This allowed for the continuous spiraling windrows of a classic mid-20th-century farm hayfield. These shrimp were so abundant that beaches were piled with windrows from their moults. Fire hydrants will have tall flags to locate them under the windrows. In windrows, concentrated planktonic organisms color the water and indicate the presence of LC. One of such observation was the adaptation of "Physalia" to windrows containing entangling "Sargassum". It may be in windrows, open or covered, or in closed containers. The windrows are then broken up and spread over the road. Although smaller machines exist for small windrows, most operations use large machines for volume production. One study suggests that such windrows lose only minor amounts of carbon, energy and nitrogen.