Hydrology

Question 1

area which contributes runoff or drains water into (PAES 609: 2016)

Answer 1

Watershed

Question 2

A thermometer that has a constriction above the bulb that permits the mercury to rise in the capillary tube but does not allow it to descend the capillary tube unless the thermometer is reset (PAGASA, 2022).

Answer 2

Maximum thermometer

Question 3

The science that encompasses the occurrence, distribution, movement and properties of the waters of the earth and their relationship with the environment (USGS, 2022)

Answer 3

Hydrology

Question 4

The study of the biological, chemical, and physical features of lakes and other bodies of fresh water (Oxford Languages, 2022).

Answer 4

Limnology

Question 5

A branch of meteorology and hydrology that studies the transfer of water and energy between the land surface and the lower atmosphere (Wikipedia, 2022).

Answer 5

Hydrometeorology

Question 6

Heavy rainfall or rain that accumulates at a rate of 3 tenths of an inch (0.3 inch or about 7.5 mm.) or more, per hr.

Answer 6

Torrential rain

Question 7

Dominant form of precipitation in the Philippines.

Answer 7

Rainfall

Question 8

Kind of thermometer with pin inside its tube which does not go with the expanding liquid when temperature increases

Answer 8

Minimum thermometer

Question 9

Method of areal rainfall determination done by computing the weighted average.

Answer 9

Arithmetic method

Question 10

An instrument to measure depth of rainfall

Answer 10

Rain gage

Question 11

Part of rainfall which runs off the soil as surface or subsurface flow.

Answer 11

Runoff

Question 12

Ratio of runoff over rainfall.

Answer 12

Runoff coefficient

Question 13

The part of rainfall that is stored in the root zone and can be used by the plants (FAO, 2022). This excludes rainfall that does not reach the soil and percolation below the root zone. For grassed soil surface, it is estimated that this rainfall is greater than 0.5 mm/day.

Answer 13

Effective rainfall

Question 14

The inverse of the probability of exceedance of a certain hydrologic event.

Answer 14

Return period

Question 15

Airmass lifting process which is mountain-facilitated.

Answer 15

Orographic

Question 16

Airmass lifting process facilitated by sunlight or heating.

Answer 16

Convective

Question 17

Indicates to what depth liquid precipitation would cover a horizontal surface in an observation period if nothing could drain, evaporate or percolate from this surface

Answer 17

Precipitation depth

Question 18

The precipitation depth that corresponds to a liquid quantity of 1 liter falling into a 1 square meter of ground area.

Answer 18

Precipitation = (1 liter x 1,000,000 mm3/liter) / (1 m2 x 1,000,000 mm2/m2)
= 1 mm

Question 19

Probability of occurrence in any year of hydrologic event recurring once in 4 years.

Answer 19

Probability = (1/Return Period) x 100% = (1/4) x 100% = 25%

Question 20

What is the probability of occurrence in any year of a hydrologic event recurring every year?

Answer 20

Probability = (1/Return Period) x 100 = (1/1) x 100% = 100%