Assessing the vulnerability of coastal wastewater infrastructure to climate change

PI: Daniele Spirandelli
This research aimed, with community and agency stakeholders, to identify and map critical factors contributing to wastewater infrastructure vulnerability to a changing climate, particularly sea-level rise and extreme precipitation, and to develop a process that builds adaptive capacity into the system. Results showed groundwater inundation as a significant threat to sewer pipes, and a policy gap analysis identified discontinuities in key components of Hawaiʻi’s current onsite management program between land-use planning efforts and state siting regulations.

Collaborative investigation of hydraulic and geochemical connectivity between wastewater and land-use and the oceanic waters of Kāneʻohe Bay, Oʻahu

PI: Craig Glenn
This project examined the environmental and health risks of wastewater leakage from on-site sewage disposal systems, by assessing the hydraulic and geochemical connectivity between wastewaters and ocean waters of Kāneʻohe Bay using field studies and pioneering thermal infrared imaging mounted on unmanned aerial vehicles (UAVs). The remote sensing enabled the team to produce high-resolution maps of groundwater and wastewater leakage from local septic systems into waters of the Kahaluʻu watershed and Kānaʻohe Bay. A local-scale model was developed from sixteen months of data that will help inform remediation strategies to address wastewater leakage problems in the area.

Collaborative investigation of hydraulic and geochemical connectivity between wastewaters and other land-uses and the ocean waters of Waialua Bay, Oʻahu

PI: Craig Glenn
This project assesses the hydraulic and geochemical connectivity between on-site sewage disposal system wastewaters and the oceanic waters around the greater Waialua Bay area, Oʻahu, to help develop a more complete understanding of the environmental and health risks of wastewater leakage.

Differentiating treated and untreated wastewater contamination in a tropical coastal community using microbial community genomics

PI: Craig Nelson
There is growing concern that coastal ecosystems are threatened by sewage contamination of groundwaters. Using genomic methods, this project will examine the bacterial populations in the Keaukaha area of Hawaiʻi Island, to differentiate sources of contamination, and aid in management efforts to ameliorate sewage leakage.

Identifying hot spots of sewage pollution in Hilo, Hawaiʻi

PI: Tracy Wiegner
Hawaiʻi banned new cesspools in 2015, but groundwater contamination from the remaining 8700 cesspools in the Hilo area is a continuing concern. This work will use dye tracer studies to track cesspool outflows and use sewage indicators to establish contaminant sources to coastal groundwaters to inform future management decisions.

Marine Pollution Sampling in Hawaiʻi

This map is a compilation of sampling data gathered at a workshop hosted by Hawaiʻi Sea Grant and the Water Resources Research Center focusing on land-based pollutants on Hawaiian reefs. Each point on the map contains information about the type ...

Ola I Ka Wai Water is Life

by Lurline Wailana McGregorI ka wā kahiko (in ancient times), before western contact in Hawaiʻi, there was no such thing as private ownership of the land or water or any other natural resource that gave life to the people. Such ...

Predicting Hawaiʻi water demand under climate change

PI: Michael Roberts
This project studied how climate change may affect future water demand on Oʻahu, focusing on variations in temperature, precipitation, and prevailing climatic conditions. Results imply that microclimates play an important role in demand, with the hot and dry area households using typically 100 gallons more per day than those in cooler, wetter aras. Using water billing data cross-referenced with fine-scale weather data, a model was developed that estimates the growth of Oʻahu aquifer yields needed to satisfy possible shifts in demand (up to 50% increase) under different climate scenarios, or alternatively, the price increases necessary to limit consumption levels.

Rainwater Catchment Project

What is Rainwater Catchment? Rainwater catchment is the capture of rainwater, most commonly in barrels or tanks, for household, landscape or commercial use. With proper design, maintenance and water treatment, a rainwater catchment system can provide water that is free ...

The role of surface and groundwater inputs in driving water quality in Kāneʻohe Bay, Oʻahu

PI: Henrietta Dulai
The goal of this project was to identify submarine groundwater discharge locations and quantify groundwater and its derived nutrient flow into Kāneʻohe Bay, particularly as it varies with wet and dry seasonal cycles. The researchers found that most freshwater in nearby coral reefs derives from streams during the wet season, but during the dry season, input from groundwater increases 150%. These results have led to maps with quantification of groundwater discharge, and measurements of nutrient fluxes have identified several watershed hotspots of wastewater contamination.

Learn more about the Water Resource Sustainability.


Center for Water Resource Sustainability
2525 Correa Road, HIG 238
Honolulu, HI 96822
Phone: (808) 956-7031

Interim Director
Darren T. Lerner, Ph.D.

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