It would finish a 1-2 punch of summertime storms that began Tuesday when the remnants of former Hurricane Darby hit the Big Island and Maui before soaking O'ahu yesterday and moving westward to Kaua'i last night.

A flash-flood watch remained in effect for Kaua'i but was canceled yesterday for other islands.

The storm had lost much of its oomph by the time it reached the Islands Tuesday, but it combined with atmospheric conditions that were perfect for heavy rain, said Derek Wroe, a meteorologist with the weather service.

Rockfalls on Kalaniana'ole Highway near Makapu'u and other scattered points closed lanes for several hours yesterday, and the prospect of more landslides worried residents in neighborhoods where boulders have tumbled into homes.

Niu Valley resident Rose Fischback was sitting in her kitchen drinking coffee yesterday morning when she heard a boulder the size of an armchair crash into a fire hydrant on Anolani Street, three doors down from her home.

"I'm not sure about my choice of residential neighborhoods," said Fischback, who moved here from California six days ago. "I haven't even lived in my house yet and this happens."

More than two inches of rain fell in Nu'uanu Valley over a 12-hour period yesterday. Nu'uanu resident Patrick Onishi, whose daughter, Dara Rei, was killed when a 5-ton boulder crashed through his home in 2002, said he is worried that the rain could cause another landslide.

"Since early last evening, my son and I have taken three trips up Pacific Heights to observe the amount of water that is being diverted down the slope behind our home," Onishi said. "He was worried about the water from the heavy rains causing one of the loose boulders to come down."

• Closures: Kapolei High School was closed yesterday because it did not have electricity, the Department of Education said.

On the Big Island, Konawaena Middle School remained closed for a second day after flooding on Tuesday damaged classrooms and other facilities. Principal Shawn Suzuki said the middle school and adjacent high school have never experienced flooding this extensive.

Both schools were expected to be open today.

The Hawaii State Farm Fair was canceled for today because of heavy rains in Kapolei, organizers said. "We are on standby for Friday and we'll be watching weather conditions like the rest of O'ahu," Donna Smith of E.K. Fernandez Shows said.

• Roads: Flooding in a few chronic low-lying trouble spots — including Kamehameha Highway near Waiahole and the H-1 Freeway viaduct near 'Aiea — snarled traffic for hours. Water rose up to 3 feet on the viaduct near the Ka'onohi Street overpass.

Scott Ishikawa, state transportation department spokesman, said ponding occurred when the rainfall was heavier than highway drains could handle.

Landslides and debris briefly closed Kalaniana'ole Highway near Makapu'u Lookout, a portion of Diamond Head Road and Makiki Heights Drive near Hanahauoli School. Flooding closed Kamehameha Highway near Waiahole Valley Road until 11:40 a.m.

• Utilities: About 3,500 Hawaiian Electric Co. customers lost power at various times between 4 and 9 a.m. yesterday, but power was restored to all residents by 2:30 p.m. yesterday, spokesman Bruce Benson said.

Verizon Hawai'i reported a 50 percent increase in trouble calls, especially from Waipahu and Manoa on O'ahu and Kona on the Big Island, spokeswoman Ann Nishida said.

• Sewage: Heavy rains overwhelmed the sewer system in 'Ahuimanu yesterday morning, causing a manhole to overflow in Kane'ohe and sending an estimated 5,000 gallons of raw wastewater into Kane'ohe Stream, the city said.

The spill at 45-270 Waikalua Road began at 6 a.m. and was stopped at 6:42 a.m., city spokesman Doug Woo said. Crews will sample the stream and parts of Kane'ohe Bay for contamination, he said.