Why Las Vegas Homes are Embracing Desert Landscaping

Sustainable landscaping is a modern type of gardening or landscaping that takes the environmental issue of sustainability into account. According to Loehrlein in 2009 this includes design, construction and management of residential and commercial gardens and incorporates organic lawn management and organic gardening techniques.^[1]

A sustainable garden is designed to be both attractive and in balance with the local climate and environment and it should require minimal resource inputs. Thus, the design must be “functional, cost-efficient, visually pleasing, environmentally friendly and maintainable".^[2] As part of sustainable development, it pays close attention to preserving limited resources, reducing waste, and preventing air, water and soil pollution. Compost, fertilization, integrated pest management, using the right plant in the right place, appropriate use of turf and xeriscaping (water-wise gardening) are all components of sustainable landscaping.

Sustainability can help urban commercial landscaping companies save money.^[3] In California, gardens often do not outweigh the cost of inputs like water and labor. However, using appropriately selected and properly sited plants may help to ensure that maintenance costs are lower because of reduced inputs.

• Long-lasting
• Reduced water usage and no surface runoff or puddles
• Minimal use of fertilizers and pesticides
• Use of green waste
• Conservation of energy and resources^[4]

Sustainability issues for landscaping include:

• Carbon sequestration
• Climate change
• Water conservation
• Energy usage

Non-sustainable practices include:

• Consumption of non-renewable resources
• Greenhouse gas emissions

Some of the solutions are:

• Reduction of stormwater run-off through the use of bio-swales, rain gardens and green roofs and walls.^[5][6][7]
• Reduction of water use in landscapes through design of water-wise garden techniques (sometimes known as xeriscaping)^{[8][9][10][11]}
• Bio-filtering of wastes through constructed wetlands^[12]
• Irrigation using water from showers and sinks, known as gray water^[13]
• Integrated Pest Management techniques for pest control
• Creating and enhancing wildlife habitat in urban environments^[14]
• Energy-efficient garden design in the form of proper placement and selection of shade trees and creation of wind breaks ^[15][16]
• Permeable paving materials to reduce stormwater run-off and allow rain water to infiltrate into the ground and replenish groundwater rather than run into surface water^[17][18]
• Use of sustainably harvested wood, composite wood products for decking and other garden uses, as well as use of plastic lumber^[19]
• Recycling of products, such as glass, rubber from tires and other materials to create landscape products such as paving stones, mulch and other materials^[20]
• Soil management techniques, including composting kitchen and yard wastes, to maintain and enhance healthy soil that supports a diversity of soil life
• Integration and adoption of renewable energy, including solar-powered lighting^[21]
• Development of lawn alternatives^[22] such as xeriscaping,^[23] floral lawns,^[24] and meadows.^[25]

One step to garden design is to do a "sustainability audit". This is similar to a landscape site analysis that is typically performed by landscape designers at the beginning of the design process. Factors such as lot size, house size, local covenants and budgets should be considered. The steps to design include a base plan, site inventory and analysis, construction documents, implementation and maintenance.^[2] Of great importance is considerations related to the growing conditions of the site. These include orientation to the sun, soil type, wind flow, slopes, shade and climate, the goal of reducing irrigation and use of toxic substances, and requires proper plant selection for the specific site.

Sustainable landscaping is not only important because it saves money, it also limits the human impact on the surrounding ecosystem. However, planting species not native to the landscape may introduce invasive plant species as well as new wildlife that was not in the ecosystem before. Altering the ecosystem is a major problem and meeting with an expert with experience with the wildlife and agriculture in the area will help avoid this.^[26]

Mulch may be used to reduce water loss due to evaporation, reduce weeds, minimize erosion, dust and mud problems. Mulch can also add nutrients to the soil when it decomposes. However, mulch is most often used for weed suppression. Overuse of mulch can result in harm to the selected plantings. Care must be taken in the source of the mulch, for instance, black walnut trees result in a toxic mulch product. Grasscycling turf areas (using mulching mowers that leave grass clippings on the lawn) will also decrease the amount of fertilizer needed, reduce landfill waste and reduce costs of disposal.^[27]

A common recommendation is to add 2-4 inches of mulch in flower beds and under trees away from the trunk. Mulch should be applied under trees to the dripline (extension of the branches) in lieu of flowers, hostas, turf or other plants that are often planted there. This practice of planting under trees is detrimental to tree roots, especially when such plants are irrigated to an excessive level that harms the tree. One must be careful not to apply mulch to the bark of the tree. It can result in smothering, mould and insect depredation.

The practice of xeriscaping or water-wise gardening suggests that placing plants with similar water demands together will save time and low-water or drought-tolerant plants would be a smart initial consideration.

A homeowner may consider consulting an accredited irrigation technician/auditor and obtain a water audit of current systems. Drip or sub-surface irrigation may be useful. Using evapotranspiration controllers, soil sensors and refined control panels will reduce water loss. Irrigation heads may need readjustment to avoid sprinkling on sidewalks or streets. Business owners may consider developing watering schedules based on historical or actual weather data and soil probes to monitor soil moisture prior to watering.^[2]

When deciding what kind of building materials to put on a site it is important to recycle as often as possible, such as for example by reusing old bricks.

