How Venice's buildings have stood for centuries on millions of wooden piles

Venice (Image Credit: Canva)We imagine walking on water, how would it feel? How would it feel to have water instead of a solid ground below your house? While Kashmiri houseboats and Maldivian water cottages can provide you a preview, an entire centuries old city still seems unimaginable. The renowned city of Venice has actually survived on water with innovative upside down forest design. The city is a unique experience where the streets are waterways, boats replace buses, and centuries-old palaces seem to rise straight out of the sea. The city has been a source of curiosity for travellers, architects, engineers, archeologists among others. And, studies on the floating city have revealed interesting facts.A city built where land meets waterBefore being intricately planned, Venice developed across more than a hundred small islands in the Venetian Lagoon. These consisted of shallow waters, mudflats and marshy ground with connection to the Adriatic Sea. Located in northeastern Italy, the lagoon actually proved to be a safe haven against the invading forces of the time. The arrangement worked for temporary refuge but the people wanted to extend their imagination to build a permanent settlement. However the challenge was that how could anyone construct sturdy homes, churches and palaces on ground that seemed barely capable of supporting them?(Image taken from piecesofvenice.com)This challenge was overcome by using the landscape to the advantage of engineering innovation. The builders discovered that the soft lagoon soil can be strengthened by driving wooden poles deep into the ground, packing them closely together and creating a firm platform on which to build. Over generations, this technique transformed an apparently unsuitable stretch of marshland into one of Europe's most extraordinary historic cities.The forest beneath the streetsUnexplored is the story behind the forest that lies below the streets and palaces of Venice. The foundations beneath Venice were made using timber from trees such as alder, oak, larch, pine and elm. Workers known as battipali hammered these poles into the ground by hand, sometimes singing rhythmic songs to coordinate their labour. There were ancient songs in praise of Venice, its republican glory, its Catholic faith, and declare death to the enemy of the time, the Turks. Even today a Venetian expression na testa da bater pai (literally 'a head that is good to pound down the piles') is used even today to say that someone is dull or slow-witted.Venice (Image credit: Canva)Even the scale of the operation is surprising. The foundations of the Rialto Bridge alone contain approximately 14,000 tightly packed wooden poles, while around 10,000 oak trees support the Basilica of San Marco. The construction process was remarkably precise. Workers drove wooden piles deep into the lagoon bed until they could go no further, starting from the outer edges and gradually moving towards the centre. These poles were usually arranged in a spiral pattern, with approximately nine piles packed into every square metre. Once firmly in place, their tops were cut to create an even surface below sea level. Thick wooden zatteroni (boards) or madieri (beams) were then laid across them, forming a sturdy base for the stone structures above. Oak was later used exclusively for ship building which eventually made it too precious to bury in the mud.Why doesn’t the wood simply rot?Normally, wood exposed to moisture eventually deteriorates. So how have these foundations survived for hundreds of years? The unusual conditions that have sustained beneath the city are to be credited for this wonder. The oxygen is scarce underneath where the wooden piles remain submerged in waterlogged soil. This limits the activity of fungi and other organisms that would otherwise break down the timber much more quickly. The wood does not become immortal, however, bacteria can still cause deterioration.Moreover, water intrudes in spaces within the wood where bacterial activity has damaged the wooden structures. This also helps the timber in retaining its shape. Meanwhile, the historically placed compact soil and tightly arranged piles continue to support the buildings.Venice's wooden foundations are not indestructible. Some structures have even gradually settled over the centuries. The city now faces newer challenges associated with flooding, rising sea levels and the preservation of its historic architecture. Yet its foundations remain an inspirational reflection of how much ancient builders achieved with the materials available to them.