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Mill Race, Redbournbury Mill, River Ver, near St Albans.

A mill race, millrace or millrun,[1] mill lade (Scotland) or mill leat (Southwest England) is the current of water that turns a water wheel, or the channel (sluice) conducting water to or from a water wheel. Compared with the broad waters of a mill pond, the narrow current is swift and powerful. The race leading to the water wheel on a wide stream or mill pond is called the head race (or headrace[2]), and the race leading away from the wheel is called the tail race[3] (or tailrace[2]).

A mill race has many geographically specific names, such as leat,[4] lade, flume, goit, penstock. These words all have more precise definitions and meanings will differ elsewhere. The original undershot waterwheel, described by Vitruvius, was a 'run of the river wheel' placed so a fast flowing stream would press against and turn the bottom of a bucketed wheel.[5] In the first meaning of the term, the millrace was the stream; in the sense of the word, there was no separate channel, so no race. The example of Mill Lade in Godmanchester refers to a wide channel leading to moorings where laden vessels unload, similar waterways known by the similar name of Lode exist in neighbouring districts.

As technology advanced, the stream was dammed by a weir. This increased the head of water. Behind the weir was the millpond, or lodge. The water was channelled to the waterwheel by a sluice or millrace- this was the head race. From the waterwheel, the water was channelled back to the course of the stream by a sluice known as the tail race. When the tail race from one mill led to another mill where it acted as the head race this was known as the mid race. The level of water in the millrace could be controlled by a series of sluice gates.[5]

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Mill race

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A mill race, also known as a millrace, is an artificial channel or dug to divert from a , , or to power a water mill, or the swift current of flowing within such a channel to drive the mill's . It typically consists of two main components: the head race, which channels toward the mill to supply the wheel, and the tail race, which carries spent away from the mill back to its source. These structures were engineered to harness hydraulic power efficiently, often lined with earth, concrete, or stone to maintain flow and prevent . The origins of mill races trace back to the development of water mills in the ancient world, with the earliest known examples emerging during the in around the 3rd century BCE, where they powered grain-grinding mechanisms. The technology spread through the , exemplified by the complex of 16 water mills at Barbegal in (circa 2nd century CE), which utilized interconnected mill races and aqueducts to produce up to 25 tons of flour daily, representing one of the first instances of industrial-scale . By the early medieval period in , mill races became integral to feudal economies, with records of over 6,000 water mills in alone by the 11th century survey, facilitating by grinding grain for communities and lords. In , particularly , mill races contributed to the formation of specialized cultural landscapes known as "molinotopes" from the onward, altering river courses, creating ponds, and supporting settlement growth around mills; by the late , the region hosted over 1,200 such installations before their decline with the Industrial Revolution's shift to steam power. These channels not only drove mechanical processes like milling and forging but also influenced local hydrology and land use, often requiring legal regulations to manage water rights among multiple mills sharing a race. In the , mill races powered early colonial industries, such as the 1646 Saugus Iron Works in , where they activated , hammers, and rollers for iron production. Today, many historic mill races persist as archaeological and ecological features, with some restored for educational or small-scale purposes, underscoring their role as precursors to modern . Their design principles—efficient water diversion and controlled flow—continue to inform contemporary .

Definition and Terminology

Definition

A mill race is an artificial channel or the swift current of water engineered to direct flow toward a in a water mill. It typically includes a head race, which supplies water to the wheel, and a tail race, which discharges the water afterward to prevent . This feature is essential in traditional water-powered milling systems, where the controlled channeling of water ensures efficient energy transfer without relying solely on the natural stream's variability. The primary function of a mill race is to convey from a source, such as a or , to the to harness the hydraulic energy of the through its flow to the wheel and discharge afterward, utilizing from motion and/or from depending on the wheel configuration, after which the is directed away to prevent and maintain . Unlike a , which serves as a static body of stored to regulate supply and create head pressure, the mill race represents the dynamic conduit for active movement, focusing on rapid delivery rather than accumulation. The term "mill race" derives from "race" denoting a or rapid flow of , with the earliest recorded English usage appearing around 1470–1480 in historical texts describing milling infrastructure. This etymology reflects the feature's emphasis on accelerated currents, distinguishing it from slower or broader management elements in agrarian .

