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Lawn rollers are designed to even out or firm up the lawn surface, especially in climates where heaving causes the lawn to be lumpy. Heaving may result when the ground freezes and thaws many times over winter. Where this occurs, gardeners are advised to give the lawn a light rolling with a lawn roller in the spring. [3]
A check dam is a small, sometimes temporary, dam constructed across a swale, drainage ditch, or waterway to counteract erosion by reducing water flow velocity. [1] Check dams themselves are not a type of new technology; rather, they are an ancient technique dating from the second century AD. [ 2 ]
Roller gates of Mississippi River Lock and Dam No. 15, the largest roller dam in the world. Roller dams are a type of weir, or a dam that is designed to allow water to flow over the top in continuous action. They are used on rivers or other such moving bodies of water where erosion damage is undesirable, yet likely to occur.
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Rain gardens are constructed throughout the city to manage storm water and to improve the water quality of city waterways. [19] The care and tending of rain gardens is a partnership between the NYC DEP and a group of citizen volunteers called "harbor protectors". Rain gardens are inspected and cleaned at least once a week. [20]
Core lawn aerator attachment on a conventional front-tine garden tiller. A lawn aerator is a garden tool designed to create holes in the soil in order to help lawn grasses grow. [1] In compacted lawns, aeration improves soil drainage and encourages worms, microfauna and microflora which require oxygen. [2]
Irrigation techniques across the globe included canals redirecting surface water, [7] [8] groundwater pumping, and diverting water from dams. National governments led most irrigation schemes within their borders, but private investors [ 9 ] and other nations, [ 8 ] especially the United States , [ 10 ] China , [ 11 ] and European countries like ...
A roller mower, or rollermower, is a tractor-powered multi-spindled rotary mowers that have full width rollers front and rear. Most rollermowers attach to a four-wheeled tractor via the three-point linkage and are powered by the tractor's power take-off (PTO), though larger models connect three or more complete mowing decks to a separate chassis that is towed behind the tractor.