02-09-2004 Council Packet - Laserfiche WebLink

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4. New PeveloDment/RedeveloDmeiit Techniques Porous Bituminous Pavement Porous Bituminous Pavement is standard asphalt in which the fines have been held to a minimum, allowing water to pass through the pavement. Bieneath the pavement is a uniformly graded, clean stone bed of sufficient depth to catch and store the water as it drains through the pavement. The bottom of the stone bed is underlain with filter fabric on uncompacted soils, which allows the runoff to infiltrate into the soil. This reduces the volume of runoff and replenishes the groundwater table and stream baseflow. A similar approach can be used w'ith standard asphalt if the water is conveyed to a stone bed beneath the paving. Puious pavement systems have been operating successfully for twenty years, and are a viable technology when properly designed and constructed. Rainstore3 Rainstore 3 is a specific manufactured product that allows the storage and infdtration of stormwater beneath parking lots, playfields. etc. Because it provides 94% void space and is structurally capable of handling truck loads, it provides a substantial opportunity for stonnwater management in a limited area. This system is currently proposed for the reconstruction of Hhringliaus Field. Direct Connection of Roof Leaders to Storage/lnflltration Beds Roof areas generate significant amounts of runoff that is generally clean and sediment free. However, as this runoff runs across the land surface or in channels, it has the opportunity to scour pollutants from the land surface and to cause erosion. Direct connection of roof leaders to sub-surface storage infiltration beds is a viable solution to this source of runoff. X'egelated Roofs Vegetated Roof systems can hold and e\ aporate the first half-inch or more of runofi'and evaporate the collected water via the plant community. Alternatively, systems to collect and store the water on the roof, and then use that water to irrigate roof plaza and lawn areas, can also be implemented. A system to collect tlic water on the roof of the new Ram's Mead Building will provide irrigation water for tie lawn and trees that will be located on the plaza of the Ram's Head Building Campus Retrofit Techniques In addition to larger structural measures such as porous pavement, vegetated roots, and Rainstore s\ stems, there are other smaller techniques that will be incorporated throughout campus to interx ene in the current stonnwater system. The existing drainage system collects and conveys the stonnwater ninotT from campus immediately, however, under SaB Cahill Associates Environmental Consultants Ll