During the telephonic conversation, Mr Kumar briefed Mr Singh about the latest situation in the state.
"The Centre is rushing additional NDRF teams to Bihar to help the ongoing rescue and relief operations in the flood affected region of the state," Mr Singh said in a tweet.
Recently, two persons died in a rain-related incident in Bihar where the Met officials have forecast heavy to very heavy rainfall in the coming days.
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.