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106-567: The surrounding drainage basin that provides water to the reservoir system covers an area of about 94 square miles (240 km), which includes most of the town of Scituate and parts of Foster , Glocester , Johnston , and Cranston . The Scituate Reservoir is operated by Providence Water Supply Board . The reservoir is formed by an earth-filled dam spanning the North Branch Pawtuxet River , about 3,200 feet (980 m) long by 100 feet (30 m) high. An aqueduct from

212-483: A dairy ) for the eventual sale of a dairy product . Dairy farming has a history that goes back to the early Neolithic era , around the seventh millennium BC, in many regions of Europe and Africa. Before the 20th century, milking was done by hand on small farms. Beginning in the early 20th century, milking was done in large scale dairy farms with innovations including rotary parlors , the milking pipeline , and automatic milking systems that were commercially developed in

318-476: A lake or ocean . A basin is separated from adjacent basins by a perimeter, the drainage divide , made up of a succession of elevated features, such as ridges and hills . A basin may consist of smaller basins that merge at river confluences , forming a hierarchical pattern . Other terms for a drainage basin are catchment area , catchment basin , drainage area , river basin , water basin , and impluvium . In North America, they are commonly called

424-484: A sink , which may be a permanent lake, a dry lake , or a point where surface water is lost underground . Drainage basins are similar but not identical to hydrologic units , which are drainage areas delineated so as to nest into a multi-level hierarchical drainage system . Hydrologic units are defined to allow multiple inlets, outlets, or sinks. In a strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins. About 48.71% of

530-414: A watershed , though in other English-speaking places, "watershed" is used only in its original sense, that of the drainage divide line. A drainage basin's boundaries are determined by watershed delineation , a common task in environmental engineering and science. In a closed drainage basin, or endorheic basin , rather than flowing to the ocean, water converges toward the interior of the basin, known as

636-556: A Water Supply Board to locate a larger water supply for the city. They found a potential source at the head of the North Branch Pawtuxet River and its two main tributaries, the Moswansicut and Ponaganset Rivers. A new Water Supply Board was appointed in 1915 with powers to enact the legislation that cleared the way for construction of the reservoir. Construction was well under way by 1921. At that time, it

742-434: A bucket on the floor. The next innovation in automatic milking was the milk pipeline, introduced in the late 20th century. This uses a permanent milk-return pipe and a second vacuum pipe that encircles the barn or milking parlor above the rows of cows, with quick-seal entry ports above each cow. By eliminating the need for the milk container, the milking device shrank in size and weight to the point where it could hang under

848-413: A city where such fresh milk supply was economically viable. Centralized dairy farming as we understand it primarily developed around villages and cities, where residents were unable to have cows of their own due to a lack of grazing land. Near the town, farmers could make some extra money on the side by having additional animals and selling the milk in town. The dairy farmers would fill barrels with milk in

954-456: A dairy cow is a cycle of pregnancy and lactation starting at puberty. The timing of these events is very important to the production capacity of the dairy. A cow will not produce milk until she has given birth to a calf. Consequently, timing of the first breeding as well as all the subsequent breeding is important for maintaining milk production levels. Most dairy producers aim for a replacement heifer to give birth to her first calf, and thus join

1060-483: A dairy farm revolves around the milking parlor. Each lactating cow will visit the parlor at least twice a day to be milked. A remarkable amount of engineering has gone into designing milking parlors and milking machines. Efficiency is crucial; every second saved while milking a single cow adds up to hours over the whole herd. Milking is now performed almost exclusively by machine, though human technicians are still essential on most facilities. The most common milking machine

1166-405: A day, in a barn with the cattle tied by the neck with ropes or held in place by stanchions . Feeding could occur simultaneously with milking in the barn, although most dairy cattle were pastured during the day between milkings. Such examples of this method of dairy farming are difficult to locate, but some are preserved as a historic site for a glimpse into the days gone by. One such instance that

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1272-515: A dedicated nutritionist who is responsible for formulating diets with animal health, milk production, and cost efficiency in mind. For maximum productivity diets must be formulated differently depending on the growth rate, milk production, and reproductive status of each animal. Cattle are classified as ruminants (suborder ruminantia belonging to the order artiodactyl ) as they are able to acquire nutrients from even low quality plant-based food, thanks mainly to their symbiotic relationship with

1378-454: A drainage basin, and there are different ways to interpret that data. In the unlikely event that the gauges are many and evenly distributed over an area of uniform precipitation, using the arithmetic mean method will give good results. In the Thiessen polygon method, the drainage basin is divided into polygons with the rain gauge in the middle of each polygon assumed to be representative for

1484-540: A drainage boundary is referred to as watershed delineation . Finding the area and extent of a drainage basin is an important step in many areas of science and engineering. Most of the water that discharges from the basin outlet originated as precipitation falling on the basin. A portion of the water that enters the groundwater system beneath the drainage basin may flow towards the outlet of another drainage basin because groundwater flow directions do not always match those of their overlying drainage network. Measurement of

