I bought a house built in 1920 in Denver that never had a sump pump. There is, however, a large area of the crawl space that gathers water after storms. How is it possible this house never had a pump? Could it be this walled off area of the crawl space just contained the water and it drained out eventually? I'm wondering if I should pay a plumber the nearly $1000 to install a sump, or look for where this water might have been draining all these years.