This fountain that was built to commemorate Tan Kim Seng's contribution towards Singapore's first public waterworks.
One of the old plaques that has some description.
The National Heritage Board's version.
I think it's easiest to read from Wikipedia. That saves typing in all the description. :-)
Tan Kim Seng also has a road named after him, Kim Seng Road, which is where a popular shopping mall, Great World City is located.