A geologic formation of rather impervious and semi-confined nature which transmits water at a very slow rate compared to an aquifer.

Icecaps and Glaciers

total water yield from a storm for a given watershed

it is one where the chance element is ignored as in the case of flood routing

the probabilistic analysis of hydrologic processes

the science of water that is concerned with the origin, circulation, distribution and properties of water of the earth.

Philippine land area

Groundwater

ph water resources- surface water

same as groundwater runoff

types of surface runoff

events under the same type of conditions or statistical properties are not changing

fusion or coalescence of water droplets as a result of their coming in contact through the action on them of air movement and gravitational pull.

the amount of water that could be evaporated and transpired if there were sufficient water available.

Saline (Oceans)

Source of rain, Tropical cyclone

the process by which precipitation reaching the earth's surface is returned to the atmosphere a vapor through 1. evaporation from wet surfaces and 2. transpiration by plants

it is a time dependent. This means that the sequence of occurrence of events or the time series is considered in its analysis

types of surface runoff

a hydrologic event is not influenced by another event

same as interflow

a westward-moving, wavelike disturbance of low atmospheric pressure embedded in tropical easterly winds. affects the country from April to May

a deterministic process is one in which a definite law of certainty exists

lakes

low flow, dependable flow, groundwater recharge

groundwater is confined under pressure greater than atmospheric by overlying impermeable strata. It is also known as artesian or pressure aquifer.

groundwater discharge into a stream due to deep percolation of the infiltrated water into groundwater aquifers.

rivers

average rainfall

-basic unit of hydrology -area upstream of a point along a river where all water coming off mainly from precipitation drains towards that point.

Tropical depression-max wind speed

that part of atmospheric moisture that falls on the earti surface.

ph water resources- grounwater

time for surface flow and interflow to recede, duration of flooding

this means, the output is predictable for a given input

exists when the piezometric surface lies above the ground surface.

the required time for a water particle to flow hydraulically from the most distant point in the watershed to the outlet.

used to measure the stage or depth of flow above a datum or reference level.

In very large watersheds it has prominent effects on runoff.

is one governed by chance phenomena, that is, there are so many causes at work that the influence of one cannot be readily identified

that part of surface runoff that flows over the surfaces towards stream channel.

Swamps

Distribution of Earth’s Water, Freshwater is

Tropical storm -max wind speed

same as surface runoff.

ph water resources

a geologic formation so impervious that for all practical purposes it completely obstructs the flow of groundwater (although it may itself be saturated with water).

velocity through the void spaces obtained by dividing the average velocity by the porosity

normally applies to flow over a surface

lakes

movement of water through the phreatic zone

the ability of the soil to transmit water

the pssage of water into the soil surface

a water table serves as the upper surface of the zone of saturation. It is also known as a free, phreatic or non-artesian aquifer.

source of rain, SW AND NE

describes the drainage after it reaches a defined channel

is time series independent

A geologic formation or stratum containing water in its voids or pores that may be extracted economically and used as a source of water supply.

flood warning time, watershed response, water quality

In smaller watershed it is the predominant factor affecting runoff.

Freshwater other

Ice crystals and water droplets are known to co-exist in the atmosphere at sub-freezing temperatures.This difference in pressure serves as the driving force for condensation of moisture over the crystals.

Rivers

Source of rain, ITCZ and easterly waves

representative of long term of records for the region under analysis

any hydrologic phenomenon which undergoes continuous changes with time.

that part of runoff which travels over the ground surface and through the channels to reach the basin outlet.

runoff due to the part of precipitation which infiltrates into the soil surface and moves laterally through the upper soil horizons towards streams as perched groundwater above the major groundwater level.

is one which is very sensitive to high intensity rainfall of short duration with land area of less than 250 sq. km.

use of orifice, weir, flume and other control structure, staff gage, water level recorder

magnitude of floods, design of structures such as drainage canals, flood spillways and culverts