From a description by the Texas Commission on Environmental Quality: "Software for Understanding Hydrologic Changes in Ecologically-Relevant Terms: IHA is a software program that assesses 67 ecologically-relevant statistics derived from daily streamflow records. For instance, IHA software can calculate the timing and maximum flow of each year’s largest flood or lowest flows, then calculates the mean and variance of these values over some period of time. Comparative analysis can then help statistically describe how these patterns have changed for a particular river or lake, due to abrupt impacts such as dam construction, or more gradual trends associated with land- and water-use changes."
http://www.nature.org/initiatives/freshwater/conservationtools/art17004.html
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