1590-518: A farm level). These systems are generally limited to intensively managed systems although research continues to match them to the requirements of grazing cattle and to develop sensors to detect animal health and fertility automatically. Every time the cow enters the milking unit she is fed concentrates and her collar is scanned to record production data. Cool temperature has been the main method by which milk freshness has been extended. When windmills and well pumps were invented, one of their first uses on

1696-522: A food source and as beasts of burden, the earliest evidence of using domesticated cows for dairy production is from the seventh millennium BC – the early Neolithic era – in northwestern Anatolia. Dairy farming developed elsewhere in the world in subsequent centuries: the sixth millennium BC in eastern Europe, the fifth millennium BC in Africa, and the fourth millennium BC in Britain and Northern Europe. In

1802-434: A lighter weight. Under typical nutritional conditions, Holstein heifers will reach puberty at the age 9–10 months. Proper body condition for breeding is also largely judged by weight. At about 800lbs Holstein heifers will normally be able to carry a healthy calf and give birth with relative ease. In this way, the heifers will be able to give birth and join the milking herd before their second birthday. Puberty coincides with

1908-450: A milking technician must attach the cluster to each cow, but the machine senses when the cow has been fully milked and drops off independently. Every time a cow enters the parlor several things need to happen to ensure milk quality and cow health. First, the cow's udder must be cleaned and disinfected to prevent both milk contamination and udder infections. Then the milking technician must check each teat for signs of infection by observing

2014-469: A more extensive option where cows are turned out to graze on pasture when the weather permits. Often the diet must be supplemented with when poor pasture conditions persist. Free stall barns and open lots are intensive housing options where feed is brought to the cattle at all times of year. Free stall barns are designed to allow the cows freedom to choose when they feed, rest, drink, or stand. They can be either fully enclosed or open air barns again depending on

2120-459: A point farmers started to milk the cows in large groups, filling the barn with one-half to one-third of the herd, milking the animals, and then emptying and refilling the barn. As herd sizes continued to increase, this evolved into the more efficient milking parlor. Innovation in milking focused on mechanizing the milking parlor (known in Australia and New Zealand as the 'cowshed') to maximize

2226-480: A pregnancy. In cows, a complete estrous cycle lasts 21 days. Most commonly, dairy producers discuss the estrous cycle as beginning when the cow is receptive to breeding. This short phase lasting only about a day is also known as estrus or colloquially, heat. The cow will often exhibit several behavioral changes during this phase including increased activity and vocalizations. Most importantly, during estrus she will stand still when mounted by another cow or bull. In

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2332-517: A preset level, relieving the farmer of the duties of carefully watching over 20 or more animals being milked at the same time. In the 1980s and 1990s, robotic milking systems were developed and introduced (principally in the EU). Thousands of these systems are now in routine operation. In these systems the cow has a high degree of autonomy to choose her time of milking freely during the day (some alternatives may apply, depending on cow-traffic solution used at

2438-411: A similar fashion as a baby calf's mouth massaging the teat. When the vacuum is reapplied in the chamber the flexible rubber inflation relaxes and opens up, preparing for the next squeezing cycle. It takes the average cow three to five minutes to give her milk. Some cows are faster or slower. Slow-milking cows may take up to fifteen minutes to let down all their milk. Though milking speed is not related to

2544-451: A single calf. Pregnancy lasts an average of 280 to 285 days or a little less than 9 and one half months. After the birth of a calf the cow begins to lactate. Lactation will normally continue for as long as the cow is milked but production will steadily decline. Dairy farmers are extremely familiar with the pattern of milk production and carefully time the cow's next breeding to maximize milk production. The pattern of lactation and pregnancy

2650-409: A thickness of about three inches surrounding each pipe, and the cooling system shuts off. When the milking operation starts, only the milk agitator and the water circulation pump, which flows water across the ice and the steel walls of the tank, are needed to reduce the incoming milk to a temperature below 5 degrees. This cooling method worked well for smaller dairies, however was fairly inefficient and

2756-458: A time onto the parlor as the whole thing rotates in a circle. One milker stands near the entry to the parlor and pre-dips the teats on the udder to help prevent bacteria from entering. The next milker puts the machine on the cow to begin milking. By the time the platform has completed almost a full rotation, the cow is done milking and the unit will come off automatically. The last milker will post-dip her teats to protect them before entering back into

2862-401: A vacuum system that draws the ambient air pressure down from 15 to 21 pounds per square inch (100 to 140 kPa) of vacuum. The vacuum is also used to lift milk vertically through small diameter hoses, into the receiving can. A milk lift pump draws the milk from the receiving can through large diameter stainless steel piping, through the plate cooler, then into a refrigerated bulk tank . Milk

