Windbreaks for Rural Living
Windbreaks for Rural Living
Author(s): Bruce Wight, Teresa K. Boes, James R. Brandle, Publication #EC 91-1767X
In many parts of the United States, the constant force of the wind exaggerates daily weather conditions and can make living in these areas seem unbearable. A well-designed windbreak around the home, ranch, or farmstead slows the wind and improves the overall environment. Farm and ranch windbreaks conserve energy, provide snow control, improve working and recreational environments, enhance wildlife populations, provide visual screening and dust control, and increase the production of various wood and food products.
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Well-designed windbreaks can cut energy costs as much as 20 to 40 percent. Individual savings depend on local site and climatic conditions, the construction quality of your home, your living habits and the design and condition of your windbreak.
Local wind conditions affect the amount of energy needed to keep a home comfortable during cold winter months. Unprotected buildings, buildings with poorly fitted doors and windows or frequently opened doors, and buildings in areas with high average wind speeds coupled with low average temperatures are left vulnerable to winter·s extremes. Windbreaks reduce the force of the wind on the exterior surfaces of buildings and thus the amount of cold air that enters the home.
In the summer, the inside and outside temperatures of a home may be very similar. Usually, this means that the reduction of hot air entering the home provides only minimal savings in home cooling costs. However, in areas where hot winds are common and most homes are air-conditioned, a reduction of hot air infiltration into the home can reduce air conditioning demands and likewise energy consumption. Additionally, trees provide significant evaporative cooling and may lower the local air temperature several degrees. Well placed landscape plants, such as shade trees or foundation plantings can provide summer energy savings of 15 to 35 percent.
Winter storms on open and unprotected land can render a farmstead snowbound. A properly placed windbreak can reduce or eliminate snow drifts on driveways, in service areas, and around buildings. Valuable time and energy can be spent on other activities instead of snow removal.
Improved living and working environments
Struggling against the wind makes hard work seem even harder. Protecting working areas around the farmstead or ranch with windbreaks makes tasks such as cutting firewood, working on equipment, or feeding livestock safer and more comfortable.
When winter winds are combined with low temperatures, the resulting windchill may create dangerous working conditions. For example, the cooling effect of a 15 mph wind combined with a temperature of 10 degrees affects your body warmth as much as a temperature of 18 degrees below zero. More seriously, a temperature of minus 20 degrees with a wind speed of 20 mph equals a windchill of -67 degrees, cold enough to freeze exposed flesh in less than a minute. A moderately-dense windbreak will reduce the 20 mph wind to approximately 5 mph out to a distance of
5H (H = effective height of the windbreak), still very cold but not nearly as dangerous (Table 1).
A farmstead windbreak can improve living conditions by screening undesirable sights, sounds, smells, and dust. Reduced wind speed on the leeward side of a windbreak helps reduce the odors and dust carried from upwind livestock corrals, feedlots. fields, and roads. Some odors are absorbed by the plants within the windbreak while others may be masked by the more desirable smells of aromatic leaves or flowering shrubs.
Windbreaks reduce traffic noise from nearby roads and highways by deflecting sound off of large branches and tree trunks and by absorbing sound with leaves, needles, twigs, and smaller branches. In addition, trees and shrubs can mask undesirable noises by creating more desirable sounds such as the rustling of leaves or the singing of birds attracted to the windbreak.
Garden and recreational environments
A home garden not only provides healthy, homegrown produce but saves money and brings pleasure to its caretaker. Locating the family garden within the sheltered zone of a windbreak improves the yield and quality of its contents. Lower wind speeds reduce damage to tomatoes, peppers, leaf lettuce, peas, beans and other garden vegetables. Bee activity is increased, resulting in more complete pollination and fruit formation. The moderation of the microclimate by the windbreak results in the early maturity of many crops such as asparagus, tomatoes, sweet com, cucumbers, and melons. Landscape plants and flower gardens also benefit from protection against hot, dry, summer winds.
