| A | B |
|---|
| Polar molecule | A molecule that has electrically charged areas |
| Solution | A mixture that forms when one substance dissolves another |
| Evaporation | The process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous phase |
| Surface tension | The tightness across the surface of water that is caused by the polar molecules pulling on each other |
| Solvent | A substance that dissolves another substance, forming a solution |
| Ground Water | Water that fills the cracks and spaces in underground soil and rock layers |
| Potable Water | Water that is safe to drink |
| HCF | The water unit used on your water bill |
| Acre Foot | The water unit to measure the volume of reservoirs |
| Primary Standards | Water quality standards that apply to contaminants in drinking water that can have health consequences |
| Coffer dams | A temporary structure enclosing all or part of a construction area so the construction can proceed in a dry area |
| Spillway | A structure over or through which flood flows are discharged |
| Diversion tunnels | Routes water around the construction site of a dam |
| High scalers | Workers whose job was to climb down canyon walls on ropes to remove loose and weakened rocks along the canyon walls where the dam walls would join |
| Abutment | The part of a valley side (wall) against which a dam is constructed |
| Leach field | The ground area around a septic tank through which wastewater filters after leaving the septic tank |
| Sludge | Deposits of fine solids that settle out from wastewater during the treatment process |
| Pathogen | A disease causing organism |
| Primary Treatment | Grinding up of sewage and sedimentation to separate solids (sludge) from wastewater |
| Secondary Treatment | Wastewater is aerated and bacteria breakdown organic material in wastewater |
| Pesticides | Chemicals that kill pests |
| Herbicides | Chemicals that kill plants |
| Fungicides | Chemicals that kill or prevent the growth of fungus |
| Watershed | The land area that drains into a river or other body of water |
| Runoff | Water that flows over the ground surface rather than soaking into the ground |