2968-585: Is 9.5 miles (15.3 km) long and was built in the 1970s to supplement the original aqueduct. 75% of distribution is by gravity and 25% by pumping . The system consists of 870 miles (1,400 km) of water mains . Providence 's original public water supply came from the Pawtuxet River at Pettaconsett in Cranston . The plan was approved in 1869 and the first service pipe opened on December 1, 1871. By 1910, with Providence's heavy industry growing and

3074-635: Is a constantly evolving business. Management practices change with new technology and regulations that move the industry toward increased economic and environmental sustainability . Management strategies can also loosely be divided into intensive and extensive systems. Extensive systems operate based on a low input and low output philosophy, where intensive systems adopt a high input high output philosophy. These philosophies as well as available technologies, local regulations, and environmental conditions manifest in different management of nutrition, housing, health, reproduction and waste. Most modern dairy farms divide

3180-410: Is a substantial market of people with cash to buy milk, but no cows of their own. Dairy farms were the best way to meet demand. The first milking machines were an extension of the traditional milking pail. The early milker device fit on top of a regular milk pail and sat on the floor under the cow. Following each cow being milked, the bucket would be dumped into a holding tank. These were introduced in

3286-404: Is by far one of the largest expenses for dairy producer whether it be provided by the land they graze or crops grown or purchased. Pasture based dairy producers invest much time and effort into maintaining their pastures and thus feed for their cattle. Pasture management techniques such as rotational grazing are common for dairy production. Many large dairies that deliver food to their cattle have

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3392-456: Is called a cluster milker. This milker consists of four metal cups ‍ — one per teat ‍ — each lined with rubber or silicone. The cluster is attached to both a milk collection system and a pulsating vacuum system. When the vacuum is on, it pulls air from between the outer metal cup and the liner, drawing milk out of the teat. When the vacuum turns off, it gives the teat an opportunity to refill with milk. In most milking systems,

3498-419: Is extracted from the cow's udder by flexible rubber sheaths known as liners or inflations that are surrounded by a rigid air chamber. A pulsating flow of ambient air and vacuum is applied to the inflation's air chamber during the milking process. When ambient air is allowed to enter the chamber, the vacuum inside the inflation causes the inflation to collapse around the cow's teat, squeezing the milk out of teat in

3604-441: Is open for this is at Point Reyes National Seashore . Dairy farming has been part of agriculture for thousands of years. Historically it has been one part of small, diverse farms. In the last century or so larger farms concentrating on dairy production emerged. Large scale dairy farming is only viable where either a large amount of milk is required for production of more durable dairy products such as cheese, butter, etc. or there

3710-487: Is referred to as " watershed management ". In Brazil , the National Policy of Water Resources, regulated by Act n° 9.433 of 1997, establishes the drainage basin as the territorial division of Brazilian water management. When a river basin crosses at least one political border, either a border within a nation or an international boundary, it is identified as a transboundary river . Management of such basins becomes

3816-399: Is still the primary method for bulk tank cooling today on small to medium-sized operations. Another device which has contributed significantly to milk quality is the plate heat exchanger (PHE). This device utilizes a number of specially designed stainless steel plates with small spaces between them. Milk is passed between every other set of plates with water being passed between the balance of

3922-614: Is the Dead Sea . Drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important. For example, the English crown gave the Hudson's Bay Company a monopoly on the fur trade in the entire Hudson Bay basin, an area called Rupert's Land . Bioregional political organization today includes agreements of states (e.g., international treaties and, within

4028-713: The African Great Lakes , the interiors of Australia and the Arabian Peninsula , and parts in Mexico and the Andes . Some of these, such as the Great Basin, are not single drainage basins but collections of separate, adjacent closed basins. In endorheic bodies of water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this

4134-828: The Continental Divide , northern Alaska and parts of North Dakota , South Dakota , Minnesota , and Montana in the United States, the north shore of the Scandinavian peninsula in Europe, central and northern Russia, and parts of Kazakhstan and Mongolia in Asia , which totals to about 17% of the world's land. Just over 13% of the land in the world drains to the Pacific Ocean . Its basin includes much of China, eastern and southeastern Russia, Japan,

4240-714: The Korean Peninsula , most of Indochina, Indonesia and Malaysia, the Philippines, all of the Pacific Islands , the northeast coast of Australia , and Canada and the United States west of the Continental Divide (including most of Alaska), as well as western Central America and South America west of the Andes. The Indian Ocean 's drainage basin also comprises about 13% of Earth's land. It drains

4346-769: The United States , China , and New Zealand serve as important producers, exporters, and importers of milk. Since the late 20th century, there has generally been an increase in total milk production worldwide, with around 827,884,000 tonnes of milk being produced in 2017 according to the FAO . There has been substantial concern over the amount of waste output created by dairy industries, seen through manure disposal and air pollution caused by methane gas . The industry's role in agricultural greenhouse gas emissions has also been noted to implicate environmental consequences . Various measures have been put in place in order to control

