In an enclave of a city known as the Venice of America, where dream-big houses look out over a maze of picturesque canals, the comparison to the Venice of Italy no longer seems so appealing. On Monday morning, shortly after November’s so-called supermoon dropped from view on Mola Avenue, it was easy to see why. The tide swelled on command. Seawater gurgled audibly up through manhole covers and seeped from the grass. Under a sunny sky, the water drowned docks and slid over low sea walls. By 8:15 a.m., peak tide, this street in the Las Olas Isles neighborhood was inundated, just like the Venice across the pond.