Drivers told KHON2 the vehicle appeared to have spun around and was facing in the opposite direction of traffic.
Authorities identified the victim as Melvin Santos, 24, of Kahului.
They estimate the preliminary volume to be more than 1,000 gallons.
25 vehicles were affected from the flooding.
There is no tsunami threat to Hawaii.
Oahu residents woke up Monday morning to emergency traffic crews clearing debris from the roadways.
Lane closure schedules may change at any time without further notice. All projects are weather permitting.
HECO says that one of two 46kV lines that serves the area is out of service due to the storm.
They say to avoid the H-1 westbound in town.
Forecasters say residents on Kauai are expected to feel the effects of Darby overnight late Sunday into Monday.
Authorities say the 52-year-old is emotionally distraught.
Her resignation comes amid the release of emails showing DNC staffers favoring Hillary Clinton over Bernie Sanders.
The 65-foot commercial passenger vessel ran aground on the rocks near the Kailua-Kona Lighthouse.
Due to the many road closures along Hana Highway, Maui police are recommending that motorists stay off the road until the storm is over.
Heavy rain began falling over East Oahu in the afternoon and spread quickly across the entire island.
He was arrested in April 2016 for stealing items from a Home Depot store.
Herrig locked in a rear-naked choke at the 3-minute mark, forcing Curran to tap out.
The two sides will meet with mediators early next month.
A 4.3-magnitude earthquake was recorded at 9:16 p.m.
Tropical Storm Darby made landfall on Hawaii Island at 2 p.m.