If you are dealing with a contractor who does not use a GPS tracking system to install the network, use a hand-held GPS device to note the coordinates of the outlets, surface water inlets and structures. It is important to keep the network plan up to date by revising it as soon as the network is subject to modifications or repairs. For the Blocked Drain Kent this is important.
Remember to note on the drainage plan all maintenance or repair operations carried out and modifications made to the network. This ensures that you always have an up-to-date network plan for subsequent inspection and maintenance operations.
At the field
Watch for any signs of erosion of the drainage trenches following rainfall events, especially in the early years. A few days after a heavy rain, inspect the main collectors and side drains for water accumulations or particularly wet areas in the field. These spots can indicate that a drain is blocked and will need to be repaired.
The uniformity of crop growth is another good indication that the drainage network is fulfilling its role. Ideally, the field should drain evenly and produce uniform yields. Be on the lookout for differences across the field in annual crop yields as they can be indicative of problems that may appear more slowly and require repair. Periodically order aerial photos of the farm to have an overview of the state of the network and thus be able to identify any drainage problems.
Point of Blockage
When a drain is blocked, water rises to the surface where the blockage is. The pipe must be dug up there and repaired. Mark potentially problematic areas and ask a contractor with the necessary permits to make repairs as soon as possible, within reasonable limits. If the fields are wet, it is sometimes better to wait for the water to subside before making any repairs to avoid damaging the soil structure.
If pipes contain water for much of the growing season, they may become clogged with tree roots. In a well-designed system, drainage pipes side drains as main collectors are located at least 30 m (100 ft) from trees that like moist soils, such as willow, silver maple, elm, and poplar, and at least 15 m (50 ft) from all other types of trees.
Process of Drainage Cleaning
Some cash crops produce roots that get into and block drainage pipes. The roots of annual crops, such as alfalfa, brome, ryegrass, canola, and sugar beet, usually self-retreat after the crop is harvested. In case of problem:
- Avoid re-cultivating the crop in question,
- Rid the pipes of roots by cleaning with a low pressure water jet,
- Remove the blocked section and replace it with a larger diameter pipe.
Often, silt boxes and catch basins are installed at key points in the system that must be inspected and cleaned annually. Make sure their covers are properly sized and have not suffered any structural damage. These structures should always be kept locked, in order to prevent access to them by unauthorized persons and to prevent them from being damaged.
Be on the lookout for signs of subsidence or washed away soil, which may be indicative of a ruptured drainage pipe and surface water entering underground drains. At the slightest sign of a hole on the surface, repair it immediately to prevent too much sediment from entering the network and reducing its hydraulic capacity