An artifact manifested by the forces of the river, the earth, and the sky that it inhabits. Not so much defying the inevitable change of inundation, as coexisting with it. Weathering. Defining itself anew with each flood, without erasure; A palimpsest of the ecosystem, the history, and the legends that permeate this culture and region. A simple structure utilizing simple materials and building technologies, ARK 3.0 derives it's complexity from the surrounding environment; Its form fluctuating with the natural ebb and flow of flood waters.This proposal is characterized by the program requirements of explore/educate, rescue/refuge, and shelter/sustain. This triad of bimodal conditions is housed in the flood observatory/museum, flood shelter, and ecotourist hostel respectively. Each program element is suspended from, and contained within a simple shell structure. Portions of the exterior of these shells are outfitted with wind-energy harvesting vertical turbines, and serve as a growth surface for both "cultivated crops", and indigenous vegetation.Elements that must function during a flood event are held above the high water zone. The shells are disposed around a central court, and linked via circulation catwalks, which in turn are connected to the spiral garden and water-sculpture fountain. Normally water rains down from the structure above, but during inundation the flow is reversed producing a fountain that is visible from afar.ARK 3.0 employs a rigid body helium gas airship as a manifold platform in support of scientific, rescue, and leisure needs. The airship is electric, powered by its self-contained photovoltaic array. It is silent, producing no emissions, and requires only minimal ground based support; Configured here as a floating landing surface serving "dual-duty" for current rescue aircraft fleets.