Imaginary example for Dam Y:

 

 

Are current and future nutrient loads under sufficient control in order to meet the target level for this water-body?

 

 

W

P

H

?

Your assessment of the situation

 

Uncertainty of this assessment

 

 

Assessment through site inspection

X

 

 

 

¾ of the catchment is used for forestry, with some game-keeping, hunting, lumbering with the latter causing fairly intensive erosion locally

¼ is pasture, extensively used with limited heads of stock per hectare; small settlement of about 30 dwellings (using septic tanks or latrines), incl. stables for up to 100 heads of stock. This is about 0.5 km away from the next brook; presumably no direct surface run-off

No modelling of catchment loading was undertaken, but as long as the size of the human population, stock density and forestry activities do not increase, this is not deemed necessary, as the very good status of the reservoir indicates loading to be below critical limits. Socio-economic considerations indicate further reduction rather than increase of land use (depopulation of the region).

Should this change contrary to expectation, i.e. population grow or land use intensify, loads should be determined before granting such activities.

 

Assessment through modelling loads

 

 

 

X

No modelling done

W = well under control
P = partially under control
N = not sufficiently controlled
? = no information

 

Back to è Assessing the risk of cyanobacterial proliferation