. I = + S b 0 .3 a where, - land slope (%); a and b are constants = 3 and b =2 for medium and heavy rainfall zones = 2 and b =2 for low rainfall zones Horizontal Spacing in between bunds (H.I) V.I H. I = x 100 S Length of bund per hectare (L.B) 100S 10 ,000 L. B.perha = or V .I H .I Depth of water impounding before the bund (h) h = D*R 500 Contour bunding is a proven sustainable land management practice for marginal, sloping, and hilly land where the soil productivity is very low. It is widely adopted by the ethnic minorities of Nepal who practice the shifting cultivation system of farming.
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Construction. Types of Bund: The different types of bund used in practice are given as under: 1. Contour Bund - The bunds constructed exactly on contour or with permissible deviation from the contour, are called contour bunds. ADVERTISEMENTS: 2. Contour bunding involves laying points of equal elevation along the contour of a sloping field and then constructing a bund, or barrier, along the contour. It is aimed at reducing run-off and increasing water filtration to reduce soil erosion and nutrient loss. If trees are used to strengthen the bund, then it can also provide animal. 1. Spacing of Contour bund: Bund spacing is expressed as the vertical or the horizontal distance between corresponding points on two adjacent bunds. Although the horizontal spacing is useful in determining the row arrangement. Vertical distance is commonly known as the vertical interval or V. I. Contour bunding (or contour bundling), which involves the placement of lines of stones along the natural rises of a landscape, and contour farming. These techniques help to capture and hold rainfall before it can become runoff. They also inhibit wind erosion by keeping the soil… Read More
How contour bunding and other technologies can reduce soil erosion and raise productivity in
Practical No: 1 Design of Contour Bund Aim: Design of contour bund Theory: The design parameters required for contour bunds are Vertical interval Horizontal interval Bund cross-section Earth work due to bunding Height of the contour bund should be enough to store the expected peak runoff for a 10 years recurrence interval. Learn how to construct and maintain live bunds, contour bunds and graded bunds to prevent soil erosion and improve water conservation in this video by Amit Bhatnagar, a soil and water conservation. Contour bunding or contour farming or Contour ploughing is the farming practice of plowing and/or planting across a slope following its elevation contour lines. These contour lines create a water break which reduces the formation of rills and gullies during times of heavy precipitation, allowing more time for the water to settle into the soil. [1] The use of contour bunding is limited by the fact that it is labour intensive and that bunding cannot be implemented during the fallow period of the shifting cultivation cycle, thus it can only be applied on a plot for two years (the cultivation period of the shifting cultivation cycle). Left: Farmer collecting slashed materials for
‘Contour bunding’ preserves soils and boosts farmers’ by 20 in Mali Africa RISING
When they are constructed on the contour of the area, they are called as contour bunds and when a grade is provided to them, they are known as graded bunds. For bunding, the entire area is divided into several small parts; thereby the effective slope length of the area is reduced. When the bunds are constructed along the contours with some minor deviation to adapt to practical situation, they are known as contour bunds. If the bunds are constructed with some slope, they are known as graded bunds. No farming is done on bunds expects at some places, where some types of stabilization grasses are planted to protect the bund.
Terminology. Bunding is a technique that aims to retain water on site, by either creating internal peat dams to impede water movement through the peat body and/or surface bunds to hold back surface water in shallow pools. This family of techniques is typically used when a peatland is persistently dry or there are lots of peat pipes/cracks. It is a process-led approach that encourages active involvement of community people at all stages of technology development. The project worked towards developing a process and methodology in which.
😍 Contour bunding images. Sharing labour to implement contour bunding. 20190207
When the bunds are constructed along the contours with some minor deviation to adapt to practical situation, they are known as contour bunds. If the bunds are constructed with some slope, they are known as graded bunds. No farming is done on bunds expects at some places, where some types of stabilization grasses are planted to protect the bund. 1. Spacing of Contour bund: Bund spacing is expressed as the vertical or the horizontal distance between corresponding points on two adjacent bunds. Although the horizontal spacing is useful in determining the row arrangement. Vertical distance is commonly known as the vertical interval or V. I.
