[2] The CWAP has been developed to assess the impacts of land use activities on water quality and quantity. Obviously, land use impacts on private land located in the watershed above the point of interest can also have an effect on water quality and quantity. Resource development activities on private land are not regulated and the information required to answer CWAP questions is usually not available. However, if the amount of private land is significant (greater than 15% of the total sub-basin area) and it is obvious that ignoring its presence is not reasonable, the private land should be included in the ECA calculations. It may be necessary to make estimates of development based on interpretation of air photos and maps if landowners cannot be contacted.