Terminology and Regional Names

A mill race refers to the channel or current of water that powers a water mill's , with various synonyms reflecting regional dialects and historical usages in English-speaking areas. Common terms include millrun, denoting the swift flow of water in the channel; flume, often describing an elevated trough or conduit carrying water to the ; goit, a term prevalent in , particularly the West Riding of Yorkshire and , for a large artificial leat serving industrial mills; and , typically used for the final pipe or chute delivering pressurized water directly to the in certain hydraulic setups. Regionally, the term mill lade is specific to , where it describes a constructed watercourse or millstream channeling flow from a to the mill , as documented in Scots linguistic records. In Southwest England, particularly and , mill leat designates an open aqueduct or leat system engineered to transport water by gravity to mills, often associated with and agricultural sites. These variations highlight how local and milling traditions shaped , with leat emphasizing earthen channels in the rugged terrains of the southwest and lade tied to broader management practices. The term "mill race" evolved from Old English rǣs, meaning a rush or swift running of water, which combined with "mill" to describe the channeled current by the late Middle English period, as seen in early engineering and agricultural texts. This etymology underscores the focus on the water's rapid movement, distinguishing it from slower streams, and persists in modern hydraulic engineering references. Beyond English, non-English terms illustrate cross-cultural adaptations in milling. In French-speaking regions, bief refers to the mill race or section of a waterway between locks or dams that drives the wheel, a usage rooted in historical European water management. In colonial contexts, particularly in the American Southwest influenced by Spanish practices, acequia systems—communal irrigation ditches—were adapted for mills, blending indigenous and European techniques to channel water for grinding operations in arid environments.

Historical Development

Ancient and Classical Origins

The earliest evidence of mill races emerges from horizontal water mills in around the 3rd century BC, where simple channeled streams served as proto-races to direct water flow to the wheels. The Greek engineer (c. 280–220 BC) provided the first written descriptions of these devices in his treatises Pneumatica (chapter 61) and Parasceuastica, depicting water-powered mills that ground grain using horizontal wheels turned by diverted stream currents. Archaeological findings, such as the Perachora wheel near (c. ), support this, illustrating early reliance on natural watercourses for powering rudimentary milling operations without engineered head control. Roman engineers built upon these Hellenistic foundations, integrating more systematic water management into mill designs during the late and early . Pollio (c. 40–10 BC), in (Book X, chapter 5), detailed undershot water wheels driven by river flows, emphasizing the use of basic sluices and channels to regulate water delivery to the wheel's floatboards for efficient power transmission to millstones. These descriptions highlight the transition to vertical-wheeled systems compatible with channeled races, marking a key advancement in harnessing from controlled water paths. A exemplary Roman implementation is the Barbegal complex near Arles, , constructed in the AD along an aqueduct supplying water to Arles from springs in the . This site featured two parallel aqueducts feeding a series of 16 overshot wheels via cascading races, enabling industrial-scale production estimated at 25 tons per day and representing one of antiquity's largest mechanized milling operations. The parallel channels, each about 1.4 meters wide and following the natural hillside gradient, demonstrated sophisticated flow distribution without extensive damming. Technological constraints in these ancient systems stemmed from dependence on unaltered stream gradients, as mills typically exploited low-head flows from natural rivers or aqueducts rather than impounded reservoirs created by dams. This approach limited power to seasonal water availability and site-specific topography, restricting scalability until later innovations in water storage.

