Function
Cost
- To intercept the runoff flowing down the slope by an embankment.
General information
- It helps to control runoff velocity.
- The embankment may be closed or open, surplus arrangements are provided whenever necessary.
- Approximate cost for laying contour bund is Rs. 1500/- per ha.
Salient features
- It can be adopted in light and medium textured soils.
- It can be laid upto 6% slopes.
- It helps to retain moisture in the field.
| SPECIFICATION FOR BUND CROSS SECTION | |||||
| Depth of soil (m) | Base width (m) | Top width (m) | Height (m) | Side slope (m) | Area cross section (sq.m) |
| Shallow soils (7.5 – 22.5 cm) | 2.67 | 0.38 | 0.75 | 1.5 : 1 | 1.14 |
| Medium soil (22.5 – 45 cm) | 3.12 | 0.60 | 0.85 | 1.5 : 1 | 1.56 |
| Medium deep soils | 4.25 | 0.60 | 0.90 | 1.5 : 1 | 2.18 |
Situations for various bunding options:
| Bunding options | Soil type | Rainfall (mm) | Slope (%) |
| Contour bund | Light soil | <600 | >1.5 |
| Graded bund | All soils | <600 | 1.5 |
| Bench terraces | Deep soil | >1000 | 6.0 |
| Graded boarder strip | Deep Alfisol and related red soil | >800 | >1.5 |
In-Situ Moisture Conservation Techniques :
| Soil Type | Rainfall | In-Situ Moisture Conservation Techniques |
| Red soil | Low | Dead furrow at 3-6 m interval |
| Medium | Sowing on flat bed and riding later with eventual cultivation | |
| High | Graded border strips | |
| Black soil | Low | Contour cultivation |
| Medium | Dead furrows at 3-6 m interval | |
| High | Graded open furrow (0.2 to 0.3 m3) at 10 m interval across the slope |
| Contour bunding construction | Contour bunding along the slope |
| Contour bunding with Maize cultivation | Contour bunding with Grass |