|Basic Concepts in Environment, Agriculture and Natural Resources Management: An Information Kit (International Institute for Rural Reconstruction (IIRR))|
|Freshwater and marine ecosystems|
Upwelling and flowing groundwater that usually drains into a catchement area called brooks, e. g., Los Baños hot springs; Tiwi Hot Springs; Hidden Valley (Alaminos, Laguna); natural springs
A body of water naturally/artificially impounded for sustainable domestic/fishery, agricultural, industrial uses, e.g.,Angat Dam; Ambuklao Dam and Sta. Mesa Filtering Plant; other fish ponds.
Statistics: 59 dams and reservoirs with a total of about 33,000 hectares.
Confined static bodies of water where streams and river flow.
Example: Laguna Lake; Taal Lake; Lake Naujan.
Statistics: 70 lakes with a total of 200,000 hectares.
Areas of shallow and stagnant water in which conditions are domminated by closely-packed vegetation, often emergent such as trees, palm and weeds.
Example: Candaba Swamp