The difference between the two is more evident in the evening when their radiation properties become more significant. The loose molecular structure of the rock allows it to radiate its stored energy, in the form of heat, more easily than the concrete or asphalt. The conglomeration of concrete and asphalt in the city only compounds to this problem. Students work in Cooperative Jigsaw Groups by Job Assignments to determine how their researched information contributes to the completion of the site development project. Imperviousness is a measurable environmental indicator.
Impervious surfaces represent a major component of the intensive land uses that generate pollutants.
National, state, and local agencies create regulations governing impervious surfaces. In doing so, agencies consider what the regulations need to be, and how the regulations need to change to meet the needs of the people and the environment. The question is why. Impervious surfaces contribute to the hydrologic changes that degrade waterways. The town's planning commision has asked several companies to submit plans for a 100-acre community recreation facility.