informe sostenibilidad

7/18/2019 Informe Sostenibilidad

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Fuente: Dürr (1995, pág. 39) en Minke, Gernot. Techos Verdes Planeación, Ejecución y Consejos prácticos.http://www.greenroofs.org/index.php/about-green-roofs/green-roof-benefits

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Fuente: Ryerson University. Report on the Environmental Benefits and Costs of Green Roof Technology for the City of Toronto 2005.

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Fuente cifra precipitación: CAR, Regional Cundinamarca. Estación hidrometeorológica Paloquemao.Nota: 50% de retención es el caso más pesimista.

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Si se utiliza el 10% de los techos disponibles,

la cantidad retenida sería = 1,500 millones de

litros al año.

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Si se ponen techos verdes en el 1% disponible,estos recibirían 300,000 m3 de agua. Si retiene el

50%, dejan de escurrir: 150 millones de litros

al año.



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-./6B.B B0/ I6@0-32J/A763207



Ozono O3

MaterialParticulado

La significancia del impacto depende de que se trate de una cobertura

amplia. Es decir, igual o mayor al 10% de los techos disponibles en Bogotá.

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“En Bogotá los más afortunados, por así decirlo, son los habitantes de las zonas de Usaquén y Suba,quienes gracias al diseño de los planes parciales nuevos cuentan hasta con 9 metros cuadrados de espaciopúblico cada uno. Los más afectados son los habitantes del centro de la ciudad, pues en sectores como LaCandelaria sólo se cuenta con 1.3 metros cuadrados de espacio público por persona.”

Fuente: http://www.eltiempo.com/archivo/documento/CMS-7634408

http://www.dinero.com/internacional/edificios-esponja-para-limpiar-aire-podrian-futuro_87432.aspx

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La Organización Mundial de la Salud, recomiendaque una ciudad mediana, tenga 15 m2 de verde,siendo 10 m2 el mínimo aceptable.

Bogotá: 4.93 m2

Chicago: 100 m2

Santiago de Chile: 10 m2



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Fuente: Preference for Nature in Urbanized Societies: Stress, Restoration, and the Pursuit of Sustainability. Agnes E. van den Berg , Wageningen University. TerryHartig, Uppsala University. Henk Staats, Leiden University. 2007.

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El objetivo de política urbana, debería ser diseñar y planearsoluciones que combinen los beneficios de una ciudadcompacta (en términos de sostenibilidad) , sin comprometerel espacio verde que las personas requieren para reponerse.

Agnes E. van den Berg. Preference for Nature in Urbanized Societies: Stress, Restoration,and the Pursuit of Sustainability. Wageningen University. 2007.

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Establecer indicadores de impacto cuantitativos, es undesafío aún sin resolver. Sin embargo, el impacto positivo delcontacto con la naturaleza sobre la psiquis humana ha sidodemostrado ampliamente.

Urban greenery (árboles, parques, techos verdes) es unaopción de diseño residencial que promueve la sostenibilidadurbana desde un punto de vista ambiental, social, psicológicoy físico.

860207:.@ T0@B0J32J/A763207



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La reducción en emisiones: es relevante en ciudades con uso extensivo de calefacción yaire acondicionado.

Agnes E. van den Berg. Preference for Nature in Urbanized Societies: Stress, Restoration, and the Pursuit of Sustainability. Wageningen University. 2007.

Efecto sobre la concentración: cero. La concentración de CO2 es en promedio constantea nivel global y es de 380 ppm. Reducirla requiere de acciones globales comprometidas.

Sin embargo, los techos verdes, independientemente de la magnitud: producen oxígeno yabsorben C02 mientras los techos grises no hacen ninguna de las dos.

“Los techos verdes tienen una capacidad inferior de capturar CO2 que los bosques yárboles urbanos”. (Fuente: EPA)

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Los techos verdes aumentan el aislamiento del sonido víaabsorción, difusión y esparcimiento

(Mürb 1981) en Minke, Gernot. Techos Verdes Planeación, Ejecución y Consejos prácticos.

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http://www.greenroofs.org/index.php/about-green-roofs/green-roof-benefits.

Un techo verde con 12 cm de

capa de substrato puede reducir

el sonido en 40 decibeles; uno

de 20 cm entre 46-50 decibeles.

En general, no es decisivo el efecto de absorción acústica de lasplantas, sino principalmente del sustrato sobre el que estas crecen.

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1.5 m2 de pasto sin cortar, produce suficiente oxígenopor año para suplir la necesidad anual de una persona.


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1 m2 de vegetación, produce suficiente oxígeno por añopara suplir la necesidad anual de una persona.

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El costo de la estrategia verde-gris es aproximadamente USD$5.3 billones de los cuales $2.4 billonescorresponden a la infraestructura verde, es decir $1.5 billones menos que la solución con pavimentotradicional. “(el plan de infraestructura verde) es una forma de alcanzar más de una cosa con los dólares de

impuestos” Chris Strickland, diputado del Departamento de Protección Ambiental de Nueva York

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Nueva York recientemente lanzó un plan de infraestructura verde que busca enfrentar la escorrentía en el10% de las superficies de la ciudad. La estrategia va desde barriles para recoger agua lluvia, hasta techosverdes.

La ciudad calcula que en un periodo de 20 años recibirá entre $139 millones y $418 millones en beneficiosadicionales de la infraestructura verde como ahorro en energía, valorización de las propiedades, salud, etc.

El análisis costo beneficio de distintos escenarios de techos verdes en Nueva York arrojó que la relacióncosto beneficio media es de 1.02 en un periodo de 55 años. Esta relación puede ser mejorada si se mejorala selección de plantas para remover polución y si se disminuyen los costos de construcción. Acks (2005)

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Los resultados demuestran que el valorpresente neto (VPN) de los techos verdes es28 a 48% inferior al de los techos

convencionales sobre la vida útil de un techoverde (40 años), y que su VPN se hacepositivo a los seis años principalmente dadoslos beneficios sobre salud por la mitigación depolución y la gestión de las escorrentías deaguas lluvias. Quantitative assessment of green roof benefitsfor Vancouver 2010.

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Si se ponen techos verdes en el 1%disponible, estos recibirían 300,000 m3 deagua. Si retiene el 50%, dejan de escurrir: 150millones de litros al año.

^$, (+/1/, /+ (+/1,$# 5&,N#: +$ &, >0+ -+ %0*",+& T;U /+ &#- 2+%<#- /+ &, %10/,/: 5+"(14"?,%,520"," +& Y'YU /+ &,- +(1-1#$+- 2#2,&+- Em'mU /+&,- +(1-1#$+- (B31&+-I' A# %0,& -+"?, -1!$16%,43#

/+$2"# /+ 0$, +-2",2+!1, 1$2+!",& 5,", (+O#"," &,%,&1/,/ /+& ,1"+ +$ 7#!#28'

El objetivo de política urbana, debería serdiseñar y planear soluciones que combinen losbeneficios de una ciudad compacta (en

términos de sostenibilidad) , sin comprometerel espacio verde que las personas requierenpara reponerse.

AguaAire

Bienestar Verde VPN

informe sostenibilidad

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