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4452-403: The groundwater . A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. Dairy farm Dairy farming is a class of agriculture for the long-term production of milk , which is processed (either on the farm or at a dairy plant, either of which may be called

4558-539: The $ 21,000,000 project the "City's Greatest" and said ".. the man to whom most of the credit for this undertaking belongs is Frank E. Winsor , the man who has been in charge of the work since 1915." The dam is known today as the Gainer Memorial Dam in honor of the mayor. The plant was one of the most technologically advanced of its day and the only one of its kind in New England . It was renovated in

4664-427: The 1940s and again in the 1960s. It has a maximum capacity of 144 million US gallons (550,000 m) of water per day. The issue of pollution of the reservoir was the primary reason for the cancellation of I-84 between Hartford and Providence in 1982. On February 21, 1982, Pilgrim Airlines Flight 458 crash-landed on the frozen reservoir due to an in-flight fire. The creation of the reservoir flooded much of

4770-623: The US, interstate compacts ) or other political entities in a particular drainage basin to manage the body or bodies of water into which it drains. Examples of such interstate compacts are the Great Lakes Commission and the Tahoe Regional Planning Agency . In hydrology , the drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle . The process of finding

4876-509: The United States, artificial insemination (AI) is a very important reproductive tool used on dairy facilities. AI, is the process by which sperm is deliberately delivered by dairy managers or veterinarians into the cow's uterus. Bulls “donate” semen at a stud farm but there is never any physical contact between the cow and the bull when using this method. This method of insemination quickly gained popularity among dairy producers for several reasons. Dairy bulls are notoriously dangerous to keep on

4982-401: The additional milk. This increase in parlor sizes has resulted in tremendous increases in milk throughput and cooling demand. Today's larger farms produce milk at a rate which direct expansion refrigeration systems on bulk milk coolers cannot cool in a timely manner. PHE's are typically utilized in this instance to rapidly cool the milk to the desired temperature (or close to it) before it reaches

5088-585: The adult herd that are in the resting period before giving birth to their next calf are called dry cows because they are not being milked. All female animals that have yet to give birth to their first calf are called heifers. Some of them will grow up to take the place of older animals in the milking herd and thus are sometimes generally referred to as the replacement herd. The others, as well as most male calves are considered surplus dairy calves and are slaughtered for meat, such as veal dairy beef, or killed on farm. Dairy cattle housing systems vary greatly throughout

5194-740: The amount of phosphorus excreted by dairy livestock . The usage of rBST has also been controversial. Dairy farming in general has been criticized by animal welfare activists due to the health issues imposed upon dairy cows through intensive animal farming . Although any mammal can produce milk, commercial dairy farms are typically one-species enterprises. In developed countries, dairy farms typically consist of high producing dairy cows . Other species used in commercial dairy farming include goats , sheep , water buffaloes , and camels . In Italy , donkey dairies are growing in popularity to produce an alternative milk source for human infants. While cattle were domesticated as early as 12,000 years ago as

5300-505: The animals into different management units depending on their age, nutritional needs, reproductive status, and milk production status. The group of cows that are currently lactating, the milking herd, is often managed most intensively to make sure their diet and environmental conditions are conducive to producing as much high quality milk as possible. On some farms the milking herd is further divided into milking strings, which are groups of animals with different nutritional needs. The segment of

5406-450: The architecture of the barn structure. Overly cold conditions, while rarely deadly for cattle, cause increases in maintenance energy requirements and thus increased feed intake and decreased milk production. During the winter months, where temperatures are low enough, dairy cattle are often kept inside barns which are warmed by their collective body heat. Feed provision is also an important feature of dairy housing. Pasture based dairies are

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5512-466: The average dairy facility. AI also makes it possible to speed the genetic improvement of the dairy herd because every dairy farmer has access to sperm from genetically superior sires. Additionally, AI has been shown to reduce spread of venereal diseases within herd that would ultimately lead to fertility problems. Many producers also find it to be more economical than keeping a bull. On the other hand, AI does require more intensive reproductive management of

5618-406: The basin, it can form tributaries that change the structure of the land. There are three different main types, which are affected by the rocks and ground underneath. Rock that is quick to erode forms dendritic patterns, and these are seen most often. The two other types of patterns that form are trellis patterns and rectangular patterns. Rain gauge data is used to measure total precipitation over

5724-411: The beginning of estrous cycles . Estrous cycles are the recurring hormonal and physiological changes that occur within the bodies of most mammalian females that lead to ovulation and the development of a suitable environment for embryonic and fetal growth. The cow is considered polyestrous , which means that she will continue to undergo regular estrous cycles until death unless the cycle is interrupted by

