 2026, 10:00-11:00

Stormwater&Sewers seminar in cooperation with Drizzle.

Treatment system or source of pollution?

In this seminar, Lea Hagen, PhD student at Luleå University of Technology, will present her research on PFAS, metal, and PAHs in roadside soils from Luleå, Stockholm, and Hamburg. She will discuss the occurrence and concentrations of these pollutants, their spatial distribution, and key influencing factors. The presentation will also relate the findings to current regulatory thresholds and highlight practical implications for the maintenance and management of roadside slopes.

Language: Swedish

10 November 2026, 10:00-11:00

Sampling strategies for continuous stormwater quality monitoring

How frequently should you sample to ensure representative stormwater quality data?

In this presentation, Henriette Nishimwe, PhD student at Luleå University of Technology, will shares insights from her research on representative sampling for continuous stormwater quality monitoring. She examines how sampling frequency affect accuracy of pollutant measurements and discusses findings from three catchments (commercial, residential, and roadway) in Luleå municipality, highlighting practical implications for monitoring design.

8 December 2026, 10:00-11:00

Which Metals Matter Most in Urban Runoff? Insights from a 20-Year Nationwide Risk Assessment over 182 events Across Sweden

Urban runoff is a major pathway for metals and metalloids to enter aquatic environments, yet environmental risks vary strongly depending on land use, season, and metal speciation.

In this presentation Ali Beryani, Postdoctoral reseacher at Luleå University of Technology, will summarize findings from a nationwide Swedish meta-analysis based on 182 stormwater and snowmelt events collected over 20 years across 15 urban catchments. The study identifies which metals/metalloids pose the greatest ecological risks, how risks differ between dissolved and particulate fractions, and how seasonal conditions influence their mobility and bioavailability. Practical implications for monitoring, source control, and stormwater treatment strategies will also be discussed.

• Contact: Lena Goldkuhl

Previous seminars

21 April 2026, 10:00-11:00

Doing more with fewer sensors; prioritizing stormwater measurement locations

In this seminar, Emmanuel Bangura, PhD student at Luleå University of Technology, will present his research focused on balancing monitoring efforts and data needs for urban stormwater models. He will highlight practical guidelines for strategically deploying flow and level sensors to obtain data for reliable model calibration, along with key lessons learned in the field. Results from a study examining urban drainage behaviour across nested sub-catchments will also be discussed.

Language: English

26 March 12:00-12:45

"Seaweed Based Porous Structures as a Novel Approach to Urban Flood Management"

During this research seminar Richa Sharma, visiting researcher on Wood and Bionanocomposites at LTU, will explain how seaweeds are transformed into porous structures, so that they can then be used to absorb water (stormwater). She will also highlight potential applications of the developed materials. Specifically, the materials demonstrate stability over repeated absorption–desorption cycles, indicating their suitability for cyclic water regulation. Furthermore, their low density and high water absorption capacity makes them promising substrates for green roof systems, where they can reduce stormwater runoff, and support vegetation growth, thereby contributing to urban stormwater management performance. Take the opportunity to learn more about this innovative DRIZZLE research, via Zoom. If you want to participate, contact Lena.Goldkuhl@ltu.se for more information and link to Zoom.

Language: English

26 of February 2026 at 12:00

Lunch Seminar - Social Transformation - from the Perspective of the Water Pipe

We are happy to announce that Petra Viklund, VA Manager at Lumire and Chair of both DRIZZLE - Center for Stormwater Management and Dag&Nät, to again give the highly regarded lecture she gave in November when she was appointed Honorary Doctor of Technology at Luleå University of Technology. This time, the lecture will be held digitally, so that everyone will have the opportunity to take part in it.
The lecture “Social Transformation – from the Perspective of the Water Pipe”

Petra Viklund will take you on a journey through Luleå’s history – from the city’s first water pipes to today’s circular and climate-neutral water and sanitation system. She will show how courageous decisions and long-term thinking have made Luleå a role model in water and wastewater management, and how the societies of the future require both technology, collaboration and changed behaviors.

November 25, 2025, 10:00–11:00
(DRIZZLE in collaboration with Stormwater&Sewers)

Smarter monitoring and management of stormwater

In this seminar, Nikita Razguliaev, PhD student at Luleå University of Technology, will present his research on various aspects of data collection, data management, and data use for stormwater management. Particular focus is placed on continuous time series of stormwater quality collected with online sensors. The presentation aims both to raise awareness of possible pitfalls along the path of digitalization and to inspire a broader use of data-driven tools and methods for managing stormwater.

October 15, 2025, 12:00–12:45

Stormwater sampling in the field – what can we learn from mistakes and challenges?

Within DRIZZLE we have collected stormwater samples at many sites across Sweden. As a rule, we have succeeded in obtaining our samples, but the road there has sometimes been filled with challenges and unforeseen problems. Godecke Blecken, Professor at Luleå University of Technology, summarizes and describes what can happen when sampling stormwater in practice, and how one can eventually achieve a successful outcome.

September 16, 2025, 10:00–11:00 – DRIZZLE and Dag&Nät
Effect-based toxicity testing of stormwater and stormwater sediments

In this seminar, Snezana Gavric, Postdoctoral researcher at Luleå University of Technology, discussed her results on the potential biological effects of exposure to runoff from roofs made of different materials. Haoyu Wei, Postdoctoral researcher at Luleå University of Technology, presented his research on the biological effects of sediments from stormwater ponds and compared the results with chemical analyses.

June 4, 2025, 12:00–12:45
Metal concentrations variations in urban runoff from various land use types in Sweden

Franz Geronimo, Postdoctoral researcher at Luleå University of Technology, presented results on metal concentrations in urban runoff. The seminar showcased findings from 15 study sites across seven Swedish cities and municipalities. In particular, the impact of base flow on stormwater quality in urban areas was presented. Language: English

May 20, 2025, 10:00–11:00 – DRIZZLE and Dag&Nät
Mapping PFAS in stormwater

In this seminar, Hannah Johansson, industrial PhD student at Växjö Municipality/Water and Wastewater Engineering, Luleå University of Technology, presented her research on PFAS in stormwater from six Swedish cities. She described the occurrence and variation of PFAS substances found in stormwater facilities and other stormwater occurrences, as well as the variation depending on different land uses and catchment areas.

April 16, 2025, 12:00–12:45
Effect-based toxicity testing of stormwater and sediments

In this seminar, Snezana Gavric, Postdoctoral researcher at Luleå University of Technology, presented her results on the potential biological effects of exposure to runoff from roofs of different materials. Haoyu Wei, Postdoctoral researcher at Luleå University of Technology, presented his research on the biological effects of sediments from stormwater ponds and compared the results with chemical analyses.

April 2, 2025, 12:00–12:45
Drivers affecting Aarsleff’s DRIZZLE activities

In this seminar, Lars Benzeriane, Technical Manager at Aarsleff Pipe Technologies, discussed current drivers influencing Aarsleff’s activities within DRIZZLE, such as new environmental requirements, Aarsleff’s research to meet these demands, and the future challenges and opportunities the company foresees.