Glossary of Environmental Science - 0-9

0-9

• 1-in-100 flood – a flood with 1 in 100 chance of occurring in any given year (used as a safety requirement for the construction industry.)
• 20/30/10 standard - 20 mg/l Biochemical Oxygen Demand (BOD), 30 mg/l Suspended Solids (SS), 10 units of E. coli: the water quality standard for greywater use in toilets, laundry and surface irrigation.
• 5Rs - (sustainability) reduce, remanufacture, reuse, recycle, recover.