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Once completed the parking areas of Target and Costco will create nearly 25 acres of land, 50% of the development. All of which will be impermeable to rainwater. The designers took the information gathered in the geotechnical reports and LID manual to create a design that was economical and environmentally sound.
The designer solved the problem with three separate methods. One of the methods was a traditional retention pond and the other methods used emerging technologies: porous pavement and a filter cartridge system was used. All three will be discussed with regards to construction detail, stormwater mitigation, best management practices (BMP), and a summary to tie the decisions made to use one system over the other.
The magnitude of this development will create mostly impervious areas, stormwater management is a major concern. If traditional retention ponds were used the whole site would have to been raise almost 4 feet to achieve the proper pipe invert slopes to convey the water to the retention ponds. This was not economical so alternative methods were used and each will be discussed.
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