Abstract
Abstract Water is the lifeblood of the Earth, and exposure to water through river systems sustains most of earthly life. The health of the river is dependent on various factors such as quantity, quality, and timing of flow. The spectrum of river flow variability is an ecologically crucial component in a river ecosystem. This study carried out in the Thamirabarani basin, Tamil Nadu, India, from 1984 to 2008 and in the Meenachil basin, Kerala, India, from 1980 to 2017. The analysis done using the Indicators of Hydrologic Alteration software reflects the basins' ecological distress, which plagued with quality issues, siltation, and weed proliferation. The absence of ecologically relevant low floods and large floods can be associated with the river basins' ecological degradation.
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