Installing a bioswale is a design technique that should be used to help prevent stormwater damage to the building and surrounding site. A bioswale is a vegetated channel that conveys stormwater runoff while filtering pollutants, reducing peak flow rates, increasing infiltration, and providing habitat. A bioswale can help prevent stormwater damage by reducing erosion, flooding, sedimentation, and contamination of waterways. The other options are not design techniques that should be used to help prevent stormwater damage to the building and surrounding site. Directing runoff into a stream is a design technique that can cause stormwater damage by increasing the volume and velocity of water entering the stream, resulting in erosion, flooding, sedimentation, and contamination of the stream. Paving the site with high Solar Reflectance Index (SRI) material is a design technique that can reduce the heat island effect by reflecting more solar radiation than conventional paving materials, but it does not prevent stormwater damage as it does not reduce runoff or improve water quality. Paving the site with impervious material is a design technique that can cause stormwater damage by preventing infiltration and increasing runoff, resulting in erosion, flooding, sedimentation, and contamination of waterways. References: LEED Green Associate Candidate Handbook, page 32; USGBC [Sustainable Sites], page 4-5.