In my book (MW) I discussed some 29 specific references of Mahabharata text that shed light on the status of river Sarasvati during Mahabharata times.
I reproduced these descriptions here:
I also showed with the above evidence of Mahabharata text that the grand Sarasvati of Rig-Veda (from snow capped mountains to the ocean) had lost its status definitely by Mahabharata times (5561 BCE), and more likely even by Ramayana times (12200 BCE).
Some researchers and also some lay-readers raised the question, in the light of above evidence, for the sources of water in river Sarasvati during Mahabharata times.
Here is my response.
(1).The fact rivers Sutlej and Yamuna had stopped feeding their waters into river Sarasvati does not mean that Sarasvati was completely cut off from water supply altogether.
(2). In addition, the monsoon became heavier sometime from 9000 BP (7000 BCE) until 4000 BP (2000 BCE). This would have led to additional supply of water into existing channel of Sarasvati.
There are numerous (too numerous to quote) studies which refer to this heavy monsoon for the above time period (7000 BCE – 2000 BCE). The monsoon became weaker, progressively during this time and there are numerous studies to corroborate the drying of Sarasvati after ~2000 BCE.
All a reader need to do is google with appropriate keywords.
River Sarasvati of Mahabharata times was not the grand Sarasvati of Rig-Veda times. On the other hand, Sarasvati of Mahabharata times was not the dry Sarasvati of times ~2000 BCE and after.
Mahabharata text mentions numerous holy sites on the bank of Sarasvati and many mythologized stories (of actual incidents of antiquity) in the context of Sarasvati existed during Mahabharata times. This refers to ancient nature of Sarasvati, even with respect to Mahabharata times (5561 BCE).