Roof Runoff Water Quality

Convert the percentage to a decimal by dividing the percentage by 100.

Roof runoff water quality.

Rainwater running off roofs the quality of which is influenced and changed by an accumulation of roofing material and deposited materials. Journal of hydrology 466 467 115 126. Assessment of water quality of first flush roof runoff and harvested rainwater. Rainwater runoff from your roof contains a mix of materials deposited by pollution and animals as well as chemicals used in the manufacture of the shingles.

Rooftop runoff has been shown to exceed u s. Runoff water quality from vegetated roofs is an important environmental aspect in particular if vegetated roofs are combined with open storm water systems. Overall total p concentrations were higher in green roof runoff than control roof runoff. Epa drinking water standards for ph fecal coliforms aluminum al lead pb and zinc zn.

Secondary contaminants do not pose a risk to human health. Roof runoff water quality first flush roofing material potable abstract due to decreases in the availability and quality of traditional water resources harvested rainwater is increasingly used for potable and non potable purposes. Terms 1 to 17 from 17. Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout.

In this study we examined the effect of conventional roofing materials i e asphalt fiberglass shingle. Runoff from agricultural land and even our own yards can carry excess nutrients such as nitrogen and phosphorus into streams lakes and groundwater supplies. Fumes from industry and traffic. These excess nutrients have the potential to degrade water quality.

Haberland m bakacs m. All about rainwater harvesting. Roof runoff water runoff coefficient. Count the number of downspouts coming from your roof.

Aluminum zinc and ph are assigned secondarystandards which serve as guidelines to minimize offensive odor taste or aesthetic issues. In general we observed lower no3 nitrate and nh4 concentrations in green runoff than control roof runoff with the exception of runoff from the built up system which had higher no3 concentrations than the control roof runoff. Why might stormwater runoff be a problem.