Hey Neel, thank you for your response. I would ask the original authors of this:

https://www.climatechange.ai/CameraReadySubmissions%202-119/5/CameraReadySubmission/main.pdf

I did a quick search and there is some information on this page.

https://ral.ucar.edu/solutions/products/camels

Apparently there is a separate paper describing the dataset in-depth:

A. J. Newman, M. P. Clark, K. Sampson, A. Wood, L. E. Hay, A. Bock, R. J. Viger, D. Blodgett, L. Brekke, J. R. Arnold, T. Hopson, and Q. Duan: Development of a large-sample watershed-scale hydrometeorological dataset for the contiguous USA: dataset characteristics and assessment of regional variability in hydrologic model performance. Hydrol. Earth Syst. Sci., 19, 209-223, doi:10.5194/hess-19-209-2015, 2015