Contents preface (VII) introduction 1—37

12.2. CLASSIFICATION OF RIVERS
Rivers can be classified as follows:
(i) Based on variation of discharge in river, as (a) Perennial rivers,

(b) Non-perennial rivers, (c) Flashy rivers, and (d) Virgin rivers.

(ii) Based on stability of river, as (a) Stable rivers,

(b) Aggrading rivers, and (c) Degrading rivers.

(iii) Based on the location of reach of river, as (a) Mountainous rivers,

(b) Rivers in flood plains, (c) Delta rivers, and

(d) Tidal rivers.

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RIVERS AND RIVER TRAINING METHODS

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(iv) Based on the plan-form of river, as (a) Straight rivers,

(b) Meandering rivers, and (c) Braided rivers.
12.2.1. Perennial Rivers
Perennial rivers obtain their water from melting snow for the larger part of any year besides getting rain water during the rainy season. Being snow-fed, perennial rivers carry significant flow all through the year.
12.2.2. Non-perennial Rivers
Non-perennial rivers are not snow-fed rivers and, hence, get completely dried up or carry insignificant flow during the summer season. They get their supplies only during the monsoon as a result of rains in their catchment areas.