Which strategy is effective in reducing the amount of runoff from a project site?

The strategy of using pervious asphalt is effective in reducing the amount of runoff from a project site because it allows water to infiltrate through the porous surface and into the ground beneath. This permeability helps to reduce the volume of stormwater runoff, effectively managing rainwater on-site and promoting groundwater recharge. By allowing precipitation to seep through rather than flowing over impervious surfaces, pervious asphalt minimizes the likelihood of flooding and erosion, contributing to better overall water management.

In contrast, other strategies like concrete paving create a solid, impermeable surface that does not allow water to penetrate, thus increasing runoff. Grass turf can absorb some rainwater, but it is not as effective as pervious asphalt in managing larger volumes of water, especially in urban environments. Retaining walls can help manage site drainage to some degree but do not actively reduce runoff; instead, they can redirect it, which does not address the underlying issue of minimizing runoff generation. Therefore, pervious asphalt stands out as the most effective option for reducing site runoff.