In a large pot, heat the olive oil. Add the pancetta and cook over moderate heat until the fat has rendered, about 4 minutes. Add the garlic, celery, carrots and onion and cook over moderate heat, stirring occasionally, until softened, about 7 minutes. Add the water, beans, tomatoes, bay leaf and cheese rind, cover and bring to a boil. Reduce the heat to low and simmer until the beans are tender, about 1 hour.