Module 1A Flashcards
science, which deals with the occurrence, distribution and disposal of water on the planet earth; it is the science which deals with the various phases of the hydrologic cycle.
Hydrology
branch of engineering that applies fluid mechanics principles to problems dealing with the collection, storage, control, transport, regulation, measurement, and use of water.
Hydraulics
Scope of Hydrology
- Maximum probable flood that may occur
- Water yield from a basin
- Ground water development
- Maximum intensity of storm and its frequency
10 Hydrologic Data
- Climatological
- Cropping pattern
- Stream-flow records
- Seasonal fluctuation of ground water table
- Hydrometeorological
- Hydrometeorological characteristics of basin
- Precipitation records
- Evaporation data
- Water quality data
- Geomorphologic studies of the basin
is the water transfer cycle, which occurs continuously in nature.
Hydrologic Cycle
7 Important Phases of Hydrologic Cycle
- Evaporation
- Evapo-transpiration or Transpiration
- Condensation
- Runoff
- Infiltration
- Precipitation
- Groundwater Flow
For every stream, a well-defined area of land intercepts the
rainfall and transports it to the stream. The area of land is called the
Catchment area, Watershed, or Drainage Basin
bent contour lines that point uphill
Swale
bent contour lines that point downhill
Ridge
transition between two ridges and two swales
Saddle
4 Steps of Watershed Delienation
- Identify peak points
- Connect each peak
- Locate the draining point.
- Find the watershed area using squares
5 Rules of Watershed Delienation
- Draw the divide perpendicular to contour lines
- Draw the divide along a ridge and across a saddle.
- Never draw the divide along or across a swale.
- Draw the divide between and parallel to two contour lines of the same elevation.
- Imagine a drop of rain, then trace the runoff path taken by the drop.
11 Watershed Reservations in the Philippines
- Magat
- Makiling-Banahaw
- Pulangi
- Pantabangan
- Buhi-Barit
- Upper Agno
- San Roque
- Angat
- Lake Lanao
- Caliraya
- Tiwi
releases 10 times more water than it receives from its own catchment area
La Mesa Reservoir
It connects the whole basic to Manila Bay through Pasig River.
Manila Subbasin