It is also important to be careful about what materials you use, especially if you plan to grow food crops. Old telephone poles and railroad ties have usually been treated with a toxic substance called creosote that can leach into the soils.

Sustainably harvested lumber is available, in which ecological, economic and social factors are integrated into the management of trees used for lumber.^[28]

A river with functional (flood preventing) engineering (in Houston, Texas)

A canal design focused on esthetical landscape architecture (in Stockholm, Sweden) for comparison.

Landscape engineering is the application of mathematics and science to shape land and waterscapes. It can also be described as green engineering, but the design professionals best known for landscape engineering are landscape architects. Landscape engineering is the interdisciplinary application of engineering and other applied sciences to the design and creation of anthropogenic landscapes. It differs from, but embraces traditional reclamation. It includes scientific disciplines: agronomy, botany, ecology, forestry, geology, geochemistry, hydrogeology, and wildlife biology. It also draws upon applied sciences: agricultural & horticultural sciences, engineering geomorphology, landscape architecture, and mining, geotechnical, and civil, agricultural & irrigation engineering.

Landscape engineering builds on the engineering strengths of declaring goals, determining initial conditions, iteratively designing, predicting performance based on knowledge of the design, monitoring performance, and adjusting designs to meet the declared goals. It builds on the strengths and history of reclamation practice. Its distinguishing feature is the marriage of landforms, substrates, and vegetation throughout all phases of design and construction, which previously have been kept as separate disciplines.

Though landscape engineering embodies all elements of traditional engineering (planning, investigation, design, construction, operation, assessment, research, management, and training), it is focused on three main areas. The first is closure planning – which includes goal setting and design of the landscape as a whole. The second division is landscape design more focused on the design of individual landforms to reliably meet the goals as set out in the closure planning process. Landscape performance assessment is critical to both of these, and is also important for estimating liability and levels of financial assurance. The iterative process of planning, design, and performance assessment by a multidisciplinary team is the basis of landscape engineering.

Source: McKenna, G.T., 2002. Sustainable mine reclamation and landscape engineering. PhD Thesis, University of Alberta, Edmonton, Canada 661p.

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An example of contemporary landscape engineering and natural resources management related to the Biosphere 2 and seawater farming projects, is the IBTS Greenhouse, formerly the Forest City designed for the Emirate of Ras al Khaimah. The IBTS rests on a thoroughly integrated design with more than 340 different engineering, science and technology disciplines. It was created for desert greening of hot, arid deserts and optimized for fresh water production from saline, or brackish water. The Integrated Biotectural System is based on a wetland, more specifically a mangrove eco-system designed for food and fodder production of 80tons per hectare and year, also called mariculture. The atmosphere inside the IBTS is turned into a potent water source and harvested with a combination of condensation utilities which makes it a more energy efficient desalination facility than industrial plants. It can produce 500.000m3 of distilled water per day while reclaiming 1000ha of hot arid desert lands. The electricity for the desalination is produced by an on-site forest of micro wind turbines located on the same footprint. These numbers are important because the performance data of for-profit engineered landscapes like wetlands for wastewater treatment or agro-ecological farming sites distinguishes technically feasible from financially and ecologically beneficial projects.

The IBTS is an example for sustainable landscape design that reclaims and recreates productive ecosystems including seawater farming, aquaculture, farming, forestry and residence for a human population. It has become feasible because of the design of a Bedouin Greenhouse-shape, automatic construction and maintenance of the vast membrane Sky-roof. The up-front and operational cost could thus be reduced so far that entire landscapes can be covered permanently, not in a common greenhouse fashion, but with an architectural structure that allows for a real-size forest and urban development below the Sky-roof.

The inherent concepts of the IBTS can be used to engineer, terra-form and activate deserts and other landscapes with harsh conditions. In 2015 the governor of Alaska received an offer for a fully self-sufficient multi-residence housing project based on the concepts developed for the IBTS project and adopted for arctic climate by the developer TS Prototype-Creation.

The father of the first irrigation engineering degree in the Americas was Louis George Carpenter (March 28, 1861 – September 12, 1935) He was a college professor and later the Dean of engineering & physics at Colorado State University formerly known as the Colorado Agricultural College.^[1] He was also an engineer, mathematician and an irrigation and consulting engineer.^[2][3]

It was there where Carpenter began the first organized and systematic college program for irrigation engineering starting in 1888. Those completing such instruction were awarded a bachelor of science degree in irrigation engineering.^[4][5][6]

Carpenter was one of the foremost leading experts on irrigation systems. During his life he investigated irrigation systems not only in North America but also in Canada and Europe. This led to his engineering consulting and water law. He became Colorado's state engineer which he held for several years while still teaching.^[6] Carpenter was involved in not only in irrigation engineering but consulting on hydraulic construction projects and the problems associated with such projects.^[6][7]

• Geotextile
• Hard landscape materials