Explanation:

A drainage pattern is described as concordant if it correlates to the topology and geology of the area.In other words, the pattern of drainage which arises from and closely follows the trends of the underlying strata is called concordant drainage.Concordant drainage patterns are the most commonly found drainage patterns and are classified into these types-
Consequent Rivers
The rivers which follow the general direction of slope are known as the consequent rivers.Most of the rivers of peninsular India are consequent rivers.
For example, rivers like Godavari, Krishna and Cauvery, descending from the Western Ghats and flowing into the Bay of Bengal, are some of the consequent rivers of Peninsular India.
Subsequent Rivers
A tributary stream that is eroded along an underlying belt of non-resistant rock after the main drainage pattern (Consequent River) has been established is known as a subsequent river.The Chambal, Sind, Ken, Betwa, Tons and Son meet the Yamuna and the Ganga at right angles. They are the subsequent drainage of the Ganga drainage system.These streams have generally developed after the original stream.
Obsequent Rivers
These flow in opposite direction to the master consequent.
Resequent Rivers
A resequent river flows in the same direction as that of the initial consequent stream, but which develops in response to a new base level formed due to inversion of relief.