Where sewer or process emissions are discharged to rivers, various assessments may be required.  These may include

Assimilation capacity.  This relates to the capacity of the receiving water to accept nutrient loads.  Environmental Efficiency has undertaken this as part of the planning process for housing and other developments.

Q Rating, sometimes called a Fresh Water Impact Assessment.  These tests involve the analysis of macro invertebrate populations and provide a rapid and accurate assessment of ecological water quality.  Environmental Efficiency is able to undertake these assessments.

Thermal mixing.  Where the temperature of the discharge water is higher than the receiving water, a study is sometimes required to determine how the warmer water mixes with the cooler water.  Again Environmental Efficiency is able to undertake these assessments.