- land bounded by a topographic divide which intercepts, stores and directs/drains rainwater to a stream or river system down to a common outlet known as a mouth either a lake, sea, or ocean
WATERSHED
- provide water for agricultural, industrial and domestic purposes, they are essential to the socio-economic progress and economic stability of the country
WATERSHED
- refers to surface divide or top of mountains
Topographic divide
- refers to underground divide or rock formations.
phreatic
watershed provides:
- timber,
- forage,
- wildlife and also services like
- protective and aesthetic values
A watershed is composed of the following resources:
- water,
- soil,
- vegetation,
- rock,
- minerals,
- flora and fauna,
- human and improvements.
The following are the five 7 Largest basins in the Philippines
Rank Basins Region Drainage Area (ha):
- Cagayan (Cagayan Valley) 2,569,648
- Mindanao (S. Mindanao) 2,315,900
- Agusan (N. Mindanao) 1,092,100
- Pampanga (C. Luzon) 975,900
- Agno (Luzon) 595,200
- Abra (Ilocos) 512,500
- Pasig (Laguna) 467,800
Types of Streams Found in the Watershed:
- Ephemeral stream
- Intermittent stream
- Perennial stream
- Stream that has water just after rainfall
Ephemeral stream
- Stream that has water only during the rainy season
Intermittent stream
– Stream that has water all through-out the year
Perennial stream
World’s forest: ______ forest cover
30%
World’s forest: According to the U.N. FAO, ____ or about 7,665,000 ha of Philippines is forested, (FAO). Of this ____ ( 861,000 ) is classified as primary forest, the most biodiverse and carbon dense form of forest.
25.7%; 11.2%
World’s forest: Philippines had ______ ha of planted forest
352,000
- Implies the control or manipulation of watershed to carry out planned activity aimed at attaining, specific objectives.
Watershed Management
- Refers to the management of all-natural resources of a drainage basin to protect, maintain and improve water yield.
Watershed Management
- a term used to describe the process of implementing land use practices to protect and improve the quality of the water and other natural resources within a watershed by managing the use of those land and water resources in a comprehensive manner
Watershed Management
Triangular Concept of Watershed Management:
- Sustainable Yield
- Protection/Conservation
- Rehabilitation/Restoration
