Ken Cook has a deal on the web where you enter some factors and he provides patterns for the time of year and the body of water. He has entered the results of many tournaments over the years. I don't have the space to tell all about it, but here is the link:

http://www.kencookoutdoors.com/index.php?option=com_content&task=view&id=38&Itemi d=45

BTW, it cost money (imagine that!)