Medieval Expansion and Innovations

The , compiled in 1086 under , recorded 5,624 watermills across , reflecting a dense network of milling infrastructure that had proliferated since the . These mills necessitated extensive systems of mill races—channels directing water to the wheels—and weirs to impound rivers and create the required for efficient operation, often altering local waterways on a regional scale. This widespread adoption underscored the mill race's role in transforming 's agrarian economy, with one mill serving approximately every 300 people in surveyed areas. During the 12th century, monastic orders, particularly the founded in 1098 at Cîteaux in , drove significant innovations in mill race design to support self-sufficient communities. Cistercian abbeys, such as those in like Fontenay (established 1118), incorporated mill ponds—artificial reservoirs—to store water and ensure consistent flow, alongside regulated headraces featuring sluice gates for precise control over water delivery to multiple mills. These advancements allowed for integrated hydraulic systems powering not only grain mills but also and tanning operations, with earthworks and timber-lined channels preserving water levels year-round. By the mid-12th century, the order had grown to over 300 houses across , many utilizing such engineered races, enhancing productivity and exemplifying monastic contributions to medieval . The medieval expansion of mill races extended beyond Europe through Byzantine and Islamic adaptations, as well as early applications in Asia. In the Islamic world, 9th-century mills in Baghdad employed norias—large, compartmented water wheels—paired with elevated races to harness the Tigris River's flow for irrigation and grinding, facilitating urban-scale milling in arid regions. These systems, inherited and refined from Byzantine precedents, lifted water up to 30 meters, enabling multi-story mills that influenced water management across the Abbasid Caliphate. Concurrently, in China during the Song Dynasty (11th century), water-powered mills with dedicated races were adapted for rice hulling, using trip hammers to process wet paddy in southern rice-growing regions, boosting agricultural output amid population growth. Mill races reinforced feudal structures by enabling lords to monopolize milling, extracting tolls from tenants obligated to use designated facilities—a practice known as "suit of mill" or multure. In 12th-century , this led to frequent legal disputes over water rights, as upstream weirs and races often caused flooding or diverted flows, prompting royal assizes to regulate access and resolve conflicts between manors. Such monopolies generated substantial seigneurial income, with mills yielding up to one-sixth of a manor's , while fostering early precedents on riparian rights that persisted into later centuries.

Engineering and Components

Headrace Design

The headrace serves as the inbound channel in a mill race system, diverting water from a or river source to the while maintaining controlled velocity and minimizing turbulence to optimize delivery. This component is essential for harnessing effectively, ensuring a steady flow that powers the without excessive splashing or loss. Design elements of the headrace typically included channels 1.5 to 3.2 meters wide and approximately 0.8 meters deep, lined with stone, wood, or compacted earth to reduce seepage and erosion. Sluice gates, often wooden or iron, were installed at the intake and near the wheel to regulate flow volume and timing, while debris screens or trash racks—barred structures at the channel entrance—prevented branches, sediment, and larger obstructions from entering and damaging the mechanism. These features allowed mill operators to adapt to varying water availability and seasonal conditions. Engineering considerations emphasized a very gentle , often around 1:2000 or less, to promote at speeds suitable for the wheel type without causing scouring or stagnation. Headraces were integrated with upstream dams or weirs to impound water and generate the required head, typically 1 to 5 meters for undershot and breastshot configurations prevalent in historical mills. In medieval , notably on , leats serving as headraces extended significant distances to remote mills, with longer examples up to 30 km developing in the , showcasing feats in contour-following excavation for sustained water supply.

Tailrace and Midrace

The tailrace is the channel positioned below the in a water mill, through which exits after imparting energy to the wheel and returns to the original or . To prevent backpressure that could impede , the tailrace is engineered at a lower than the headrace, creating the necessary for efficient operation and allowing to discharge freely without submerging the wheel's lower buckets. Historical designs often incorporated a minimal clearance, such as 6 inches between the wheel's bottom and the tail surface, to accommodate variations in flow and avoid binding during periods of high . Key engineering features of the tailrace include provisions for controlled flow and of hydraulic . Width is typically matched to the wheel's dimensions—often adhering to a 1:1.5 —to handle discharge without flooding the mill structure or reducing . Vent gates, integrated into the , regulate levels by allowing at optimal heights, thereby maximizing the effective fall and preventing stagnation. Sediment traps or areas along the tailrace help capture to sustain consistent flow rates, though historical implementations varied by site and were more commonly emphasized in headrace to protect machinery. In multi-mill configurations, the tailrace of an upstream mill could function as the headrace for a downstream one, forming what is known as a midrace and enabling sequential power utilization in compact industrial settings. This cascading arrangement was prevalent in 19th-century textile valleys, where limited terrain necessitated efficient water sharing among clustered operations, such as in the Derwent Valley of , birthplace of the factory system. A notable historical example is Castleford Mills in during the 18th century, where interconnected tailraces supported sequential milling processes, powering multiple wheels from shared watercourses before major Victorian upgrades in 1884.

