TY - JOUR

T1 - Dynamization of Urban Runoff Pollution and Quantity

AU - Hornig, Sören

AU - Bauerfeld, Katrin

AU - Beier, Maike

N1 - Funding Information: Acknowledgments: We acknowledge support by the Open Access Publication Funds of Technische Universität Braunschweig. Thanks to the Stadtentwässerung Braunschweig (SE|BS), the organiza‐ tion responsible for wastewater collection and treatment in Braunschweig, and the city of Braun‐ schweig for cooperation and access to stormwater systems and background data. Thanks to Michael Aspeleiter (ISWW) and Marcel Wiedemann (ISWW) for assistance with samples analysis, and thanks to former bachelor and master students for their contributions. Funding Information: Funding: This research was funded by the Federal Ministry of Education and Research (BMBF) within the RES:Z call: Resource‐optimized city of the future; research project TransMiT—Resource‐ optimized transformation of combined and separate drainage systems in existing quarters with high population pressure, Subproject Stormwater quality, grant number 033W105B.

PY - 2022/1/29

Y1 - 2022/1/29

N2 - At present, the annual loads from long‐term series simulations are mostly used for the evaluation of rainwater management and treatment measures although the relevance of the temporal distribution of both pollution and quantity has a recognizable influence on the performance of the treatment. With the idea of dynamizing the simulation output values in relation to (i) single rainfall events, (ii) specific catchment characteristics, and (iii) the duration of the dry period between two rainfall events measurement devices and scenario studies were established in a joint research project in Lower Saxony. First measurement results of surface runoff qualities of an urban sub‐catchment in Braunschweig/Germany are presented in a high temporal definition for several pollution parameters. A correlation analysis was performed identifying additional explanatory parameters that have an influence on the first flush effect, such as rainfall characteristics or antecedent dry period. First calculations of the possible reduction in the decentralized storm water treatment by disconnecting the first flush showed values of 42–65%, depending on the pollution parameters. The comparative evaluation of the data with different statistical methods shows that the uncertainties in the calculation of rainwater pollution, or the duration of the first flush, are still very high and do not yet allow researchers to derive a pollution forecast for, e.g., a throttle control solely from the recording of the rain and area characteristics.

AB - At present, the annual loads from long‐term series simulations are mostly used for the evaluation of rainwater management and treatment measures although the relevance of the temporal distribution of both pollution and quantity has a recognizable influence on the performance of the treatment. With the idea of dynamizing the simulation output values in relation to (i) single rainfall events, (ii) specific catchment characteristics, and (iii) the duration of the dry period between two rainfall events measurement devices and scenario studies were established in a joint research project in Lower Saxony. First measurement results of surface runoff qualities of an urban sub‐catchment in Braunschweig/Germany are presented in a high temporal definition for several pollution parameters. A correlation analysis was performed identifying additional explanatory parameters that have an influence on the first flush effect, such as rainfall characteristics or antecedent dry period. First calculations of the possible reduction in the decentralized storm water treatment by disconnecting the first flush showed values of 42–65%, depending on the pollution parameters. The comparative evaluation of the data with different statistical methods shows that the uncertainties in the calculation of rainwater pollution, or the duration of the first flush, are still very high and do not yet allow researchers to derive a pollution forecast for, e.g., a throttle control solely from the recording of the rain and area characteristics.

KW - Dynamics

KW - Pollution

KW - Quality

KW - Quality-based drainage

KW - Runoff

KW - Stormwater

UR - http://www.scopus.com/inward/record.url?scp=85123938758&partnerID=8YFLogxK

U2 - 10.3390/w14030418

DO - 10.3390/w14030418

M3 - Article

VL - 14

JO - Water

JF - Water

SN - 2073-4441

IS - 3

M1 - 418

ER -