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Ala Wai Canal

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Ala Wai Canal Sewage Issue
Elisa R. Lewis
SCI/256 People, Science, and the Environment
April 10, 2013
Travis Atwood

Ala Wai Canal Sewage Issue
Untreated raw sewage released into the Ala Wai Canal can cause direct and indirect oxygen depletion, algae blooms, and disease-causing pathogenic bacteria and viruses. Human waste contains a high concentration of nitrogen and phosphorus. Phosphorus causes increased algae in freshwater and nitrogen causes increased algae in marine waters. When these nutrients are introduced to an aquatic system is causes rapid growth of algae which depletes the oxygen in the water that the invertebrates and fish need to live. In addition, species that depend on algae for food suffer because of the high concentration of these extra chemicals. Another issue from the introduction of raw sewage into the ecosystem is the carbon material from plants and animals is decomposed by the bacteria. The biological oxygen demand in water is reduced by the bacteria thus leaving fish and other organisms with a lack of oxygen once again. Hormone disrupters have also been found in sewage waste. The disrupters upset the fishery ecosystem by causing the male fish to produce immature eggs which affect the health of humans that consume the fish. Humans can also become ill from eating shellfish from the contaminated water (McGowan, 2011). One of Oahu’s largest tourist attractions is currently facing the possibilities of these types of contamination.
As a result of the heavy usage of the canal over the years and several weeks of constant heavy rain the Beach Walk Wastewater Pump Station Force Main pipe has ruptured. Because of the ruptured pipe, city officials are planning to redirect 48 million gallons of raw sewage into the Ala Wai Canal over a five-day. The canal serves the Makiki, Moanoa-Pololo, Ala Moana, Mo’ili’ili, Kapahulu, and Waikiki

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