To the jaded, the mention of green buildings implies a marketing gimmick, and to an idealist, it conjures images of buildings built with mud and bamboo with compostable toilets. Invoking a strong response either ways, we recently concluded a Q&A session on Green Buildings on Instagram. The session had over 300-people join over the course of a 30-minute session. 

The first question that we tackled was, ‘What is a Green Building’? My answer, ‘A green building is one where you’re trying to reduce the impact of the building on the environment.’ It is about making the right choices at every stage of the project, with the ultimate goal to minimise one’s footprint on the environment. To make a building green, the architect must treat the environment as a key design criteria from the first step of the design process right until the occupancy stage. 

It is our commitment to build sustainably and we green certify all our houses in Goa. Our first home, Nivim was the first green certified residence in Goa. It received a gold-level certification and our project Navovado has recently been awarded the platinum-level certification by the Indian Green Building Council. Platinum being the highest level available in the ranking system.

While a building can absolutely be green without a certificate, a green certification is a great way to stay accountable to oneself throughout the design and construction process. It provides the involved professionals with a detailed list of checks and balances with specifications and design criteria that need to be considered and incorporated at every stage of the design and construction process.

In India, TERI (home-grown) and IGBC (offshoot of USGBC) are the primary agencies that issue green certifications. Both these organisations use a credit based system for the evaluation of green building design and performance. The credits fall under the following categories: Site Planning, Water Efficiency, Energy Efficiency, Indoor Air Quality, and Materials among others. Throughout the process, extensive documentation with detailed calculations are required which is then reviewed and tested by the certification body on site. While the system is elaborate, it proves effective as a way to stay true to one’s goals of sustainability. However, it is important for architects to avoid incorporating design elements or features, just for the sake of securing points and focus instead on strategies that are feasible for that specific project life cycle and use.

Demystifying Green Building

I would like to cut through the clutter on this topic. Specially as I would like to demystify the concept and express that green building design is not necessarily a specialized science, nor is it forbiddingly technical where only certain qualified professionals can build green buildings. On the contrary, it is my strong belief that a building built with the basic principles of good architecture would do very well on the green scorecard. The process of green building design starts with a deep understanding of the site, local climate, wind patterns, local materials and resources. Once a building is sited to take advantage of the sun and wind to maximize daylight and cross ventilation, is designed to be responsive to the weather patterns and is built using local materials, then that in itself is a great start towards making the building green.

In the predominantly hot and humid climate in India, one can further think of reducing the heat gain through an informed design of the building envelope. This will have a tremendous impact on the thermal comfort within a building and hence reduce the energy use in the building. Water is another key natural resource that is dwindling with increased human activity on our planet. Rainwater harvesting provides a simple (sometimes ‘no-brainer’) solution to this problem. The idea is simple, instead of allowing rainwater to drain away from your site, one can design systems to either collect it and reuse on the site itself, or feed it back to the earth to recharge the underground aquifers. In addition, a simple introduction of dual flushes can reduce water use by 50-60% and aerators to taps, which can reduce the water use by upto 70% percent. Aerators mix the water from the taps with air, and as a result the water pressure feels the same even when the amount of water flowing through the taps are reduced.

When it comes to building materials, it is wise to use local materials. In most cases, the vernacular building techniques and the local labor would be well versed with the local material. The green quotient of buildings can be further increased by choosing materials with a higher recycled content, higher recyclability, reusing salvaged materials and materials that are rapidly renewable such as bamboo.

The choices to go green are not always straightforward. Cement for example presents a big conundrum in the building industry. The production of cement produces large quantities of CO2, a greenhouse gas with a lasting impact on global warming and climate change. In fact, the production of every kilogram of Portland cement produces an equal amount (one kilogram) of CO2. This presents a huge challenge for our industry where the widely accepted structural material is cement. Wood is another material that presents a difficult choice with sustainability. On one hand, it is a naturally renewable resource and is biodegradable, and wood can be used and reused multiple times. But at the same time, we are cutting irreplaceable virgin rainforests at an alarming pace with long lasting disastrous impact.

Finally, a green building doesn’t have to cost a lot more. Majority of green building strategies are common sense and based on sound architectural principles, which do not come with an additional cost. In addition, there are simple systems that are available at extremely reasonable prices. The aerators mentioned earlier are a free addition offered by most companies that sell sanitary fittings. The difference is for the architect, client and the vendor to be aware of these systems and integrate them into the building design in a timely manner. 

We must as a community of architects pledge to make green building design as important as aesthetics in our projects. A simple change in the thought process can have a long lasting impact on the quality of life for our future generations, which is a cause worth fighting for.

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How does one build in a rural location with the objective to have minimal or zero-impact on the environment?

This question is the primary driver behind the site planning strategy for The House with Three Pavilions located in Goa, India.

