1. Low-Impact Development
mimics the natural hydrology that existed before development occurred.

2. Three types of Green Roofs
Intensive Green Roofs
Extensive Green Roofs
Semi-intensive Green Roofs

3. Permeable (or porous) Pavement
Is pavement that allows for the vertical passage of water.
Example of Permeable (Porous) Pavement
Grass
Gravel or crushed stone
Grid
Paver stones
Porous concrete or asphalt

4. Groundwater Contaminants
It is originate from a wide variety of natural and anthropogenic sources.
Nonaqueous phase liquids (NAPLs)
specialized class of organic contaminants that do not mix readily with water.

5. CHAPTER 10: WATER TREATMENT
Introduction
Water Treatment
the purpose of water treatment is to provide potable water that is palatable.
Potable Water
refers to water that is healthy for human
Palatable Water
describes water that is aesthetically acceptable to drink or free from turbidity, color, odor, and objectionable taste.