5830-562: The bulk milk tank. Typically, ground water is still utilized to provide some initial cooling to bring the milk to between 55 and 70 °F (13 and 21 °C). A second (and sometimes third) section of the PHE is added to remove the remaining heat with a mixture of chilled pure water and propylene glycol . These chiller systems can be made to incorporate large evaporator surface areas and high chilled water flow rates to cool high flow rates of milk. Milking machines are held in place automatically by

5936-405: The climate. The resting areas, called free stalls, are divided beds lined with anything from mattresses to sand. In the lanes between rows of stalls, the floor is often make of grooved concrete. Most barns open onto uncovered corrals, which the cattle are free to enjoy as the weather allows. Open lots are dirt lots with constructed shade structures and a concrete pad where feed is delivered. Life on

6042-800: The cow's weight; and milk production requirements, which in turn depend on the volume of milk the cow is producing. The nutritional contents of each available feed are used to formulate a diet that meets all nutritional needs in the most cost effective way. Notably, cattle must be fed a diet high in fiber to maintain a proper environment for the rumen microbes. Farmers typically grow their own forage for their cattle. Crops grown may include corn , alfalfa , timothy , wheat , oats , sorghum and clover . These plants are often processed after harvest to preserve or improve nutrient value and prevent spoiling. Corn, alfalfa, wheat, oats, and sorghum crops are often anaerobically fermented to create silage . Many crops such as alfalfa, timothy, oats, and clover are allowed to dry in

6148-493: The cow, held up only by the sucking force of the milker nipples on the cow's udder . The milk is pulled up into the milk-return pipe by the vacuum system, and then flows by gravity to the milkhouse vacuum-breaker that puts the milk in the storage tank. The pipeline system greatly reduced the physical labor of milking since the farmer no longer needed to carry around huge heavy buckets of milk from each cow. The pipeline allowed barn length to keep increasing and expanding, but after

6254-493: The creation of the Reservoir. Between 1920 and 1930, the town's population decreased by 24 percent to 2,292, the lowest number since the 1780s. 1,195 buildings were demolished, which included 375 homes, 233 barns, 7 schools, and 6 mills. The loss of 30 dairy farms limited agricultural activity in town. The Providence and Danielson Railroad , an electric railway line that carried farm produce, granite, and lumber to Providence,

6360-399: The dairymen by reducing the refrigeration load on his bulk milk cooler, and increased milk production by supplying the cows with a source of fresh warm water. Plate heat exchangers have also evolved as a result of the increase of dairy farm herd sizes in the United States. As a dairyman increases the size of his herd, he must also increase the capacity of his milking parlor in order to harvest

6466-487: The dam carries water to a nearby treatment plant, which filters the water. Two major aqueducts carry the water from the plant into the distribution system. The original 90-inch (2,300 mm) aqueduct is 4.5 miles (7.2 km) long and ends at the siphon chamber in Cranston, where it splits into a series of smaller and smaller conduits that supply the water delivery system. The other 78- and 102-inch (2,600 mm) aqueduct

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6572-430: The discharge of water from a basin may be made by a stream gauge located at the basin's outlet. Depending on the conditions of the drainage basin, as rainfall occurs some of it seeps directly into the ground. This water will either remain underground, slowly making its way downhill and eventually reaching the basin, or it will permeate deeper into the soil and consolidate into groundwater aquifers. As water flows through

6678-441: The drainage area is dependent on the soil type. Certain soil types such as sandy soils are very free-draining, and rainfall on sandy soil is likely to be absorbed by the ground. However, soils containing clay can be almost impermeable and therefore rainfall on clay soils will run off and contribute to flood volumes. After prolonged rainfall even free-draining soils can become saturated , meaning that any further rainfall will reach

6784-697: The drainage basin to the mouth, and may accumulate there, disturbing the natural mineral balance. This can cause eutrophication where plant growth is accelerated by the additional material. Because drainage basins are coherent entities in a hydrological sense, it has become common to manage water resources on the basis of individual basins. In the U.S. state of Minnesota , governmental entities that perform this function are called " watershed districts ". In New Zealand, they are called catchment boards. Comparable community groups based in Ontario, Canada, are called conservation authorities . In North America, this function

6890-413: The early 1990s. Milk preservation methods have improved starting with the arrival of refrigeration technology in the late 19th century, which included direct expansion refrigeration and the plate heat exchanger. These cooling methods allowed dairy farms to preserve milk by reducing spoiling due to bacterial growth and humidity . Worldwide, leading dairy industries in many countries including India ,

6996-459: The early 20th century. This developed into the Surge hanging milker. Prior to milking a cow, a large wide leather strap called a surcingle was put around the cow, across the cow's lower back. The milker device and collection tank hung underneath the cow from the strap. This innovation allowed the cow to move around naturally during the milking process rather than having to stand perfectly still over