Construction Techniques

The construction of mill races began with earthworks, involving the manual excavation of channels using hand tools such as shovels and picks, often supplemented by horse-drawn scrapers to move larger volumes of soil efficiently. These initial digs created open channels that were then lined to prevent seepage and erosion, typically with locally sourced materials like puddled clay for impermeability, dry-laid stone walls for durability in rocky terrains, or timber planks and revetments in wooded areas. By the , advancements in hydraulic engineering led to the adoption of concrete linings, particularly reinforced variants, which provided greater resistance to water pressure and longevity in high-flow environments, as seen in upgrades to existing races around 1912. Diversion dams, essential for channeling water into the headrace, were typically built from local stone piled or mortared to form low barriers across streams, often combined with brush and timber cribs filled with rock or soil for stability. gates at the dam's outlet and mill intake were constructed primarily from , valued for its strength and water resistance, with iron fittings such as hinges, bolts, and lifting mechanisms to enable precise flow regulation. Key engineering challenges included along channel banks and beds, addressed through revetments made of stacked stone, timber piles, or woven branches to reinforce slopes and maintain structural integrity. Seasonal maintenance was critical, involving manual or mechanical removal—often by with scoops or drags—to prevent from reducing water depth and flow capacity, a practice documented in annual cleanings of operational races. principles for balancing flow, such as calculating channel gradients and gate operations to optimize velocity without scour, were advanced in 18th-century French treatises like Bernard Forest de Bélidor's Architecture hydraulique, which detailed mill race configurations for efficient water management. Mill race scales varied widely based on local and water availability; simple diversions from nearby streams often spanned 1-2 kilometers, relying on minimal excavation to tap sufficient head for small mills, whereas more elaborate systems extended much farther, exemplified by the Amana Colonies' approximately 6.5-mile race in , constructed starting in 1865 and completed by 1869 to serve multiple communal mills with a consistent .

Integration with Water Wheels

Compatibility with Wheel Types

Mill races are engineered to match the specific mechanics of different types, ensuring optimal energy transfer from flow to rotational power. For undershot wheels, which rely on the of flowing , mill races feature low head heights typically between 0.5 and 1.5 meters, emphasizing high flow rates rather than drop. The headrace is positioned at the base of the wheel, directing to strike the paddles from below, while the tailrace provides an immediate exit to maintain continuous high-velocity flow without significant backpressure. In contrast, overshot wheels harness gravitational potential energy, requiring mill races with higher head drops of 2 to 10 meters achieved through elevated channels and . The headrace delivers to the top of the via a launder or , allowing it to pour into buckets on the descending side, while the tailrace collects below the to facilitate complete drainage. Backshot wheels, a variant of the overshot design, use a similar elevated headrace but direct entry just behind the wheel's summit to reverse the direction if needed, optimizing for sites with constrained space. Breastshot wheels, including backshot configurations in some adaptations, employ mid-level headraces that enter at the wheel's sides near height, providing steady hydraulic pressure with heads of 0.5 to 4 meters without the extremes of full overshot or undershot setups. These races incorporate weirs or gates for controlled inflow and inclined tailraces with gentle slopes (e.g., 6/1000) to minimize and head loss during outflow. Adaptations to mill race gradients are crucial for performance, with steeper inclines (often exceeding 1:100) used for overshot wheels to maximize drop, while shallower or horizontal profiles suit undershot designs for preservation. For example, in 18th-century industrial mills like those powering early operations in , overshot wheels were paired with elevated headraces spanning several meters to achieve the required 2-meter-plus drops, enhancing efficiency in hilly terrains.

