Stormwater Quality Modeling of Cross Israel Highway Runoff
The Hayarkon Springs Well Field is the major source of potable water for metropolitan Tel Aviv, Israel, supplying approximately 40% of the potable water in the nation. Concern for the potential contamination of the well field from runoff from the newly constructed Cross Israel Highway (CIH) resulted in the consideration of pavement cleaning to reduce the pollutant loading in the 2.4 kilometer section of the CIH that drained to the vicinity of the well field. The SIMplified Particulate Transport Model (SIMPTM) was used to evaluate the potential stormwater effects and the benefits of cleaning on stormwater quality.
The high efficiency cleaning method that was used on the highway is called “captive hydrology”. This cleaning technology, which is quite popular in the United Kingdom and Western Europe, involves a single vehicle that contains several high speed rotating jets that pressure wash the pavement and immediately recover and safely contain the resulting runoff and mobilized particulate material through the use of a powerful vacuum and large dirty water holding tank. Newer versions of this technology have the ability to recycle the water within the machine so the truck’s cleaning time can be maximized since frequent stops to take on clean water or dispose of dirty water are not needed.
In a classic paired basin study design, one side of the highway was periodically cleaned throughout the monitored wet weather season while the other side was not cleaned. Runoff from both traditional and partially porous pavements was monitored and evaluated. This chapter will provide an overview of the project and focus on the modeling process and its results.
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