The river system exhibits temporal variation which could be attributed to the mixing process of the upper and lower reaches of the water under varying tropical climatic conditions.
[2] Studies showed the New Calabar River had been polluted by some chemical substances like lead, cadmium and chromium contaminating the surface water.
[3] This has high effect on the locales health risk due to the fact that they consume the fishes harvested from the river.
[citation needed] The inorganic anion contamination of the Unused Calabar Waterway surface water was explored.
Broken up oxygen, pH, sulfide, sulfate, alkali, and nitrite appeared no critical contrasts between their blustery and dry season levels.