gravity flow
41environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
42Pallet racking — Selective Pallet Rack Very Narrow Aisle pallet racks. Picture taken from a …
43Flush toilet — A flush toilet or Water Closet (WC) is a toilet that disposes of human waste by using water to flush it through a drainpipe to another location. Flushing mechanisms are found more often on western toilets (used in the sitting position), but many… …
44Hydronics — is the name for the use of water as the heat transfer medium in heating and cooling systems. Some of the oldest and most common examples are steam and hot water radiators. In large scale commercial buildings such as high rise and campus… …
45Gender of connectors and fasteners — A male threaded pipe, left, and female threaded elbow. In electrical and mechanical trades and manufacturing, each half of a pair of mating connectors or fasteners is conventionally assigned the designation male or female. The female connector is …
46Pallet rack — Pallet rack, also referred to as “pallet racking,” is a material handling storage aid system designed to store materials on pallets (or “skids”). Although there are many varieties of pallet rack, all types allow for the storage of palletized… …
47Agriculture in Sudan — In the early 1990s, agriculture and livestock raising were the main sources of livelihood in Sudan for about 61 percent of the working population. cite web|url=http://lcweb2.loc.gov/cgi bin/query/D?cstdy:4:./temp/ frd htX5::|title=Agriculture,… …
48Column chromatography — A chemist in the 1950s using column chromatography. The Erlenmeyer receptacles are on the floor. Column chromatography in chemistry is a method used to purify individual chemical compounds from mixtures of compounds. It is often used for… …
49Water tower — A water tower, watershed, or elevated water tower is a large elevated water storage container. The term tower speaks to its elevation and is constructed for the purpose of holding a supply of water at a height sufficient to pressurize a water… …
50irrigation and drainage — ▪ agriculture Introduction artificial application of water to land and artificial removal of excess water from land, respectively. Some land requires irrigation or drainage before it is possible to use it for any agricultural production; other… …