The project site is located on the edge of rice paddy fields with a dense cluster of local forest trees on one side and a coconut grove in the middle. The following diagram illustrates some of the critical measures taken as part of the site planning strategy.

WHY IS AN ECOLOGICAL RESPONSE ADOPTED?

• As Goa gentrifies, rampant new construction threatens to rock the delicate balance between nature and man. This project is our attempt to showcase that the built form can tread lightly on the land with conscious design and measured planning. 

• The design focus is to leave a minimal or zero-impact on the functioning natural ecological cycles at the site that pre-date the new construction. 

• The site is geographically located along the path of the watershed from surrounding higher elevations that finally drains into the Arabian Sea. The design planning is oriented to support and improve the water movement through a comprehensive water management plan.

• The water management plan is implemented to address three primary concerns around the site - to recharge the depleted underground water table, to increase water availability for the paddy fields bordering the site, and to reduce the water load on the Municipal Draining system.

WHAT HAS BEEN DONE?

• During the survey, a natural depression was found at the center of the site with a perennial wetland hosting diverse flora and fauna. This existing depression was dug out (until the underground water level in the driest month) and integrated with the existing well on the site. Today, this natural wetland feature is preserved and developed into a seasonal waterbody which also forms the focal point for the landscape created using a native planting strategy.

• All the roof rain water runoff is captured and along with the site surface runoff, it is directed into the central seasonal pond for rain water harvesting. The edges of the pond were formalized with mortar-less retaining walls built in local laterite rubble. This was done to reduce the erosion of the pond edges and to retain the water as a permanent feature in the landscape

• The pond was further connected to a newly planned system of bioswales that spread the collected runoff water over a larger site surface area increasing the rate and extent of percolation on the site. This keeps the level of our underground water table high throughout the year and the soil moist, reducing the garden irrigation requirement in the dry season.

• The bioswales use no cement in their construction and can absorb water through the walls and the base. The construction of the bioswales and the pond without cement, also allows for the water to remain clean without any toxicity of the cement leaching into the landscape.

HOW DOES THIS CREATE A POSITIVE IMPACT?

• The water management was a critical part of this project and offsets the load on the rudimentary public storm water systems found in the Goan villages especially during the heavy monsoons.

• As a result of our efforts, the underground water levels have been improved hence negating the impact of the house construction on the environment. We have been able to prevent any additional flooding at the neighboring fields or any other low-lying area in the village. 

• The project also prioritises the enhancement of the site’s resources and biodiversity. In doing so, it also creates a positive impact on its surroundings by protecting the agrarian viability which is constantly threatened by new construction and increased human activity. Our success can be measured by the number of birds, reptiles, butterflies and insects that can be found on the site today. We have uncovered peacock eggs, cuckoo eggs and baby parrots on our site. It is a win to see that the animals continue to find the site a safe space even as they come in close contact with the human life around, making this truly a space for all seasons and species.

(Water Management Plan in consultation with Pallavi Latkar and team at Grassroots Research Mumbai.)

Our project Navovado has recently been awarded the Platinum-Level Certification by the Indian Green Building Council. Presently, the Platinum Rating is the highest level available in the ranking system awarded by IGBC, the Indian Green Building Council.

With a total of 60 points out of 75, Navovado won the platinum rating from the Indian Green Buildings Council. The credits were awarded for the various green features of building under the following categories:⠀

• Site Selection and Planning.

• Water Conservation.

• Energy Conservation.

• Materials Conservation.

• Indoor Environmental Quality and Occupational Health.

• Innovation & Design Process.

Site Planning, Green Cover and Landscape:

The Navovado site came with 6+ trees on site with some beautiful mango trees and shrubs of different kinds. All of these trees are left untouched on site with the building footprint set at the center, at a safe distance to leave the roots undisturbed.

The landscape plan at Navovado looks at cover from earth to sky, from creepers and grass to tall trees with canopies. At the beginning of construction, our priority was to ensure that we did not lose the top soil. Hence along with the building footprint, planters were incorporated as a first stage detail to conserve site soil on site itself.

Native plant species were selected for plantation based on visual diversity, water consumption, what kinds of animals it would attract and how seasonal the species is.

Water Conservation and Rain Water Harvesting:

Water conservation was a priority throughout the process. Rainwater Harvesting in Navovado has been done from all roof and landscape areas to enhance the ground water table and reduce municipal water demand. ⠀
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The water is directed two ways using natural slopes and site contours to a well on one side and to a soak pit on the other side. To further enhance our goal, we have ensured that no hard scape is used and instead used soft scape that is permeable and allows for water to seep through directly into the ground.

