Tänavakraave

Tänavakraave, often translated as street ditches or roadside ditches, are linear excavations along the sides of roads, primarily designed for drainage. Their main purpose is to collect and convey surface water runoff from the road surface, shoulders, and adjacent areas away from the traveled way. This prevents water from accumulating on the road, which can lead to hazardous conditions such as hydroplaning and can also damage the road structure through saturation and freeze-thaw cycles.

These ditches are typically constructed with sloped sides and a channel at the bottom. The slope helps to direct water flow towards the ditch, while the channel ensures efficient conveyance. The depth and width of a tänavakraave can vary depending on the expected volume of runoff, the soil conditions, and the local climate. In some cases, they may be vegetated with grass or other plants, which can help to filter pollutants from the water and stabilize the ditch banks. In other instances, they might be lined with concrete or other materials to prevent erosion and increase flow capacity.

The effective functioning of tänavakraave is crucial for maintaining road safety and longevity. They are an integral part of a road's drainage system, working in conjunction with other elements such as culverts and storm drains. Regular maintenance, including clearing debris and sediment, is often necessary to ensure they remain functional and prevent blockages that could lead to flooding.