Please don't copy data from welland.ca to OpenStreetMap because the data on that site is copy right protected:

"No part of this web site, or information displayed on it, or hard copies made from it may be reproduced and/or distributed without written permission from the City. The information remains the property of the City of Welland and it's suppliers, except the Google Street ViewTM images. Users are not permitted to sell, re-license, or collect fees for this information, nor provide this information to another for commercial purposes."