Openings, Light and Ventilation:

The building footprint at Navovado is oriented to capture daylight as well as breeze effectively throughout the day. The openings in each space are designed generously to go above and beyond the minimum percentages required for fenestrations. This results in naturally well lit indoor - outdoor spaces which do not require any artificial lighting in the daytime and therefore cut down on energy expenditure. The openings also allow for continuous air circulation with ample cross ventilation in every part of the structure.⠀

Some of the other innovative material uses that we have tested in Navovado to maximize our sustainability efforts:

• Reuse construction debris to fill under plinth instead of virgin stone rubble.

• Reuse the cut-waste from stone flooring for new flooring

• Use fly ash bricks (with upto 93% recycled content) and slag cement (with upto 65% recycled content) for our super structure

• Use true terracotta mangalore tiles for roofing that ranks high on the solar reflectivity index

What is a green building?

A green building is one where you’re trying to reduce the impact of the construction on the environment. It is about making the right choices at every stage and  looking at every possible way, to optimise resources during and post construction and to minimise or offset one’s footprint right from the design stage to the occupancy stage. Right from positioning the building on the site, being mindful of the solar and wind orientation, looking at the existing resources on site to incorporate them into the building, preserving the underground water table - the environment is part of the design criteria from the very first step of the design process.

Here are some tips for an architect to design a green building

• The building should be designed for its local climate and weather

• The design should be site specific

• The natural features on the site must be preserved whether it is the trees, the underground water table, the contours and terrain, etc

• Plan openings for maximised daylight and cross ventilation

• Reduce the urban heat island effect 

• For landscaping, use lesser amounts of non permeable surfaces like concrete and more permeable surfaces like grass that allow water to percolate and recharge the underground water table

• Reduce concrete exposure because concrete tends to absorb a lot of heat

• Enhance thermal comfort by thinking about all parts of the envelope - the walls, the windows, the shading devices, the roof, etc - to reduce energy expenditure

• Conserve water and collect or harvest rainwater

• Use aerators for taps and dual flushes for WC

• Use solar water heaters

• Use solar panels if the site allows for it

• Compost using house and site waste and feed it back to the garden

• Reduce, Reuse, Recycle

Every little detail helps.

Links to our previous Blog Posts on Green Building:

• GREEN CERTIFICATION

• WHY BUILD GREEN

• GREAT ONLINE RESOURCES FOR GREEN BUILDING

• GREEN FEATURES AT NIVIM

At Grounded, our core mission is sustainability and it really breaks our heart when we read stories on the deforestation of the amazon or deforestation in Asia for Palm oil production. Recently, we came across this article on a brilliant organization, Afforestt and its efforts to create urban forests. Afforestt is based in Bangalore, founded by Shubhendu Sharma and has done consulting work in several countries. They follow a method for afforestation pioneered by a Japanese botanist, Dr. Akira Miyawaki. We got so into the idea that we did a bit more research and have put together a short summary of our findings below.

Research done by Maryam Sheikh, Junior Architect at Grounded.

Edited by Roshini Ganesh, Communications at Grounded.

THE MIYAWAKI METHOD OF AFFORESTATION

The Miyawaki method is a global – local practice of afforestation pioneered by a Japanese botanist, Dr Akira Miyawaki. Dedicated to the protection and regeneration of forests, it places emphasis on the value and contribution of native species to the environment as well as the social fabric that thrives around it. It educates us on how real forests are made up of multi-layered native trees, and that such forests stay firm when subjected to natural disasters.

With increased and widespread deforestation and forest wildfires, it becomes paramount that efficient solutions also flood the world. Disasters such as the Australian bushfires and the unprecedented Amazon rainforest fires have jolted the world awake and into action mode. Yet for those who truly care about climate action, we have systems that have long been working towards protecting the environment without the need of an emergency to spring into action.

The Miyawaki method makes strides by enabling the creation of micro, mini and mega forests using the same core principles. It gives us layered and more variegated habitats that are dependent on local flora and fauna. It is important to note that it is this consideration of native species that sets this method apart, and not the way of placement. 

The following are the steps to realize this ingenious method:

1. First, the soil is prepared by adding a combination of materials that allow for perforation and water retention. Naturally available resources such as rice husk, wheat husk, peanut shells, and corn cobs perforate the soil and make room for the plant roots to grow quickly. Water retainers like coco peat and sugarcane stalk increase the soil’s water retention capacity. To complete the preparation, nourishing mixtures like manure and vermicompost are added to the composition to create a nutrient rich environment for the saplings.

2. Next, the land is surveyed to identify native species that are best suited for plantation together. Not everything that grows in a space belongs there - it is therefore important to look through the historical records of that region in order to understand what is really native. The local plant species are categorized into 4 layers:

   1. Shrubs – those that grow up to 6 feet (1.8m)

   2. Sub-trees – that grow up to 25 feet (7.6m)

   3. Trees – that grow up to 40 feet (12 m)

   4. Canopy trees – that grow above 40 feet

The saplings are introduced at a stage when they have grown to a height of 24-32 inches (0.6-0.8m) above the ground.

