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The Index for Coastal Eutrophication Potential (ICEP) is an indicator for the potential of riverine nutrient export to sustain new production of non-diatoms phytoplankton biomass; it is calculated by comparing the N, P and Si loading to the Redfield ratios expressing the requirements of marine diatoms growth.
A negative value of the ICEP indicates that Si is present in excess over the other nutrients and would thus indicate a low likelihood of harmful algal bloom development. Positive values of ICEP indicate an excess of N or P over Si, which may lead to blooms of non-diatom, possibly harmful algae species. The ICEP represents the potential impact of the riverine delivery to the coastal zone.
ICEP of water draining into coastal seas presented on the scale of river basins, and observed algal blooms collected from HAEDAT.