delineation of san roque dam
CHAPTER I
INTRODUCTION
WATERSHEDS A watershed is a basin-like landform defined by highpoints and ridgelines that descend into lower elevations and stream valleys. A watershed carries water "shed" from the land after rain falls and snow melts. Drop by drop, water is channeled into soils, groundwater, creeks, and streams, making its way to larger rivers and eventually the sea. Water is a universal solvent, affected by all that it comes in contact with: the land it traverses, and the soils through which it travels. The important thing about watersheds is: what we do on the land affects water quality for all communities living downstream. A watershed is also an area of land that drains rain water or snow into one location such as a stream, lake or wetland. These water bodies supply our drinking water, water for agriculture and manufacturing, offers opportunities for recreation and are habitats to numerous plants and animals. Unfortunately various forms of pollution, including runoff and erosion, can interfere with the health of the watershed. Therefore it is important to protect the quality of our watershed.
Types of Watersheds When studying a watershed's drainage divides, there are generally three different classifications used to describe them. The first is the continental divide. Water on each side of these flows into different oceans. The second is called a major drainage divide. In this situation, waters on each side of the boundaries do not meet via the same river or stream, but they do reach the same ocean. For example, there is a drainage divide between the Yellow River (Huang He) basin and the Yangtze River in China but both have the same outlet. The final type of drainage divide is called a minor drainage divide. In these, waters separate at the divide but later rejoin. An example of this situation is shown with the Mississippi and Missouri Rivers.
IMPORTANCE AND SIGNIFICANCE OF WATERSHEDS
Why Do We Need Healthy Watersheds? Watersheds
INTRODUCTION
WATERSHEDS A watershed is a basin-like landform defined by highpoints and ridgelines that descend into lower elevations and stream valleys. A watershed carries water "shed" from the land after rain falls and snow melts. Drop by drop, water is channeled into soils, groundwater, creeks, and streams, making its way to larger rivers and eventually the sea. Water is a universal solvent, affected by all that it comes in contact with: the land it traverses, and the soils through which it travels. The important thing about watersheds is: what we do on the land affects water quality for all communities living downstream. A watershed is also an area of land that drains rain water or snow into one location such as a stream, lake or wetland. These water bodies supply our drinking water, water for agriculture and manufacturing, offers opportunities for recreation and are habitats to numerous plants and animals. Unfortunately various forms of pollution, including runoff and erosion, can interfere with the health of the watershed. Therefore it is important to protect the quality of our watershed.
Types of Watersheds When studying a watershed's drainage divides, there are generally three different classifications used to describe them. The first is the continental divide. Water on each side of these flows into different oceans. The second is called a major drainage divide. In this situation, waters on each side of the boundaries do not meet via the same river or stream, but they do reach the same ocean. For example, there is a drainage divide between the Yellow River (Huang He) basin and the Yangtze River in China but both have the same outlet. The final type of drainage divide is called a minor drainage divide. In these, waters separate at the divide but later rejoin. An example of this situation is shown with the Mississippi and Missouri Rivers.
IMPORTANCE AND SIGNIFICANCE OF WATERSHEDS
Why Do We Need Healthy Watersheds? Watersheds