Recreation is an essential part of family life. Popular activities such as a picnic or barbecue in the backyard, playing ball with children, or working in the garden, are far more enjoyable behind the shelter of trees. The very presence of various trees and shrubs on a ranch or farmstead attracts native wildlife, and in tum, can promote a greater awareness and understanding of nature by the entire family. Windbreak protection enriches the comfort and enjoyment of outdoor activities.
By including a greater diversity of food types and habitat in your windbreak you will attract a greater variety of birds and animals to your backyard. By selecting species that will provide benefits in early spring and late fall, you provide a rest area for many migrating birds.
Products from the windbreak
In addition to providing protection from the wind, ranch and farmstead windbreaks can provide posts, poles, rough lumber, and firewood. These products may be useful on the ranch or farm. or may be sold for additional economic benefits.
In some situations and on sites with deep, well-drained, and fertile soils, high-quality timber may be incorporated into the windbreak design. Species such as walnut, oak, and pecan can be grown in many areas. Harvesting wood products from the windbreak requires careful management and you should seek technical assistance from a forester. Remember, it is the overall structure of your windbreak that provides protection against the wind and it must be maintained in order to gain the benefits from your windbreak.
Planting fruit and nut trees on the leeward side of a windbreak provides another opportunity for harvesting produce from the windbreak. These products are suitable for home use and possibly for sale. A windbreak creates an excellent environment for a bee operation. which in tum provides pollinators for vegetables and fruit trees and honey for home use or sale.
Designing your windbreak
Understanding windbreak benefits and how they are derived can help you in designing one to meet your particular needs. The primary effect of a windbreak is the reduction in wind speed in adjacent areas. Within these areas, the reduction in wind speed creates zones of protection where the microclimate is improved. For multiple-row, farmstead windbreaks the zone of maximum protection lies approximately 2 to 7H to the leeward side of the windbreak (H equals the mature height of the windbreak). Additional protection is found from 1 to 3H to the windward side. The goal in designing windbreaks is to take advantage of these zones of protection to achieve your objectives.
A ranch or farmstead windbreak needs to provide maximum protection to the major buildings and the living and working areas of your farm or ranch. Ideally. the windbreak row with the tallest tree species should be approximately 2-5H from all primary objects or areas needing wind protection. In regions needing both wind and snow protection. the most windward row needs to be 100 to 200 feet from the areas needing protection in order to provide room for snow drifts. Areas and objects more than lOH from the windbreak will receive little protection from the wind.
Once the site of the windbreak is determined. the soils need to be examined. For the best windbreak, choose trees and shrubs suitable for your soil and climate conditions. Species native to your area are usually the best choice. Include a variety of species and at least one or two tall tree species to provide maximum wind protection for the site. By using a mixture of deciduous trees, conifers, and shrubs, the windbreak will provide better protection all year and will lessen the chance of insects or diseases damaging the entire windbreak.
A basic windbreak will reduce wind speed, but a personalized, multiple-use windbreak designed to consider wildlife enhancement, and/or fruit, nut, and wood production will provide additional rewards. The unique attributes of some species provide accents in windbreaks that are especially pleasing when visible to the landowner. Consider what you want your outdoor living area to look like and add species that have flowering, fruiting, form, color, or texture characteristics which appeal to you. Enhanced aesthetic quality and a more natural look can be achieved by using curved rows or adding clumps of trees or shrubs to the planting.
Throughout the United States, strong winds can make living in rural areas difficult. Strategically planted trees and shrubs will provide protection against the wind and will diminish both its direct and indirect effects upon people, plants, property, and animals. Windbreaks enhance the quality of life on ranches and farms and add to the value of the property.
A windbreak providing only wind protection is fairly simple to design, but the complexity increases when including additional benefits such as snow control or enhanced wildlife habitat. The requirements and objectives of the ranch or farm owner will always determine the parameters of the best windbreak design to use.
For additional information, see other guides in this series or contact your local Cooperative Extension office, the Soil Conservation Service, or State Forestry agency.