The impact of specific stormwater discharges on recipients - Detailed development planning and environmental quality standards
Typ
Examensarbete för masterexamen
Program
Infrastructure and environmental engineering (MPIEE), MSc
Publicerad
2021
Författare
Larsson, Klara
Pettersson, Johanna
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Stormwater poses a challenge with regards to urban expansion and the increase of impervious
surfaces, resulting in pollution of receiving waters. The Water Framework Directive was
adopted in the year of 2000 to tackle these issues. Sweden has adopted the Directive by
developing Environmental Quality Standards for water bodies. The work with reaching and
maintaining good status in all water bodies affects detailed development planning and its
involved parties. In this study, the challenges concerning assessing the impact from stormwater
discharges on the recipient when detailed development planning have been evaluated. A case
study and an interview study were conducted in this project. The traditional stormwater
assessment approach was evaluated using the modelling tools StormTac Web and MIKE
Urban+. The area Gröna Dalen located in Upplands-Bro was used as a case study area. The area
was evaluated by comparing the influence of different land use division choices, assessing its
contribution to the annual stormwater pollutant load compared to the surrounding watershed
area and by examining the possibility of developing site-specific guidelines. Results from
StormTac showed that the land use division has a significant impact on the resulting stormwater
pollution. The results also showed that the contribution of stormwater pollutant load from a
delimited area compared to the entire watershed area was quite small, and that in order to
develop proper site-specific guidelines, more input data would be required. Results from MIKE
Urban+ were similar to StormTac results. The main impediment to stormwater quality
modelling in detailed development planning was deemed to be lack of input data. However,
there is an interest among concerned parties considering implementation of advanced modelling
of stormwater pollution. The interview study was intended to compile the perspectives of
parties concerned with stormwater quality assessments in detailed development planning. It
included seven interviews. Results from the interviews showed that an array of difficulties are
experienced by the requested parties. Overall, a need for increased timeframe and budget for
consultants is required. Also, continued knowledge building and enhanced communication
between parties are needed. Furthermore, it was deemed difficult and resource-intensive to
develop general guidelines for stormwater quality in terms of discharging concentrations of
stormwater pollutants.
Beskrivning
Ämne/nyckelord
Detailed development planning , Environmental quality standards , MIKE Urban+ , StormTac Web , Stormwater modelling , Stormwater pollution , Water Framework Directive , Water management , Weser verdict