7102-857: The eastern coast of Africa, the coasts of the Red Sea and the Persian Gulf , the Indian subcontinent , Burma, and most parts of Australia . The five largest river basins (by area), from largest to smallest, are those of the Amazon (7 million km ), the Congo (4 million km ), the Nile (3.4 million km ), the Mississippi (3.22 million km ), and the Río de la Plata (3.17 million km ). The three rivers that drain

7208-411: The family built an opulent rural estate on Field Hill . The Knight family, while selling their property, set fire to their house as they were reluctant to leave. A few residents even committed suicide. Drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth , or flows into another body of water , such as

7314-411: The farm, besides providing water for animals themselves, was for cooling milk, to extend its storage life, until it would be transported to the town market . The naturally cold underground water would be continuously pumped into a cooling tub or vat. Tall, ten-gallon metal containers filled with freshly obtained milk, which is naturally warm, were placed in this cooling bath. This method of milk cooling

7420-713: The field after cutting before being baled into hay . To increase the energy density of their diet, cattle are commonly fed cereal grains. In many areas of the world, dairy rations also commonly include byproducts from other agricultural sectors. For example, in California cattle are commonly fed almond hulls and cotton seed. Feeding of byproducts can reduce the environmental impact of other agricultural sectors by keeping these materials out of landfills. To meet all of their nutritional requirements cows must eat their entire ration. Unfortunately, much like humans, cattle have their favorite foods. To keep cattle from selectively eating

7526-401: The first stream of milk. During this processes, called stripping the teat, the milking technician is looking for any discoloration or chunkiness that would indicate mastitis , an infection in the cow's mammary gland . Milk from a cow with mastitis cannot enter the human milk supply, thus farmers must be careful that infected milk does not mix with the milk from healthy cows and that the cow gets

7632-583: The greatest portion of western Sub-Saharan Africa , as well as Western Sahara and part of Morocco . The two major mediterranean seas of the world also flow to the Atlantic. The Caribbean Sea and Gulf of Mexico basin includes most of the U.S. interior between the Appalachian and Rocky Mountains , a small part of the Canadian provinces of Alberta and Saskatchewan , eastern Central America ,

7738-435: The ground and along rivers it can pick up nutrients , sediment , and pollutants . With the water, they are transported towards the outlet of the basin, and can affect the ecological processes along the way as well as in the receiving water body . Modern use of artificial fertilizers , containing nitrogen (as nitrates ), phosphorus , and potassium , has affected the mouths of drainage basins. The minerals are carried by

7844-781: The ground at its terminus, the area can go by several names, such playa, salt flat, dry lake , or alkali sink . The largest endorheic basins are in Central Asia , including the Caspian Sea , the Aral Sea , and numerous smaller lakes. Other endorheic regions include the Great Basin in the United States, much of the Sahara Desert , the drainage basin of the Okavango River ( Kalahari Basin ), highlands near

7950-463: The herd as well as more time and expertise. Detection of estrus , becomes reliant on observation in the absence of bulls. It takes considerable expertise to properly inseminate a cow and high quality sperm is valuable. Ultimately, because dairy production was already a management intensive industry the disadvantages are dwarfed by the advantages of the AI for many dairy producers. The majority of cows carry

8056-639: The islands of the Caribbean and the Gulf, and a small part of northern South America. The Mediterranean Sea basin, with the Black Sea , includes much of North Africa , east-central Africa (through the Nile River ), Southern , Central, and Eastern Europe , Turkey , and the coastal areas of Israel , Lebanon , and Syria . The Arctic Ocean drains most of Western Canada and Northern Canada east of

8162-420: The last century or so larger farms specialising in dairy alone have emerged. Large scale dairy farming is only viable where either a large amount of milk is required for production of more durable dairy products such as cheese , butter, etc. or there is a substantial market of people with money to buy milk, but no cows of their own. In the 1800s von Thünen argued that there was about a 100-mile radius surrounding

8268-420: The microbes that ferment it in a chamber of their stomachs called the rumen . The rumen is a literal micro-ecosystem within each dairy cow. For optimal digestion, the environment of the rumen must be ideal for the microbes. In this way, the job of a ruminant nutritionist is to feed the microbes not the cow. The nutritional requirements of cattle are usually divided into maintenance requirements, which depend on

8374-410: The milker generally milks one row at a time. The milker will move a row of cows from the holding yard into the milking parlor, and milk each cow in that row. Once all of the milking machines have been removed from the milked row, the milker releases the cows to their feed. A new group of cows is then loaded into the now vacant side and the process repeats until all cows are milked. Depending on the size of

