Sunday’s Windward sewer spills update
News Release from City and County of Honolulu, February 21, 2018
KAPOLEI – On Sunday, the Department of Environmental Services (ENV) responded to multiple heavy rain-induced sewer spills in Windward O‘ahu. Below are the final start/stop times of the events with updated volumes, along with the amounts recovered by ENV crews.
Location Start Time/Stop Time Est. Volume in Gallons [Recovered]
- Āhuimanu Pretreatment Facility 2 p.m. (2/18)/12:05 a.m. (2/19) 2.18 million
- Kāne‘ohe Pretreatment Facility 2 p.m. (2/18)/12:20 a.m. (2/19) 6.5 million
- 45-1072 Grote Road 2:36 p.m. / 3:05 p.m. (2/18) 1,200
- 137 Popoia Road 6:09 p.m. (2/18)/1:06 a.m. (2/19) 63,765 [6,750]
- 431C Kawailoa Road 5:35 p.m. (2/18)/ 1:06 a.m. (2/19) 21,065 [21,065]
- 425C Kawailoa Road 7:45 p.m. (2/18)/ 1:06 a.m. (2/19) 14,565 [14,565]
The Āhuimanu Pretreatment Facility experiences an average daily sewer flow of 0.76 million gallons per day (mgd), but during the weekend storm received flows totaling 2.7 million gallons to 2.9 million gallons.
Meanwhile, the Kāne‘ohe Pretreatment Facility sees average daily sewer flows of 6.4 million gallons per day, but during the weekend storm received flows totaling 25.6 million gallons to 27.9 million gallons. A substantial amount of storm water is included in the spill amounts listed above, and ENV reminds residents and businesses not to divert rainwater into the city’s sewer system.
The storm event that began Saturday evening, February 17, and lasted through much of the day on Sunday, February 18, produced the following rainfall amounts, according to the National Weather Service (8 p.m. Saturday to 8 p.m. Sunday):
- Āhuimanu 11.97 inches
- Luluku (Kāne‘ohe area at Hoomaluhia) 8.37 inches
- Waiāhole 14.26 inches
- Hakipu‘u (Kualoa area) 12.85 inches
* * * * *
Heavy rains cause multiple sewer spills in Windward
News Release from City and County of Honolulu, February 18, 2018
KAPOLEI – The Department of Environmental Services (ENV) responded Sunday to multiple heavy rain-caused sewer spills on Windward Oahu.
Where Start/Result Est. Volume (Gallons)
Ahuimanu Pretreatment Facility 2 pm/on-going 5,000-plus
Kaneohe Pretreatment Facility 2 pm/on-going 10,000-plus
45-1072 Grote Road 2:36 pm/3:05 pm 1,200
137 Popoia Road 6:45 pm/on-going 30,000-plus
425C Kawailoa Road 7:10 pm/on-going 7,750-plus
The state Department of Health (DOH) was notified. Crews will place warning signs beginning Monday morning. Water samples will be taken only for the Popoia Road spill. All other locations were waived by DOH.
ENV will update spill volumes for on-going spills when spills are contained and data is processed.