Power Generation and Efficiency

The mechanical power generated by a mill race system is fundamentally derived from the potential and kinetic energy of water delivered to the wheel, expressed by the hydraulic power formula P=ρgQHηP = \rho g Q H \eta, where PP is power output, ρ\rho is the density of water (approximately 1000 kg/m³), gg is gravitational acceleration (9.81 m/s²), QQ is the volumetric flow rate supplied by the race (in m³/s), HH is the effective head height (in meters) created by the race elevation difference, and η\eta is the overall system efficiency. This formula primarily applies to wheels harnessing potential energy (e.g., overshot and breastshot), while undershot wheels emphasize kinetic energy, often using an effective head equivalent. Mill race design directly influences QQ and HH by channeling water to maximize head and flow while minimizing turbulence and leakage. Efficiency in mill race systems is affected by several factors, including frictional losses in the channel due to effects and . Optimal flow rates for typical historical mills range from 0.5 to 2 m³/s, balancing sufficient for rotation against excessive velocity that could increase splash losses or . Race efficiency is further enhanced by smooth gradients and alignments that reduce entry and exit losses, contributing to overall system η\eta values that vary by type but can reach 60-80% in optimized setups. In the , engineering advancements, particularly by , introduced curved and streamlined race profiles that improved water delivery, elevating efficiency from around 22% in undershot configurations to about 63% in overshot systems by better harnessing . These modifications minimized flow disruptions and maximized head utilization, marking a pivotal shift in mill race optimization. Power output from mill races is commonly measured in horsepower, where 1 hp approximates 0.75 kW, with typical wheels enabled by races producing 5-50 hp depending on site conditions and scale. For instance, mid-19th-century industrial mills often achieved 12-18 hp on average through refined race systems.

Modern Legacy and Variations

Preservation and Historical Sites

Efforts to preserve surviving mill races have focused on their role as , transforming these historical water channels into protected sites that illustrate early . In the United States, the Springfield Mill Race in , hand-dug in the 1850s to power local lumber mills, was donated to the city in 1985 and has since been maintained as a recreational trail, with restoration projects addressing sediment buildup and structural integrity through community-led initiatives. Similarly, the Amana Mill Race in , constructed between 1865 and 1869 as part of the ' communal infrastructure, was designated a in 1965, encompassing the canal and associated landscape features that supported water-powered mills during the . Preservation methods often involve targeted restorations by historical societies, such as stone relining to prevent water leakage and repairs to original wooden gates to maintain hydraulic flow, ensuring the structural authenticity of these features. Legal protections play a crucial role, with many sites listed on national registries like the , providing recognition and eligibility for tax incentives and grants that encourage preservation through adherence to standards. While UNESCO World Heritage status is rare for individual mill races, broader industrial heritage sites incorporating them, such as European canal systems, benefit from international conventions that promote conservation. Challenges to preservation include natural erosion from water flow and human-induced urbanization, which threaten site stability and accessibility. For instance, in , the historic mill race along the has faced repeated damage from 20th-century floods. These sites are vulnerable to . Archaeological research enhances preservation by uncovering the evolutionary development of mill races, providing data for informed restoration. In , digs at Roman-era sites in the conventus bracaraugustanus have revealed early water diversion channels and mill infrastructure, demonstrating adaptations in from the 1st to 4th centuries CE that influenced later designs. These investigations not only document technological progression but also guide modern conservation efforts to mitigate ongoing degradation.

