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44 Cards in this Set
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What is drainage |
Flow of water through well defined channels |
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What is a drainage system |
Am integrated network of well defined water channels |
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A drainage system is also called a |
River system |
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A river system includes |
A river and it's tributaries |
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What is a catchment area |
A specific area of land drained by a river |
Catchment area is an umbrella term |
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What is a Drainage basin |
An area drained by a single river system |
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What is a river basin |
The catchment area of large rivers |
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What is a watershed |
The catchment area of small rivers |
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What are water divides |
They are hills and ridges that separate the adjacent watersheds or river basins or drainage basins |
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Example of water divides |
Sahyadris |
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What is the world's largest drainage basin |
Amazon basin |
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What is India's largest drainage basin |
Ganga drainage basin |
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The Ganga drainage basin occupies how much of India's land mass |
26% |
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Ganga drainage basin is in how many states |
11 states |
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Ganga drainage basin is in which states |
Himachal Pradesh Uttarakhand Haryana Rajasthan Uttar Pradesh Madhya Pradesh Bihar Chhattisgarh Jharkhand West Bengal Delhi |
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Ganga drainage basin is in how many countries and name them |
3 Nepal India Bangladesh |
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Why a river basin/watershed is often considered as a unit of planning for micro/macro level development |
1. The events like floods,droughts etc. occurring in one area of the unit affect other parts as well 2. The data about land and water characteristics is measurable and comparable |
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What are the categories of Indian river basins based on size of the catchment area |
Major Medium Minor |
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A major river basin has a catchment area of |
Equal to or more than 20,000 sq. Km |
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A medium river basin has a catchment area of |
2000-20,000 sq. Km |
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A minor river basin has a catchment area of |
Less than 2000 sq. Km |
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Categories of Indian river basins in descending order based on the number of basins belonging to that category |
Minor (55) > medium (45) > major (13) |
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What is a drainage pattern |
Design formed by spatial arrangement of river and it's tributaries in terms of geometrical shapes |
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What are the factors responsible for a particular type of drainage pattern - 6 |
Slope of the land Underlying Rock structure Geological time period Climate of the area Amount of water flowing Periodicity of flow |
SLUG CAP |
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What are the types of drainage patterns |
Dendritic Radial Rectangular Trellis Centripetal |
Neuro radiology's rectangular trolley with flowers |
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What is the most common drainage pattern |
Dendritic |
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Appearance of dendritic pattern of drainage |
Looks like tree and its branches |
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Dendritic pattern of drainage develops due to |
Uniform Rock structure with insignificant faults and joints |
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Examples of dendritic pattern of drainage |
Ganga Godavari |
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What is radial drainage pattern |
Rivers flows centrifugally from a hill |
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A radial drainage pattern occurs because |
A river flows in different directions from central peak or dome like structure |
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Examples of radial drainage pattern |
Rivers originating from Amarkantak range |
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What is rectangular drainage pattern |
Rivers flows at right angles |
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Rectangular drainage pattern occur due to |
Strongly jointed Rocky terrain, which usually occurs in peninsular India where rivers flow in faults and fractures of rocks |
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What is Trellis drainage pattern |
Primary tributaries flow parallel to each other and secondary tributaries join them at right angles |
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Trellis drainage pattern occurs when |
Secondary tributaries flow in valleys cut in less resistant Rock and primary tributaries flow from ridges of resistant Rock |
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Trellis pattern occurs in which areas |
They develop in areas of alternating weak and resistant bedrock |
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Examples of trellis drainage pattern |
Drainage in Himalayan mountains |
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What is centripetal drainage system |
Rivers discharge their waters from all directions in a lake or a depression |
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Which areas do have centripetal drainage pattern |
Thar desert |
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Drainage system is broadly divided into what many types |
Sequent Insequent |
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Drainage system is divided into sequent and insequent types based on |
Original and development of streams through time |
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What is sequent drainage system |
It is the system which follows the regional slope and geological structure of an area |
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Sequent drainage system can be divided into what types |
Consequent Subsequent ObsequentResequent ObsequentResequent Resequent |
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