Mixed Hole System
Mixed hole systems (MHSs) are a type of hole-drainage system that, in contrast to the wider application of conventional hole drains, is individually designed and built to meet specific site requirements and desired performance. They are often a favored solution in conditions where other drainage systems are inadequate and to ensure groundwater should not rise above a certain level. The system consists of a single mixed hole consisting of a variety of different and type of pipes.
The key components of MHSs include two layers made of pipes of different diameters, connected by a special type of sealant to provide full impermeability of the drainage and non-permeability of the soil. The actual construction and layout of MHSs depends on the prevailing conditions and can be tailored to provide the necessary performance for the specific site conditions. Generally, the upper layer of pipes should have the smaller diameter and be placed in the closest proximity to the surface, while the lower layer of pipes should have the largest diameter and run slightly deeper beneath the surface. All of the pipe connections should be securely sealed to ensure that water pressure is maintained and to prevent any seeping of the water through the layers.
The main goal of MHSs is to provide a reliable and efficient means of grounding-level drainage and groundwater control. Such systems can be used to prevent ground water from rising above the desired level, thus allowing for a better control of runoff and groundwater. Furthermore, when designed and installed correctly, MHSs can provide excellent permeability, allowing for the efficient drainage of groundwater and allowing for better infiltration of water into the soil, thus ensuring better irrigation and soil fertility.
Mixed hole systems can be installed using a wide range of materials, from plastic, to clay and concrete. The pipes of various diameters can be selected and installed according to the required system performance and the specific site requirements. Furthermore, depending on the installation of the system, the specific requirements can be made to cater for the hydrological features of each particular site. The MHSs, should also comply with the regulations and guidelines set by the government and local authorities.
In addition to the construction and installation of the MHSs, appropriate maintenance is of paramount importance. This is necessary to ensure a proper functioning of the system and to guarantee that the desired performance can be achieved. It is recommended that maintenance should be regularly carried out in order to check and detect any possible faults or damages that may affect the performance of the system or may even lead to an emergency drainage issue. These maintenance checks must be regularly assured.
To conclude, MHSs are a very useful and reliable system of groundwater control, which have proved to be an effective solution in conditions where conventional drainage systems are inadequate and ground water levels must be kept to a minimum. With the proper design, construction and maintenance, this type of drainage system can provide excellent permeability and proper ground levels, thus the overall performance can be greatly improved.