8480-405: The milker, but also monitoring the process to determine when the animal has been milked out and the milker should be removed. While parlor operations allowed a farmer to milk many more animals much more quickly, it also increased the number of animals to be monitored simultaneously by the farmer. The automatic take-off system was developed to remove the milker from the cow when the milk flow reaches

8586-630: The milking herd, on her second birthday. As the cow's gestation period is a little over 9 months this means the cow must be inseminated by the age of 15 months. Because the breeding process is inefficient, most producers aim to first breed their heifers between 12 and 14 months. Before a heifer can be bred she must reach sexual maturity and attain the proper body condition to successfully bear a calf. Puberty in cattle depends largely on weight among other factors. Holstein heifers reach puberty at an average body weight between 550 and 650 lbs. Smaller breeds of cattle, such as Jerseys, usually reach puberty earlier at

8692-412: The milking parlor, which normally is the bottleneck, these rows of cows can range from four to sixty at a time. The benefits of a herringbone parlour are easy maintenance, the durability, stability, and improved safety for animals and humans when compared to tie stall The first herringbone shed is thought to have been built in 1952 by a Gordonton farmer. In rotary parlors , the cows are loaded one at

8798-440: The morning and bring it to market on a wagon. Until the late 19th century, the milking of the cow was done by hand. In the United States , several large dairy operations existed in some northeastern states and in the west, that involved as many as several hundred cows, but an individual milker could not be expected to milk more than a dozen cows a day. Smaller operations predominated. For most herds, milking took place indoors twice

8904-469: The most desirable parts of the diet, most produces feed a total mixed ration (TMR). In this system all the components of the feed are well mixed in a mixing truck before being delivered to the cattle. Different TMRs are often prepared for groups of cows with different nutritional requirements. Female calves born on a dairy farm will typically be raised as replacement stock to take the place of older cows that are no longer sufficiently productive. The life of

9010-514: The most water, from most to least, are the Amazon, Ganges , and Congo rivers. Endorheic basin are inland basins that do not drain to an ocean. Endorheic basins cover around 18% of the Earth's land. Some endorheic basins drain to an Endorheic lake or Inland sea . Many of these lakes are ephemeral or vary dramatically in size depending on climate and inflow. If water evaporates or infiltrates into

9116-493: The necessary treatment. If the cow passes the mastitis inspection, the milking technician will attach the milking cluster. The cluster will run until the cow is fully milked and then drop off. The milk travels immediately through a cooling system and then into a large cooled storage tank, where it will stay until picked up by a refrigerated milk truck. Before the cow is released from the milking stalls her teats are disinfected one last time to prevent infection. Feed for their cattle

9222-462: The number of cows per operator which streamlined the milking process to permit cows to be milked as if on an assembly line, and to reduce physical stresses on the farmer by putting the cows on a platform slightly above the person milking the cows to eliminate having to constantly bend over. Many older and smaller farms still have tie-stall or stanchion barns, but worldwide a majority of commercial farms have parlors. In herringbone and parallel parlors,

9328-489: The pen. Once this process is done, the cow will back out of the parlor and return to the barn. Rotary cowsheds, as they are called in New Zealand, started in the 1980s but are expensive compared to Herringbone cowshed – the older New Zealand norm. It can be harmful to an animal for it to be over-milked past the point where the udder has stopped releasing milk. Consequently, the milking process involves not just applying

9434-544: The plates to remove heat from the milk. This method of cooling can remove large amounts of heat from the milk in a very short time, thus drastically slowing bacteria growth and thereby improving milk quality. Ground water is the most common source of cooling medium for this device. Dairy cows consume approximately 3 gallons of water for every gallon of milk production and prefer to drink slightly warm water as opposed to cold ground water. For this reason, PHE's can result in drastically improved milk quality, reduced operating costs for

9540-418: The quality of milk produced by the cow, it does impact the management of the milking process. Because most milkers milk cattle in groups, the milker can only process a group of cows at the speed of the slowest-milking cow. For this reason, many farmers will group slow-milking cows so as not to stress the faster milking cows. The extracted milk passes through a strainer and plate heat exchangers before entering

9646-418: The rainfall on the area of land included in its polygon. These polygons are made by drawing lines between gauges, then making perpendicular bisectors of those lines form the polygons. The isohyetal method involves contours of equal precipitation are drawn over the gauges on a map. Calculating the area between these curves and adding up the volume of water is time-consuming. Isochrone maps can be used to show

9752-631: The responsibility of the countries sharing it. Nile Basin Initiative , OMVS for Senegal River , Mekong River Commission are a few examples of arrangements involving management of shared river basins. Management of shared drainage basins is also seen as a way to build lasting peaceful relationships among countries. The catchment is the most significant factor determining the amount or likelihood of flooding . Catchment factors are: topography , shape, size, soil type, and land use (paved or roofed areas). Catchment topography and shape determine

