11/8/2022 0 Comments Dig dug arrangement wiki![]() It has the effect of causing sand to accumulate upstream from the dam. Terraces in Morocco Source : /9354Ī sand dam is a small dam that is constructed most often in a seasonal or intermittent water course. Thus, 300 km of terraces were dug in two years. On the specific video on this subject (enter "terraces" in the search box) shows a project carried out in forty communes together, where the inhabitants joined forces to create terraces on the cultivated lands. These projects must therefore be carried out at community or village scale. ![]() Dig dug arrangement wiki full#A single person needs a full day to dig about ten metres. This technique is used on over a million hectares in Tunisia.ĭigging terraces is however a huge undertaking. The principle is the same as for the stone barriers : the terraces form an obstacle to the water flow and thus limit erosion and encourage infiltration. The terraces are about thirty metres apart. This method is effective for rainfall of less than 800 mm.Ī terrace is a ditch 70 cm deep with an earth collar that follows the contours of the land. Cereal or forage production can increase by 20% when manure is added. Low stone walls about 25 cm high are build perpendicular to the slope. This technique is suitable for gentle to medium slopes in a sandy-clay or gravelly soil. It involves slowing down the water runoff to limit erosion and encourage infiltration. Stone barriers have the same aim and action principle as the half-moons. This method is particularly useful in hardened, unproductive degraded soils, as they retain the runoff water and make the land fertile again.īy applying this method with the addition of stone barriers (see next paragraph), about 800 kg of grain per hectare can be expected.Ĭost : Also about €75/ha 6) Stone barriers This method involves digging holes about 30 cm deep at regular intervals which are then filled with compost or manure. If manure is added, a production of one tonne of sorghum grain per hectare can be expected. ![]() The effects make themselves felt in the first season. This method is effective for rainfall of less than 600 mm. Poor soils produce better results when the half-moon system is used. Compost or fertiliser is spread to improve soil fertility. The half-moons are laid in staggered rows with four metres between them. The downstream side of the earth collar thus created can be strengthened with pebbles. Earth from cuttings is laid on the downstream edge of these basins. Half-moons are semi-circular basins 2 to 6 m in diameter that are dug on gentle slopes (<3%) to retain the water. These are the main methods currently used. In addition, these techniques encourage the water to infiltrate the soil, which is very beneficial in regions with insufficient rainfall. Preventing this phenomenon is a simple way of increasing the yield of cultivated land considerably. When rainfall causes erosion, the upper layers of the land - the most fertile - are carried away. Mainly growers in arid areas where the rainwater does not infiltrate the soil and/or damage the land. ![]() This involves fairly simple soil arrangement methods that encourage the water to infiltrate the soil to increase its fertility and limit erosion. ![]()
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