**3. Case application**

This section illustrates the potential ecological risk index by using a case study. The data for the ERI values is taken from [11]. The main steps for creating a potential ecological risk index to assess the Liaohe River system are:


**Figure 2.** *The location of sampling sites along the Liaohe River protected area [11].*

*Water Quality Ecological Risk Assessment with Sedimentological Approach DOI: http://dx.doi.org/10.5772/intechopen.88594*