9858-461: The river rather than being absorbed by the ground. If the surface is impermeable the precipitation will create surface run-off which will lead to higher risk of flooding; if the ground is permeable, the precipitation will infiltrate the soil. Land use can contribute to the volume of water reaching the river, in a similar way to clay soils. For example, rainfall on roofs, pavements , and roads will be collected by rivers with almost no absorption into

9964-418: The speed with which the runoff reaches a river. A long thin catchment will take longer to drain than a circular catchment. Size will help determine the amount of water reaching the river, as the larger the catchment the greater the potential for flooding. It is also determined on the basis of length and width of the drainage basin. Soil type will help determine how much water reaches the river. The runoff from

10070-481: The supply system being expanded to surrounding communities, people realized that the flow from Pettaconsett would soon fall short of the rising demands. For some years, extremely dry weather caused water consumption to exceed the natural flow of the river, and water had to be supplied by small reservoirs owned by mill companies further upstream. In January 1913, the Providence City Council appointed

10176-433: The tank, where it can be stored safely for a few days at approximately 40 °F (4 °C). At pre-arranged times, a milk truck arrives and pumps the milk from the tank for transport to a dairy factory where it will be pasteurized and processed into many products . The frequency of pick up depends and the production and storage capacity of the dairy; large dairies will have milk pick-ups once per day. The dairy industry

10282-415: The time taken for rain to reach the river, while catchment size, soil type, and development determine the amount of water to reach the river. Generally, topography plays a big part in how fast runoff will reach a river. Rain that falls in steep mountainous areas will reach the primary river in the drainage basin faster than flat or lightly sloping areas (e.g., > 1% gradient). Shape will contribute to

10388-477: The time taken for runoff water within a drainage basin to reach a lake, reservoir or outlet, assuming constant and uniform effective rainfall. Drainage basins are the principal hydrologic unit considered in fluvial geomorphology . A drainage basin is the source for water and sediment that moves from higher elevation through the river system to lower elevations as they reshape the channel forms. Drainage basins are important in ecology . As water flows over

10494-513: The town of Scituate , including the villages of Ashland, Kent, South Scituate, Richmond, and the western part of North Scituate. Other parts of town were destroyed as Providence acquired land surrounding the reservoir. In total, Providence acquired 23.1 square miles (60 km) of land. Most residents of this area were forced to move out of Scituate and received compensation from the city for the property they lost. Some individuals such as businessman and farmer Arthur Steere sold hundreds of acres for

10600-415: The world depending on the climate, dairy size, and feeding strategies. Housing must provide access to feed, water and protection from relevant environmental conditions. One issue for housing cattle is temperature extremes. Heat stress can decrease fertility and milk production in cattle. Providing shade is a very common method for reducing heat stress. Barns may also incorporate fans or tunnel ventilation into

10706-673: The world's land drains to the Atlantic Ocean . In North America , surface water drains to the Atlantic via the Saint Lawrence River and Great Lakes basins, the Eastern Seaboard of the United States, the Canadian Maritimes , and most of Newfoundland and Labrador . Nearly all of South America east of the Andes also drains to the Atlantic, as does most of Western and Central Europe and

10812-462: Was abandoned due to the project. 26.4 miles (42.5 km) of new roads had to be built to make up for the 36 miles (58 km) of roads that were also abandoned. Most people complied as they were forced to settle elsewhere, but some families were unwilling to part with the houses they had inhabited for generations. The Joslin family, which owned large mills in the doomed villages, fought a long legal battle, which they eventually lost. After moving out,

10918-402: Was popular before the arrival of electricity and refrigeration . When refrigeration first the equipment was initially used to cool cans of milk, which were filled by hand milking. These cans were placed into a cooled water bath to remove heat and keep them cool until they were able to be transported to collect facilities. As more automated methods were developed for eating milk, hand milking

11024-401: Was replaced and, as a result, the milk can was replaced by a bulk milk cooler. 'Ice banks' were the first type of bulk milk cooler. This was a double wall vessel with evaporator coils and water located between the walls at the bottom and sides of the tank. A small refrigeration compressor was used to remove heat from the evaporator coils. Ice eventually builds up around the coils, until it reaches

11130-515: Was the largest project ever undertaken in Rhode Island, and workers were housed in a temporary village established nearby. The reservoir was created by the construction of an earth-filled dam across the Pawtuxet River near the former village of Kent. The reservoir began storing water on November 10, 1925. The treatment plant began operation on September 30, 1926. At the official opening ceremonies that day, Providence Mayor Joseph H. Gainer called

11236-410: Was unable to meet the increasingly higher cooling demand of larger milking parlors. In the mid-1950s direct expansion refrigeration was first applied directly to the bulk milk cooler. This type of cooling utilizes an evaporator built directly into the inner wall of the storage tank to remove heat from the milk. Direct expansion is able to cool milk at a much faster rate than early ice bank type coolers and

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