Stop logs are long rectangular boards or beams that are placed on top of one another and then dropped into pre-made slots inside a weir, gate or channel. It is a hydraulic engineering control element and is used in a floodgate to control and adjust the level of water or the rate of flow in a canal, river, or reservoir. They may be manufactured from various materials including steel and composites.
They are very often used to temporarily stop or block the flow of water through a canal or spillway to allow routine maintenance. Sometimes they may be used for longer periods, for instance, when an area of land such as a field is flooded and stop logs are being used in smaller gates to control the depth of water in the field. They can be left in and adjusted during the time that the field is flooded.
By adding or removing individual stoplogs, the operator of a gated structure has the ability to control the water level in a given channel. Gates may contain more than one log and can make use of one or more logs. The logs are lowered horizontally into a space between two grooved piers. Much larger gate structures make use of multiple bays in which stop logs can be placed to control the flow rate of the water through the structure.
Due to the stop logs or boards being subjected to high rates of water flow, they will eventually show signs of wear and will begin to leak. As individual ones age they are replaced with new ones.
Smaller stoplogs that are designed for use by a single individual are sometimes called hand stops. They are used to control water flow in such places such as ditches and rice fields.
They provide an economical means for isolation duties and weir applications where a single piece stop gate would prove too heavy to lift, or where multiple door sections are required.
Stop logs may be made from a variety of materials. Stainless steel stop logs with a sealing mechanism of EPDM (Ethylene Propylene Di Methyl) are suitable for use in most water including sewage and effluent treatment plants.
The general standard size range is anything from 1000mm square up to 2000mm square, however larger or smaller sizes are available, and assemblies are generally built to the customers requirements.
A typical log will be manufactured using a composite sandwich construction comprising of a lightweight rigid cellular core, with a fully welded steel box section between two other skins of rigid compressed composite plastic, which is asbestos free, rigid, non toxic and ultra violet stabilised.
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