HONOLULU (AP) — Honolulu officials on Thursday prepared for the possible evacuation of 10,000 people from a residential neighborhood after rains from a tropical storm dangerously elevated water levels in a reservoir.

Olivia crossed the state Wednesday, dumping heavy rains on Maui and Oahu. Meteorologists say the tropical storm is now downgraded to a tropical depression moving west away from the islands.

The city’s Board of Water Supply said Thursday the water level in Nuuanu Dam #1 is about 1.5 feet (0.5 meters) below the spillway.

The agency said it’s been siphoning excess water to keep the water below the spillway but rains outstripped its siphoning capacity.

It’s also working with the fire department to pump water out of the dam to bring levels down further.

The agency, which is the water utility for nearly 1 million people in Honolulu and surrounding towns on Oahu, said it would coordinate with the city on any evacuation notice.

Meteorologists say moisture will linger through Friday, with additional rainfall of 3 to 5 inches (8 to 13 centimeters) and isolated amounts of 6 to 8 inches (15 to 20 centimeters) on higher terrain.

That could cause life-threatening flash floods because the ground is already saturated, the Central Pacific Hurricane Center said in a statement.

The storm, which was a hurricane earlier in the week, slowly weakened as it neared the state.

President Donald Trump has signed a disaster declaration, which will help FEMA respond, Gov. David Ige said.

A couple walks in a rainstorm amid heavy traffic in Paia, Hawaii, on Tuesday, Sept. 11, 2018, as Tropical Storm Olivia marched closer to Maui. Olivia was expected to pass directly over Maui on Tuesday night into Wednesday morning. (Matthew Thayer/The News via AP)
The sun rises on the eastern shore of Oahu, Hawaii, on Wednesday, Sept. 12, 2018. Tropical Storm Olivia dropped heavy rain on Maui and the Big Island on Wednesday, and the impacts from the weakening storm were later expected on Oahu. (AP Photo/Caleb Jones)
Waves break as Tropical Storm Olivia approaches Oahu, Wednesday, Sept. 12, 2018 in Laie, Hawaii. (AP Photo/Caleb Jones)
The sun rises as Tropical Storm Olivia approaches Oahu, Wednesday, Sept. 12, 2018 near Kaaawa, Hawaii. (AP Photo/Caleb Jones)
Waves break as Tropical Storm Olivia approaches Oahu, Wednesday, Sept. 12, 2018 in Laie, Hawaii. (AP Photo/Caleb Jones)
This photo provided by the Hawaii Department of Transportation shows tree limbs that have blocked the Hana Highway near Hana on the island of Maui Wednesday, Sept. 12, 2018. (Hawaii Department of Transportation via AP)
This photo provided by the Hawaii Department of Transportation shows tree limbs that have blocked the Hana Highway near Hana on the island of Maui Wednesday, Sept. 12, 2018. (Hawaii Department of Transportation via AP)
This photo provided by Lori-Lei Rawlins-Crivello shows the rising Kaunakakai Gulch in Kaunakakai, Hawaii, on Molokai island Wednesday, Sept. 12, 2018, after Tropical Storm Olivia brought rain and wind to the island. The storm brought heavy rains to Maui and the Big Island before it was expected to move on to Oahu. (Lori-Lei Rawlins-Crivello via AP)
This photo provided by Lori-Lei Rawlins-Crivello shows the rising Kaunakakai Gulch in Kaunakakai, Hawaii, on Molokai island Wednesday, Sept. 12, 2018, after Tropical Storm Olivia brought rain and wind to the island. The storm brought heavy rains to Maui and the Big Island before it was expected to move on to Oahu. (Lori-Lei Rawlins-Crivello via AP)
This photo provided by Lori-Lei Rawlins-Crivello shows the rising Kaunakakai Gulch in Kaunakakai, Hawaii, on Molokai island Wednesday, Sept. 12, 2018, after Tropical Storm Olivia brought rain and wind to the island. The storm brought heavy rains to Maui and the Big Island before it was expected to move on to Oahu. (Lori-Lei Rawlins-Crivello via AP)
Maui County workers cleared a storm drain in Iao Valley near Kepaniwai Park on Wednesday morning, Sept. 12, 2018, in Wailuku, Hawaii. The road flooded earlier in the morning with about three feet of water according to the crew. The National Weather Service has canceled a tropical storm warning for Oahu and Maui, but says some areas will continue to get heavy rain for the next day. (Cindy Ellen Russell/Honolulu Star-Advertiser via AP)
A home on Kahekili Highway near the Waihee River Bridge, was evacuated after a flash flood breached the property on Wednesday afternoon, Sept. 12, 2018, in Maui, Hawaii. Maui County says several homes on Maui are being evacuated because of floodwaters from Tropical Storm Olivia. (Cindy Ellen Russell/Honolulu Star-Advertiser via AP)
This Wednesday, Sept. 12, 2018, photo shows waterfalls flowing into Iao Valley on Mauna Kahalawai in Hawaii. (Aaron Najera via AP)
This Wednesday Sept. 12, 2018, photo shows floodwater in the parking lot of a condo complex at Kahana Village in Lahaina, Hawaii. Heavy rain and winds from a tropical storm downed trees, knocked out power and prompted evacuations of several homes on Hawaii’s Maui island. (Lauren Greer via AP)

Source: AP

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