Volume I: Part I: Section 2: Chapter 1
2.1.1
Section 2: Task A: Creation of Baseline Data Chapter 1: NERIL’S approach to the Terms of Reference UNIT OF STUDY: The unit of study for preparation of this CAT Plan is a MICRO WATERSHED (changed from beat to MWS). This unit was chosen because it was the smallest geographical unit contributing to erosion.
earth surface generated by precipitation (Rain and Snow melt) and controlled by gravitational force. Hydrological cycle define the movement of water on the earth surface.
Evaporation from sea--- Formation of clouds---Clouds generate rainfall---Rain water moves from hills towards the sea----some enter the soil--- some evaporate back to atmosphere from soil and plants---- and major part goes back to sea. The cycle continues in nature and modified by climate. In tropical and sub-tropical regions, monsoonal pattern of hydrological cycle operate—most rains occur in 3months followed by small showers, but floods and droughts are common
The reason for this choice is that it is the smallest natural unit which is affected by water and silt transport. This concept is explained in further details here under:
The rain or snow melt flows down the mountain slopes on either side of the ridge line in small streams flowing down and joining together at the bottom of the valley / gully as illustrated below.
Subject of water (H2O) is covered under the discipline of Hydrology. It has two main branches: Surface hydrology and Sub-surface hydrology (Geo-hydrology): Surface hydrology deals with water flow on
Comprehensive CAT Plan of Satluj River Basin