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Time focused measurements of roof runoff quality

Schriewer, A. / Horn, H. / Helmreich, B.

Runoff properties and their changes during runoff of a 14 year old zinc roof were investigated. Zinc, lead, cadmium, pH value, rain intensity and electric conductivity have been measured for a period of one year. A runoff rate of 3.73 g/m² a and a volume weighted mean zinc concentration of 4.9 mg/L were determined. First flush behaviour was observed in 93% of runoff events. Low rain intensities are correlating with higher zinc concentrations in runoff, whereas the duration of antecedent dry periods could not directly be linked with initial zinc concentrations. A dependency of starting zinc concentration to antecedent dry weather could not be observed. Climatic influences like temperature, rain intensity and humidity are also affecting runoff characteristics, which leads to the demand fo further detailed studies to establish reliable models for runoff properties.

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Time focused measurements of roof runoff quality

Schriewer, A. / Horn, H. / Helmreich, B.

Runoff properties and their changes during runoff of a 14 year old zinc roof were investigated. Zinc, lead, cadmium, pH value, rain intensity and electric conductivity have been measured for a period of one year. A runoff rate of 3.73 g/m² a and a volume weighted mean zinc concentration of 4.9 mg/L were determined. First flush behaviour was observed in 93% of runoff events. Low rain intensities are correlating with higher zinc concentrations in runoff, whereas the duration of antecedent dry periods could not directly be linked with initial zinc concentrations. A dependency of starting zinc concentration to antecedent dry weather could not be observed. Climatic influences like temperature, rain intensity and humidity are also affecting runoff characteristics, which leads to the demand fo further detailed studies to establish reliable models for runoff properties.

Time focused measurements of roof runoff quality

Schriewer, A. / Horn, H. / Helmreich, B.

Runoff properties and their changes during runoff of a 14 year old zinc roof were investigated. Zinc, lead, cadmium, pH value, rain intensity and electric conductivity have been measured for a period of one year. A runoff rate of 3.73 g/m² a and a volume weighted mean zinc concentration of 4.9 mg/L were determined. First flush behaviour was observed in 93% of runoff events. Low rain intensities are correlating with higher zinc concentrations in runoff, whereas the duration of antecedent dry periods could not directly be linked with initial zinc concentrations. A dependency of starting zinc concentration to antecedent dry weather could not be observed. Climatic influences like temperature, rain intensity and humidity are also affecting runoff characteristics, which leads to the demand fo further detailed studies to establish reliable models for runoff properties.

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Title:

Time focused measurements of roof runoff quality

Additional title:

Zeitverkürzte Messungen der Dachabflussqualität

Contributors:

Schriewer, A. (author) / Horn, H. (author) / Helmreich, B. (author)

Published in:

Corrosion Science ; 50 ; 384-391

Publication date:

2008

Size:

8 Seiten, 4 Bilder, 4 Tabellen, 36 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.corsci.2007.08.011

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

atmosphärische Korrosion , Kurzzeitprüfung , Bewitterungsversuch , Gebäudedach , Zink , Ablauf , Fließgeschwindigkeit , Niederschlag (Atmosphäre) , Intensitätsverteilung , Blei , Cadmium , pH-Wert , elektrische Leitfähigkeit , Zeitfaktor , Atomabsorptionsspektrometrie

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