Contemporary Uses and Adaptations

In contemporary settings, mill races have been repurposed for recreational purposes, transforming historic waterways into public trails and parks that promote outdoor activities and connect communities with their industrial heritage. For instance, the Springfield Mill Race in Oregon serves as a linear greenway offering trails for pedestrians, cyclists, and equestrians, while providing access for fishing and boating along its 2.5-mile length. Similarly, Mill Race Park in Columbus, Indiana, integrates the original 19th-century mill race into a 32-acre urban floodplain park with walking paths, native plantings, and flood-resilient design elements that encourage hiking and nature observation. In Pennsylvania, the Mill Race Trail near Avondale offers an easy 1.7-mile hike along remnants of historic milling infrastructure, allowing visitors to explore natural scenery and industrial artifacts in a preserved corridor. Restored mill sites also attract tourism, blending education with leisure. Peirce Mill in Washington, D.C., operational since its 2011 restoration by the , functions as a demonstration museum where visitors can observe traditional grain milling during seasonal weekends, drawing crowds to its scenic location. These adaptations highlight how mill races foster eco-tourism by showcasing sustainable water management alongside historical narratives. Mill races have been adapted for micro-hydroelectric power generation, particularly in the , where disused leats—artificial channels akin to mill races—are retrofitted with small turbines to produce . For example, the Settle Weir scheme near Bridge End Mill in utilizes a 50 kW Archimedean in a historic mill race setting, contributing to local supply since the early . Smaller installations, such as those in and , often generate 1-10 kW using run-of-river turbines in restored leats, supporting rural communities and aligning with UK targets. These retrofits typically involve minimal structural changes to preserve the channels' original engineering while enhancing energy efficiency. Environmentally, restored mill races serve as corridors by reconnecting fragmented habitats and supporting aquatic and riparian ecosystems. At Colvin Run Mill in , rehabilitation efforts along the mill races aim to restore native vegetation and wildlife habitats, increasing species diversity in the surrounding . In , these channels contribute to flood control by accommodating natural water flows rather than resisting them; the Mill Race Park in , for instance, uses the historic race as a storage basin with elevated paths and permeable surfaces to mitigate annual inundations. Likewise, the City of Goshen's resilience plan in incorporates the Mill Race area for stormwater retention, reducing downstream in developed zones through integrated .

