Roof Runoff Water Quality

Assessment of water quality of first flush roof runoff and harvested rainwater.

Roof runoff water quality.

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. Determine the percentage of water collected from each downspout p. Convert the percentage to a decimal by dividing the percentage by 100. 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.

Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. All about rainwater harvesting. This publication discusses the presence of various pollutants in rooftop runoff and establishes some general guidelines regarding the use of collected rainwater in north carolina. 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.

Roof runoff water runoff coefficient. Runoff water quality from vegetated roofs is an important environmental aspect in particular if vegetated roofs are combined with open storm water systems. Fumes from industry and traffic. Journal of hydrology 466 467 115 126.

Runoff from agricultural land and even our own yards can carry excess nutrients such as nitrogen and phosphorus into streams lakes and groundwater supplies. 2013 an investigation of the water quality of rainwater harvesting systems. Count the number of downspouts coming from your roof. In this study we examined the effect of conventional roofing materials i e asphalt fiberglass shingle.

Secondary contaminants do not pose a risk to human health. Haberland m bakacs m. These excess nutrients have the potential to degrade water quality. Aluminum zinc and ph are assigned secondarystandards which serve as guidelines to minimize offensive odor taste or aesthetic issues.

Why might stormwater runoff be a problem. Terms 1 to 17 from 17. Rainwater running off roofs the quality of which is influenced and changed by an accumulation of roofing material and deposited materials.