In this short book, Scott uses the Ayeyarwady River in Burma as a lens to discuss the evolution of rivers across geological time, as well as, particularly, the effect that humans have had on their path and their health. “If we consider a river to be an assemblage of life-forms dependent on the flow of water, silt, sand, clay, and gravel—all the elements that we call a river—then our conception of the entity must necessarily include all of its upstream tributaries and all of its delta distributaries. Not only are they all connected as a system of moving water and floodplains, many of the life-forms that depend on the river migrate between the many watercourses and rely on the flood pulse for their nutrition and reproduction…. The annual flood pulse is the most consequential movement of a river for all the life-forms dwelling in and around it. Whether impelled by monsoon rains, snow or glacial melt, or seasonal rains, the flood pulse represents that part of the year during which the river overflows its channel banks and inundates the adjacent floodplain. It may, year by year, vary in its amplitude, its timing, and its duration. But it is a completely natural part of the annual cycle of a river’s hydrology.”
Over the centuries, agriculture has been, arguably, the largest source of anthropogenic destruction to a river’s natural flow. “Only rich, annually renewed alluvial soils could, given the constraints of transport in the ancient world, provide the concentration of manpower and taxable, storable foodstuffs that made even modest state-making possible…. The most common form of early agriculture is known as “flood recession agriculture” (in French: cultivation decrue). It is still practiced throughout the world because it has been shown to be the most labor-saving form of agriculture…. The flood does almost all the work…. All that remains for the cultivator to do is broadcast or insert seeds in the prepared soil, giving the crop a head start on other plants…. Along with clearing the land for crops (deforestation), the second founding act of floodplain agriculture is drainage. This is, in effect, the war to exterminate mud and replace it with well-drained soil. What remains are watercourses (drainage and irrigation ditches) and arable land.”
The formation of the nation-state was an integral part in the course of river modifications. “The early state is an ecologically invasive, artificial order. Fixed-field agriculture, irrigated wet rice, and aboveground simultaneously ripening cereals all require a simplification of the landscape…. The state is constantly modifying its environment, simplifying it…. Whereas the hunter-gatherer adapts to the complex rhythms of the natural world to subsist, the early state strives to subdue this movement and complexity—to create a state-serving habitat. A state-serving habitat is one stripped down to a narrow band of domesticated crops and domesticated animals…. The key to the nexus between cereals and states lies, I believe, in the fact that only cereal grains can serve as a basis for taxation and appropriation: they grow aboveground; their yield can be assessed; they are storable, portable, and can be used as rations; and most of the crop ripens at the same time. This last characteristic is crucial, for it means that tax and tithe gatherers can appropriate all or part of the harvest.”
Scott concludes his paean to the natural wild-flowing river, “The river is a living hydrological community that helps spawn, feed, and shelter large numbers of flora and fauna, from algae to insects to dolphins. The life-sustaining watershed system, if allowed to move as it will, is more productive of life and biodiversity than virtually any other natural system. Any intervention by hard-path engineering to maximize the return from a river is likely to damage its life-giving properties, making it far less productive over the long term…. The hubris embedded in cost-benefit analyses and their cousin ecosystem services is nothing short of staggering. Given our wealth of ignorance about the environment and interspecies connections, it seems presumptuous to assume that hard-path engineers know more than the river…. Soft-path engineering has the singular advantage of intellectual modesty with respect to what we actually know about river movement and its environmental effects…. Soft-path engineering accepts variability in the river’s movement as valuable until proven otherwise. Meanders, backwaters, ephemeral wetlands, braids and channels, swamps—all anathema to hard-path engineering—are presumed by soft-path engineers to be biotically important.”
