The River Welland could be reached by a canal from Stamford at the time .
The plans also included a link from the River Welland near Market Deeping northwards to the South Forty - Foot Drain , from where Boston could be reached .
The River Welland could be reached by a canal from Stamford at the time , and the plans also included a link from the Welland near Market Deeping northwards to the South Forty - Foot Drain , from where Boston could be reached .