3. The design and arrangement of the forest belt is the next step. The more staggered the species are, the better it is for the forest. These various indigenous trees are planted close to each other with an average of 3-5 saplings accommodated in every square meter. Contrary to most myths, the saplings will not fight for nutrition, but learn to survive in a co-dependent manner. The plants work in harmony to create strong root networks underground that allow them to interact with each other and share nutrition between species. This also reduces the depletion of soil nutrition, and erosion over time.

4. Once the saplings are planted, the soil needs to be layered with a thick layer of mulch that acts as a soil insulator to ensure the moisture within remains intact and does not evaporate. To safeguard the upcoming forest saplings against weeds, the land requires maintenance for the first 2 years, after which the mantra becomes– “No management is the best management”.

The density of these tight-as-a-fist forests creates a diverse natural habitat above ground that invites varied biodiversity over time. It also creates a steady nexus of root clusters below ground that stay strong and hold ground when faced with natural calamities like storms, floods, tsunamis as well as man-made adversities like deforestation.

The Miyawaki method was first brought to India in 2009 and has been adopted by Afforest – a social enterprise founded by a humble engineer and environment saviour, Shubendu Sharma.

His sincere effort to spread the technique has already touched ground in 50 cities across the globe empowering people with information on how to grow a forest, starting with their own backyards. His studies illustrate the exponential benefits of growing a multi-layered forest vs a monoculture forest to create a habitat that is 100 times more bio diverse, is 100% natural, allows for 30 times more groundwater recharge and soil conservation, among many others.

Many homegrown organisations like Afforest, Thuvakkam (Chennai), and SayTrees (Bengaluru) use the Miyawaki method in afforestation throughout India. Afforest has planted 4.5 lakhs trees across their 108 projects; ninety of these sites are located in India. Say Trees engages with citizens and corporates, and has helped plant 70,000 trees in Bengaluru from 2008.

Adjacent to the Manyata Tech Park, five mini forests have been planted by a team of 15 citizens, spread across 7850 sq m. All of these have been created by the residents of Manyata Residency nearby in close collaboration with Say Trees.

Other organisations such as the Sugi Project take the concept of re-wilding urban land door to door and empower everyday citizens to invest in nature and restore biodiversity. Their ongoing project at Maruvan with Afforest takes the Miyawaki idea many steps forward, envisioning a nursery, a tree seed bank, and a forest on presently arid desert terrain. These forests create a natural native green lung, bring alive degraded land, offset the carbon footprint, and build community.

Afforestation through the Miyawaki method enlivens the land as well as the very idea of plantation. It arms us with the ability to make the dream of living near a forest, a reality – provided we create one. It gives us the opportunity to take responsibility for better natural systems, to create space for biodiversity, and to create hope.

Jodhpur is a beautiful city, with a majestic fort, luxury hotels, incredible shopping and even a zipline for the adrenaline junky. To add to it all, I found another visionary piece of the city quietly tucked away in the hills below the Mehrangarh Fort.

Rao Jodha Park, is a one of its kind, concerted effort in India to restore the natural ecology of a place. The large, rocky wasteland (now the park) had been taken over by Baavlia, a foreign invasive shrub from Central America.

Baavlia, a fast spreading plant (some consider it a weed) was introduced in Jodhpur over a century ago. It was originally thought that this magic plant would provide abundant grazing for the cattle in the city. The result however was that, it killed all the native plants in the area, and the animals refused to feed on it.

In 2006, identifying this as a problem with long term environmental damage, the Maharajas of Jodhpur initiated a project to restore the area to its original ecosystem. I was told that eradicating the Baavlia, sourcing seeds of original native species and allowing them to thrive once again was an arduous task. But the result is beautiful, it is a piece of historic Thar desert landscape, that is dry, rocky, with surprising bursts of color and water!

I am a huge optimist and any small measure of thoughtful action makes me happy and brings me joy. So I loved being in the park, listening to the stories, learning about the desert landscape by exploring, taking in the sights and smells. It is a great place to wander and wonder about the complexity of nature, its delicate balance and yet the resilience and longevity of it.

Why are native plants important ? Native plants are the species of plants that have adapted to the geographical and climatic conditions of a particular place. They are a vital part of the local food chain and natural ecosystem that has balanced itself over many years. They do not require additional irrigation, fertilizers, or other resources to grow. Once taken root they form a part of the ecosystem and can peacefully co-exist with other varieties of local flora and fauna. Finally, many traditional practices and livelihoods in the local area may also depend of the local species, such as traditional medicine, fodder for cattle, shelter, crafts, etc.

All images courtesy of Rao Jodha Park website and Motherland Magazine Ecology issue.