What should be considered during risk assessment (pre-activity, on-site activity, and post activities)?
Dr. Kani, in the description of the question only you have mentioned three major stages of any EVENT. The first stage gives say the PRE - EVENT, the EVENT and POST - EVENT (with minor modification, i have written it differently) impact of a particular project or activity.
Now, if we consider any ecosystem, it can be divided into the two i.e. biotic and abiotic factors. in biotic and abiotic factors there are further classifications such as producers, consumer, decomposers etc in biotic and physical, chemical factors as a part of abiotic environment.
Before any activity is carried out, there are two most important things which has to be taken into consideration.
1. What would be the possible impacts of the particular event ?
2. How and till what extent the natural ecosystem is vulnerable to be affected by the event ?
Both of the above mentioned aspects will be varrying depending upon the activity (event) and the type and fragility of the natural ecosystem.
My suggestion would be a detailed study of both the aspects with wide range of parameters (not only the most common that are studied but also the ones which might show minor changes, as they might be important in deciding the fate of the natural ecosystem).
I would conclude suggesting an intense study of the process as well as the ecosystem for an efficient risk assessment.
Dr. Kani, Your question seems very interesting to me but very ambiguous. Firstly, i want to ask you what is 'impacting' the river ecosystem? Is it pollution, effect of logging activities, farming etc? First define that, then we can discuss assessment of the risk. The risk could be the ecological risk or health risk to the riparian community.
I also look at this question in the perspective of Environmental Impact Assessment. Is it that you intend to study the EIA of certain project or activity on the river ecosystem?
Dr. Kani, I would like you to make some clarrifications
Nice to meet you dear Clement Ogunkunle, i am interesting on ecological risk factors due to various domestic activities like, huge gathering, religious, rituals, open defecation, washing, cleaning, domestic sewage entry, industrial discharge, etc., in developing countries these things are common, especially in eastern regions, here the things seems good because believes and traditional practices. could you find something interesting for me in this regard ?
A very important factor to consider is a proper evaluation of land-use activities that affect river quality whether on a spatial scale or a temporal scale, and the degree to which these factors contribute to the deterioration of water quality.
Without this you cannot correctly trace or pin-point the source of the substance(s) constituting risk.
Another thing to ascertain is the use of the river water i.e. domestic use or agricultural use e.t.c. this will guide the risk assessment process, because it will the selection of toxicity factors and the target population at risk.
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