# dug down deep in the ground and built the house's foundation on solid rock

Some cultures may not be familiar with this process of building a stable house. Alternate translation: "who worked hard and built a stable house"

# the torrent of water flowed against that house

"the fast-moving water crashed against the house" or "the river beat on the house"

# could not shake it

Possible meanings are 1) "could not cause the house to shake" or 2) "could not destroy the house."

# because it had been well built

"because the man had built it well"