Bench Slope

Calculate the depth of cut for a 4 m wide reverse sloped bench terrace on a 15 degree slope. It can be calculated by the following equation. The conversion of land into bench terraces over a period of time is referred to as gradual bench terracing.

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This is the area in benches or flat strips which is used for cultivation.

Bench slope. The requirements of this appendix apply when the design of sloping and benching protective systems is to be performed in accordance with the requirements set forth in 1926 652 b 2. Double benching or triple benching is used where the inter ramp slopes angles are steep enough that single benching would result in an overly flatten slope. Two types use an unsupported vertically sided lower portion with maximum depths of 8 feet and 12 feet and the three remaining types include single bench excavation simple slope short term and multiple bench excavation. The requirements of this appendix apply when the design of sloping and benching protective systems is to be performed in accordance with the requirements set forth in 1926 652 b 2.

Orchard bench terraces narrow width terraces about 1 m for individual trees. Benches can be of different origins and created by very different geomorphic processes. Net area per ha. Width of bench tan 0.

Distress means that the soil is in a condition where a cave in is imminent or is likely to occur. They include trench shields boxes shoring and of course the old reliable sloping or benching. Actual slope means the slope to which an excavation face is excavated. Bench terraces are classified depending upon the slope of benches.

Specifications for sloping and benching when used as methods of protecting employees working in excavations from cave ins are provided in this section. For example if the inter ramp slope is 50 and the bfa is 70 then the corresponding calculated catch bench width would be 2 4 metres to achieve the 50 ira. This figure illustrates the types of excavations made in type a soil. This translates to a 0 75h.

Actual slope means the slope to which an excavation face is excavated. Tangent of the slope angle rh. 1v incline and is shown below. The maximum height of the vertica l lower portions 3 5 feet.

In geomorphology geography and geology a bench or benchland is a long relatively narrow strip of relatively level or gently inclined land that is bounded by distinctly steeper slopes above and below it. 4 x 0 05 0 2 net area. For combination slope bench systems in type a soil and a trench depth of less than 8 feet the steepest maximum allowable slope is 53 degrees from the horizontal. Actual slope means the slope to which an excavation face is excavated.

However the method that appears to be the simplest to understand and use sloping and benching often results in citations for non compliance because the slope or bench is improperly cut or sloped. This geomorphology article is a stub you can help wikipedia by expanding it. These are also referred to as intermittent terraces and step terraces.