References

  1. https://www.merriam-webster.com/dictionary/millrace
  2. https://www.stockdalemill.org/terms.htm
  3. https://concordlibrary.org/uploads/scollect/BuildingHistories/DamonMill/storyPages/millRace.html
  4. https://flymetothemoontravel.com/windmills-and-watermills-in-greece-history-beauty-sustainability/
  5. https://pmc.ncbi.nlm.nih.gov/articles/PMC6124920/
  6. https://historymedieval.com/watermills-a-key-tech-of-the-middle-ages/
  7. https://www.sciencedirect.com/science/article/pii/S0169204619312010
  8. https://www.nps.gov/places/mill-race.htm
  9. https://www.tidemillinstitute.org/water-mills-and-wheels/
  10. http://ui.adsabs.harvard.edu/abs/2023AIPC.2928p0010I/abstract
  11. https://energyeducation.ca/encyclopedia/Mill_race
  12. https://www.angelfire.com/journal/millrestoration/site.html
  13. https://www3.uwsp.edu/cnr-ap/KEEP/Documents/Activities/WaterwheelsWindmillsTurbines.pdf
  14. https://www.dictionary.com/browse/millrace
  15. https://www.oed.com/dictionary/mill-race_n
  16. https://www.merriam-webster.com/thesaurus/millrace
  17. https://new.millsarchive.org/glossary/a-z-glossary/?action=show&which=3208
  18. https://dsl.ac.uk/entry/snd/lade
  19. https://historicengland.org.uk/listing/the-list/list-entry/1425005
  20. https://www.bbc.co.uk/devon/discovering/hometown/cullompton_contd.shtml
  21. https://www.etymonline.com/word/race
  22. https://tureng.com/en/french-english/bief
  23. https://pubs.nmsu.edu/acequias/docs/RR796_ada.pdf
  24. https://www.historyofinformation.com/detail.php?entryid=3509
  25. https://www.jstor.org/stable/301031
  26. https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.02.0073%3Abook%3D10%3Achapter%3D5
  27. https://www.academia.edu/49344310/The_Vitruvian_Mill_in_Roman_and_Medieval_Europe
  28. https://www.science.org/doi/10.1126/sciadv.aar3620
  29. https://www.nature.com/articles/s41598-020-74900-5
  30. https://hundredparishes.org.uk/wp-content/uploads/2023/10/Article-WATER-MILLS.pdf
  31. https://core.ac.uk/download/pdf/20551491.pdf
  32. https://whc.unesco.org/en/list/165/
  33. https://dbc.wroc.pl/Content/112377/31_02.pdf
  34. https://www.britannica.com/topic/Cistercians
  35. https://engineering.fandom.com/wiki/Water_wheel
  36. https://afe.easia.columbia.edu/songdynasty-module/tech-rice.html
  37. https://www.survivorlibrary.com/library/history_of_corn_milling_vol_3_1898.pdf
  38. https://core.ac.uk/download/pdf/151599175.pdf
  39. https://www.engr.psu.edu/mtah/articles/geography_landscape_mills.htm
  40. https://www.legendarydartmoor.co.uk/2016/03/21/leats_moor/
  41. https://wpthistory.org/wp-content/uploads/2022/02/Basic-Principles-of-19th-century-waterpower.pdf
  42. https://royalsocietypublishing.org/doi/10.1098/rsnr.2015.0044
  43. https://www.nj.gov/dep/parksandforests/parks/docs/gfsp_7_0_appendix_c.pdf
  44. https://whc.unesco.org/en/list/1030/
  45. https://www.njwsa.org/uploads/1/0/8/0/108064771/cultural_resources_investigation__rehabilitation_of_the__prallsville_culverts.pdf
  46. https://digventures.com/monuments/mill-race/
  47. https://npshistory.com/publications/saan/hsr-grist-mill.pdf
  48. https://apps.mht.maryland.gov/medusa/PDF/Howard/HO-534.pdf
  49. https://dnr.maryland.gov/publiclands/Pages/central/PatapscoValley/Patapsco-River-Valley-History-Hike.aspx
  50. https://apps.dtic.mil/sti/tr/pdf/ADA316671.pdf
  51. https://new.millsarchive.org/product/belidor-architecture-hydraulique-horizontal-wheel-1780/
  52. https://www.hmdb.org/m.asp?m=48305
  53. https://americancanalsociety.org/wp-content/uploads/2019/08/Amana-Mill-Race.pdf
  54. https://fenix.tecnico.ulisboa.pt/downloadFile/1407770020547395/Tese_Guilherme_Macara_vFinal.pdf
  55. http://www.top-alternative-energy-sources.com/water-wheel-design.html
  56. https://steffenreichel.hier-im-netz.de/Muehlen/Infos/ModernWaterwheels.pdf
  57. https://www.sciencedirect.com/science/article/pii/S1364032118306178
  58. https://energypedia.info/wiki/Water_Wheels_%28PA_Technology%29
  59. https://www.echocommunity.org/en/resources/4f3d05ad-fdfb-40a7-8363-ff2d8627a340
  60. https://www.tandfonline.com/doi/abs/10.1080/00221686.2004.9641215
  61. https://iopscience.iop.org/article/10.1088/1755-1315/22/1/012020
  62. https://www.engr.psu.edu/mtah/articles/vertical_waterwheel.htm
  63. https://pages.uoregon.edu/ecostudy/elp/millrace/history.html
  64. https://www.academia.edu/41762738/Os_Sistemas_de_Moagem_do_Mundo_Romano_O_sul_do_conventus_bracaraugustanus
  65. https://springfield-or.gov/city/springfield-mill-race/
  66. https://www.mvvainc.com/projects/mill-race-park
  67. https://www.alltrails.com/trail/us/pennsylvania/mill-race-trail--2
  68. https://www.nps.gov/places/peirce-mill.htm
  69. https://durham-repository.worktribe.com/OutputFile/1464820
  70. https://www.theguardian.com/environment/2022/apr/30/is-this-the-end-for-the-traditional-british-watermill
  71. https://www.fairfaxcounty.gov/sites/parks/files/assets/documents/plandev/master-plans/colvinrunmillmpfinal.pdf
  72. https://goshenindiana.org/wp-content/uploads/2024/07/City-of-Goshen-Flood-Resilience-Plan-2024.pdf
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