Republic of the Philippines
AURORA STATE COLLEGE OF TECHNOLOGY
DEPARTMENT OF ENGINEERING
CIVIL ENGINEERING SECTION
Zabali, Baler 3200, Aurora
A Narrative Report
Presented to the faculty of the
Department of Engineering
Mrs. Ginalyn G. Sumait
In Partial Fulfillment
of the Requirements for
HYDROLOGY
Bernardino, Onille Paul
Bihasa, Krizza Joyce A.
Dizon, Kathlene Ann
Esperanza, Renz F.
Matnog, Alfred V.
Montesa, Joey L.
Tangson, John Brian
BSCE 3A
May 12, 2021
, Republic of the Philippines
AURORA STATE COLLEGE OF TECHNOLOGY
DEPARTMENT OF ENGINEERING
CIVIL ENGINEERING SECTION
Zabali, Baler 3200, Aurora
DEFINITION OF INFILTRATION
Infiltration is the process by which water on the ground surface enters the soil.
Infiltration is governed by two forces:
• Gravity
• Capillary Action
Infiltration is also defined as a downward entry of water into the soil. The velocity at which
water enters the soil is called infiltration rate.
Infiltration Rate
• The maximum rate at which a soil in any given condition is capable of absorbing water.
, Republic of the Philippines
AURORA STATE COLLEGE OF TECHNOLOGY
DEPARTMENT OF ENGINEERING
CIVIL ENGINEERING SECTION
Zabali, Baler 3200, Aurora
Infiltration Capacity
• In soil science is a measure of the rate at which a particular soil is able to absorb rainfall or
irrigation.
DIFFERENCE BETWEEN INFILTRATION AND PERCOLATION
Infiltration- The entry of water into the soil through the soil surface
Percolation- The process of downward movement of water into
soil, once water enters into the soil.
NOTE: When Percolation Stop, Infiltration also stops.
When Infiltration Stop, Percolation is continuing.
FACTORS AFFECTING INFILTRATION
Infiltration rates vary widely. It is dependent on the condition of the land surface
(cracked, crusted, compacted, etc.), land vegetation cover, surface soil characteristics (grain size
& gradation), storm characteristics (intensity, duration &magnitudes), surface soil and water
temperature, chemical properties of water and soil.
Precipitation. The greatestfactor controlling infiltration isthe amount and characteristics(intensity,
duration, etc.) of precipitation that falls as rain or snow.
Soil Characteristics. Some soils, such as clays, absorb less water at a slower rate than
sandysoils. Soils absorbing less water result in more runoff overland into streams.
Conditions at Soil Surface. Even if the subsoil has excellent under drainage but at
the surface soil pores are sealed due to turbid water or by in wash of fine soil
particles it may prevent entry of water into the soil and infiltration rate will be low.
Soil Saturation. Like a wet sponge, soils already saturated from previous rainfall can’t absorb
much more, thus more rainfall will become surface- runoff.
AURORA STATE COLLEGE OF TECHNOLOGY
DEPARTMENT OF ENGINEERING
CIVIL ENGINEERING SECTION
Zabali, Baler 3200, Aurora
A Narrative Report
Presented to the faculty of the
Department of Engineering
Mrs. Ginalyn G. Sumait
In Partial Fulfillment
of the Requirements for
HYDROLOGY
Bernardino, Onille Paul
Bihasa, Krizza Joyce A.
Dizon, Kathlene Ann
Esperanza, Renz F.
Matnog, Alfred V.
Montesa, Joey L.
Tangson, John Brian
BSCE 3A
May 12, 2021
, Republic of the Philippines
AURORA STATE COLLEGE OF TECHNOLOGY
DEPARTMENT OF ENGINEERING
CIVIL ENGINEERING SECTION
Zabali, Baler 3200, Aurora
DEFINITION OF INFILTRATION
Infiltration is the process by which water on the ground surface enters the soil.
Infiltration is governed by two forces:
• Gravity
• Capillary Action
Infiltration is also defined as a downward entry of water into the soil. The velocity at which
water enters the soil is called infiltration rate.
Infiltration Rate
• The maximum rate at which a soil in any given condition is capable of absorbing water.
, Republic of the Philippines
AURORA STATE COLLEGE OF TECHNOLOGY
DEPARTMENT OF ENGINEERING
CIVIL ENGINEERING SECTION
Zabali, Baler 3200, Aurora
Infiltration Capacity
• In soil science is a measure of the rate at which a particular soil is able to absorb rainfall or
irrigation.
DIFFERENCE BETWEEN INFILTRATION AND PERCOLATION
Infiltration- The entry of water into the soil through the soil surface
Percolation- The process of downward movement of water into
soil, once water enters into the soil.
NOTE: When Percolation Stop, Infiltration also stops.
When Infiltration Stop, Percolation is continuing.
FACTORS AFFECTING INFILTRATION
Infiltration rates vary widely. It is dependent on the condition of the land surface
(cracked, crusted, compacted, etc.), land vegetation cover, surface soil characteristics (grain size
& gradation), storm characteristics (intensity, duration &magnitudes), surface soil and water
temperature, chemical properties of water and soil.
Precipitation. The greatestfactor controlling infiltration isthe amount and characteristics(intensity,
duration, etc.) of precipitation that falls as rain or snow.
Soil Characteristics. Some soils, such as clays, absorb less water at a slower rate than
sandysoils. Soils absorbing less water result in more runoff overland into streams.
Conditions at Soil Surface. Even if the subsoil has excellent under drainage but at
the surface soil pores are sealed due to turbid water or by in wash of fine soil
particles it may prevent entry of water into the soil and infiltration rate will be low.
Soil Saturation. Like a wet sponge, soils already saturated from previous rainfall can’t absorb
much more, thus more rainfall will become surface- runoff.
