Types of courts Tennis courts can be divided into outdoor and indoor, and there are a variety of different court surfaces. It will be determined by economic factors. For example, lawn tennis is the most basic outdoor court, but its establishment and maintenance are too expensive, so it is now replaced by artificial courts, which are cheaper and easier to maintain. There is also a popular clay court in Europe, the French Open is such a court. The following is a description of this: the maintenance of grass courts is time-consuming and expensive, so it is less and less common to cross the field. They must have a good drainage system, the picture on the right is a cross section of a standard grass pitch. It used to be 7.5 cm (3 inches) of carefully selected soil, and 15 cm (6 inches) of unimpeded layer. The two surfaces below were non-organized permeable layers separated by stone plates, and the top of the subsoil layer was It is a 44 cm (18 inch) wide drain. The perimeter of the course is constructed of slender durable battens, concrete walls and corners. Cooley Stadium is composed of a combination of nutrient resin and flat coarse-grained rubber plants, and is sprayed with polyurethane, which can penetrate the bottom layer, and is covered with oil. Clay courts require frequent maintenance, and maintenance costs are sometimes expensive. The photo to the right shows a cross-section of a well-built hard court. The layers of its purchase are as follows: 19~40 cm thick surface material, followed by a gravel layer composed of sand, slag or coarse sandstone, then a 12.5 cm (5 inch) permeable layer, and the lower soil layer. 22.5 cm (9 inches) above and below the reference surface is a drain pipe of 7.5 cm (3 inches).
