is the process by which the soil is removed from its natural place.
Soil erosion
a kind of terrace which consists of a series of flattened areas.
Bench terrace
the practice where legumes are plowed or incorporated into the soil.
Green manuring
method of areal rainfall estimation done by getting the weighted average.
Arithmetic method
farming practice where plowing & harrowing are done along the contour.
Contouring
an instrument to measure rainfall depth.
Rain gage
application of water in the soil to supply moisture needed for plant growth.
Irrigation
the moisture content of the soil when gravitational water has been removed.
Field capacity
the number of days between irrigation applications.
Irrigation interval
the removal of excess water.
Drainage
is an elevated section of open channel used for crossing natural depressions.
Flume
is that part of rainfall which runs off the soil as surface or subsurface flow.
Runoff
the coefficient which is the ratio of runoff over rainfall.
Runoff coefficient
a drop of water greater than 0.5 mm falling from the atmosphere.
Effective rainfall
a surveying instrument used for determining land areas in a topographic maps.
Planimeter
the elevation of water surface in a stream with reference to a certain datum.
Stage
the simplest method of determining soil erosion over a period of time.
Pin method
the advanced form of erosion.
Gully erosion
a facility for determining water consumptive use of crops in an open field.
Lysimeter
the common type of irrigation dam which resists flow of water by its weight.
Gravity dam
dam consisting of stones enclosed in cyclone wires which allows water passage.
Gabion dam
material used to cover the soil to minimize evapotranspiration.
Mulch
kind of thermometer with constriction to prevent easy return of liquid to the bulb.
Maximum thermometer
the inverse of the probability of exceedance of a certain hydrologic event.
Return period
