Glossary entry (derived from question below)
English term or phrase:
Drainage Break
Spanish translation:
divisoria (y vaguada)
English term
Works in: English to Spanish
Drainage Break
| 3 | divisoria (y vaguada) |
Pablo Cruz
|
| 2 | rotura del canal de drenaje |
JohnMcDove
|
PRO (2): JohnMcDove, Pablo Cruz
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Proposed translations
MSc Engineering, MA Translation Studies
Native in: Spanish 
Works in: German to Spanish, French to Spanish, Italian to Spanish, and 2 more.
divisoria (y vaguada)
Por los resultados entiendo que es un término para designar divisorias y vaguadas, aunque en tu caso parece referirse en concreto a una divisoria.
... that effectively end the road lenght include natural drainage break (divides and swales)...
http://landsmart.org/wp-content/uploads/2015/03/Chapter-7-Ma...
...Erosion potential depends on slope and a table is provided on
the next page that gives the maximum distance between waterbars, or between a
waterbar and the next upslope drainage break...
ftp://frapftp.fire.ca.gov/outgoing/firerepair/Post Fire Eros...
....As the WP-43B levee proceeds around the west side of Bakke, there will be a
drainage break. Southwest of this break the inside ditch will flow down to the West Retention Pond...
http://fmdam.org/wp-content/uploads/2013/09/DDR_OHB_WP-43B_D...
...road surface drainage features that effectively end the road length include functional waterbars, rolling dips, and natural drainage break (divides and dips)...
http://naparcd.org/wp-content/uploads/2014/10/Handout_May201...
Sobre divisorias y vaguadas:
http://www.albireotopografia.es/topografia-del-relieve/
Espero que ayude,
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Note added at 1 hora (2018-01-29 19:04:03 GMT)
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De tu texto:
...The measurement will extend to a point where the slope of the road changes and begins to drain in the opposite direction... corresponde en efecto con una divisoria que se llama así porque divide las aguas (la lluvia que cae a un lado va para un arroyo/vertiente, la que cae al otro va para otra vertiente)
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