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Resumen: Los retiros a las corrientes de agua se refieren a zonas alrededor de los cauces que los contiene y en las que se imponen restricciones sobre el uso del suelo y algunas intervenciones antrópicas. Tradicionalmente se ha normatizado la zona de retiro como una franja definida por líneas paralelas a ambos lados de la corriente y a una distancia predefinida de los bordes del cauce en condiciones de máxima inundación. Para las corrientes naturales, las definición adoptada tiene grandes problemas desde el punto de vista práctico y operativo para la determinación, reglamentación y vigilancia de las áreas de retiro debido a la dinámica de los cauces y su continua transformación, la asimetría de las secciones de los cauces, y a que el alineamiento es de carácter bidimensional.

http://bdigital.unal.edu.co/5269/1/DA_3815.pdf

It seems to refer to riverbanks

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Note added at 38 mins (2019-06-01 22:40:26 GMT)
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In the following reference, the term has been translated as 'hydrologic flood plains'.

http://bdigital.unal.edu.co/6090/1/No._10-2003-1.pdf

In this case "quebrada" is "creek", i.e. Juan Bobo Creek.

I think "retiro" is "setback" (buffer zone), but I am not too confident.

https://forum.wordreference.com/threads/retiros-de-quebradas... ( found this, but I am not certain that it is an accurate description of "retiro (a ríos y quebradas)", hence my posting as a reference only. You can investigate further, as unfortunately, I don't have time to thoroughly research.


retiros de las quebradas son unas distancias minimas entre la orilla de la quebrada o rio y cualquier otra construccion. Estos retiros se establecen por ley, y su funcion es servir como proteccion a la fuente de agua. Usualmente se siembran arboles, o pasto. Los retiros son parte del espacio público asi como los parques y las plazas, por eso es ilegal ocuparlos o construir en ellos.


https://www.medellin.gov.co/normograma/docs/cto_sgmed_000006...
El Departamento Administrativo de Planeación mediante radicado 201500245392 del 23 de junio de 2015, en comunicación a las Empresas Públicas de Medellín, emitió un concepto acerca de esta clase de intervenciones en los retiros de quebradas, catalogadas como suelo de protección, y fundamentado en las normas del Plan de Ordenamiento territorial de la Ciudad, Acuerdo 48 de 2014, considera factible, la implementación de servicios públicos no convencionales y temporales.

Normograma Municipio de Medellin [CTO_SGMED_0000069_2017]
https://www.medellin.gov.co/.../cto_sgmed_0000069_2017.htm
Asunto: “Factibilidad de intervenciones en viviendas existentes en **retiro de quebrada (suelo de protección)**, para el mejoramiento ambiental de recurso Hídrico ...



http://www.bvsde.paho.org/foro_hispano/Diccionario_de_Constr...
retiro > setback


https://qcode.us/codes/santarosa/view.php?topic=20-3-20_30-2...
Creekside development.
A. Purpose. This Section requires minimum setbacks from waterways for new structures, to provide reasonable protection to owners of riparian property and the public from the hazards of stream bank failures and flooding, while allowing owners of property near waterways reasonable use of and the opportunity to improve their properties consistent with general safety.

B. Applicability. No structure, including buildings of any type, swimming pools, including prefabricated swimming pools, driveways, streets, parking areas, patios, platforms, decks, fences, liquid storage tanks, mobile homes, broken concrete rubble, earth fill or other structural debris fill, or retaining walls, shall be placed within the creekside setbacks required by this Section.

1. Existing structures. An existing, lawfully constructed structure that is located within a setback required by this Section is subject to the requirements for nonconforming structures in Chapter 20-61 (Nonconforming Uses, Structures, and Parcels).

2. Exceptions. This Section shall not apply to:

Storm drainage, erosion control, and creekbank stability improvements that have been approved as required by law by the governmental agencies having jurisdiction over them.

3. Design guidelines. See also Section 4.4 (Creeks, Riparian Corridors, and Storm Drainage) of the City’s Design Guidelines.

C. Definitions. Definitions of the technical terms and phrases used in this Section may be found in Division 7 (Glossary), under “Waterway.”

D. Creekside setback requirements.

1. Waterway with defined bank. The exterior boundary of the setback area on each side of a natural or modified natural waterway shall be 50 feet from the top of the highest bank on that side of the waterway, as determined by the Director. When the bank of a natural or modified natural waterway is steeper than 2.5:1, the exterior setback boundary shall be measured by the projections of a slope of 2.5:1 from the toe of the stream bank to ground level, plus 50 feet. See Figure 3-1.

2. Waterway without defined bank. The exterior boundary of the setback area adjacent to the side of a natural or modified natural waterway, where the top of the stream bank is not defined, shall be 50 feet, measured horizontally, from the established 100-year storm freeboard level. See Figure 3-2.