The Owabi reservoir is the second major source of drinking water for the Kumasi Metropolis and its surrounding communities. About 20% of the water supplied to the metropolis is derived from the reservoir, serving mainly the northern part of Kumasi. The reservoir’s tributaries flow through some urban areas, as well as some farming communities. Its major tributaries are Owabi, Sukobri, Atafua, Akyeampomene, Pumpunase and Afu. These rivers carry waste from human activities such as car repair works, washing bays and refuse dumps.

The Owabi River, the main tributary of the reservoir, is infested with bloodworms. This reduces the water quality of the reservoir as it flows into it. Agrochemicals and fertilizers used by farmers within the catchment of the reservoir are sources of pollution to the reservoir. Studies of heavy metals and nutrient concentrations in the reservoir have been reported. Algae bloom is observed in the dry season and high turbidity in the rainy season, which tends to increase the cost of water treatment.

The state of the reservoir at present poses a threat to water resource management. The tributaries may filter naturally as they flow into the reservoir; however, this may not be enough to reduce the extent of pollution significantly.

Choose the correct answer: Which of the following worms have infested the main tributary for the Owabi dam?

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