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