Perhaps piling technology and flood protection technology has advanced significantly since then and it's worth looking again at this as an option
If the main problem was the embankments, it is possivle to use earth reinforced walls, wich place matting all through the embankment to tie the facing blocks in to hold up the soil. They are cheap to design and build and do not need specilist contractors. Also as they come as small light compounents (other than the matting which can just be long), no need for large and heavey concrete mixers to be moved around the site (which can be a big and costy problem on marshy sites).