After some tense exchanges over a minimum balance, and with barely enough members to form a quorum, the Senate managed to approve part of a plan to direct more money to the state’s transportation needs.

House Bill 16 would allow the Legislative Budget Board to set a minimum balance for the state’s Rainy Day Fund, and it would authorize a joint panel to look into how transportation money is being spent. The bill passed by a vote of 19-4.

Sen. Dan Patrick was one of two lawmakers who spoke against the bill.

“I do not want to see our state in the future not have a reserve fund for economic issues, which it was designed for,” Patrick said.

The Senate had approved a previous version of the bill that included a minimum balance, or floor, in the state’s Rainy Day Fund, which would cut off the redirection of money to the State Highway Fund if the balance fell below $6 billion. That amendment, by Sen. Patrick, was eventually scrapped, a move Sen. Patrick referred to as “caving.”

Sen. Robert Nichols defended the change, saying it was a conservative bill with built-in protections.

“There seems to be a misinterpretation that when we vote on this, that we’re giving power to the LBB to spend out of the Rainy Day Fund,” Nichols said. “If you continue to put money in there, and you don’t take money out, that’s your protection.”

Meanwhile, Senators still have to approve the main part of the plan. House Joint Resolution 2 is the mechanism that would split half of the money bound for the Rainy Day Fund into the State Highway Fund. If passed, it would go before voters in November 2014.