Here you see the canal at the edge of our neighborhood. The water level is about 2.5 m below ground level in this part of the Flevopolder in the Netherlands.
A ship coming from our canal is just going into the lock for going to the lake behind the dike.
Nearly at the right level, the lock keeper asks money for using the lock. He uses a wooden shoe on an fishing rod as is custom for hundreds of years.
After a rise of 5.50 m. you can go to the lake. Give or take it with 40 centimeters difference by heavy rain. That means that if the dike, the lock or the water drainage is somewhere not functioning enough we have a water problem till the first floor. The rest of Almere is built on grounds still lower . In total 25% of the total area of the Netherlands lays under sea level but we are used to it. Our airport Schiphol lays 12 m below sea level and that is one of the lowest in the country.