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Rami Reddy, K. V. S.
- Effect of Crest Height on Flow Characteristics of Semi-Circular Bottom Contraction Weirs
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Authors
Affiliations
1 College of Agricultural Engineering Bapatla (A.P.), IN
2 College of Agricultural Engineering, Bapatla (A.P.), IN
1 College of Agricultural Engineering Bapatla (A.P.), IN
2 College of Agricultural Engineering, Bapatla (A.P.), IN
Source
International Journal of Agricultural Engineering, Vol 8, No 1 (2015), Pagination: 21-25Abstract
Accurate water measurements systems enable accurate accounting of water use, and permit the available water to be supplied at optimum rates to the areas where it is intended to be used. A perfect understanding of some of the primary principles relating to the subject of water measurement is, therefore, necessary for establishing any water measurement system in the canal commands of irrigated agriculture. All the four weir types have enabled creation of critical flow conditions within the throat section, which indicate their suitability for measurement of water in open channels in general. All the four design crest heights (25 cm (Weir-I), 20 cm (Weir-II), 15 cm (Weir -III) and 10 cm (Weir-IV)) are found to be acceptable excepting for 90 per cent submergence level condition. Critical depth (section) has occurred at only one location in the throat section for all the weirs under all possible conditions. The crest height has increased from 10 cm to 25 cm and then location of the critical section has moved towards the upstream side from 1.6 to 0.8 cm, 1.7 to 1.0 cm, 1.8 to 1.1 cm for 24 Ls-1 discharge under free flow, 60 per cent, 75 per cent submergence conditions, respectively. For 18 Ls-1 discharge, crest height has increased from 10 cm to 25 cm, and then location of the critical section has moved towards the upstream side from 7.0 to 3.1cm, 7.1 to 3.3 cm, 7.3 to 3.5 cm under free flow 60 per cent, 75 per cent submergence conditions, respectively. For 12 Ls-1 discharge, crest height has increased from 10 cm to 25 cm and then location of the critical section has moved towards the upstream side from 8.1 to 4.7 cm, 7.1 to 4.9 cm, 8.3 to 5.0 cm under free flow 60 per cent, 75 per cent submergence conditions, respectively. Crest height has increased from 10 cm to 25 cm and then location of the critical section has moved towards the upstream side from 8.4 to 6.0 cm, 8.6 to 6.1 cm, 6.3 cm for 6 Ls-1 discharge under free flow, 60 per cent, 75 per cent submergence conditions due to increased the contact surface and friction and not found for 90 per cent submergence levels for all the four weirs.Keywords
Hydraulic Flume, Semi-Circular Crested Weirs, Characteristics of Semi-Circular Weirs, Open Channels, Point Gauge, Critical Depth, Crest Height, Discharges.
- Performance Evaluation of Reaper-Binder in Rice Crop
Abstract Views :264 |
PDF Views:2
Authors
Affiliations
1 Department of Farm Machinery and Power, College of Agricultural and Engineering, (A.N.G.R.A.U.), Bapatla (A.P.), IN
2 Department of Farm Implements and Machinery Scheme, Agricultural Research Institutes, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad (Telangana), IN
3 Department of Farm Machinery and Power, College of Agricultural and Engineering, (A.N.G.R.A.U.), Bapatla (A.P.)
1 Department of Farm Machinery and Power, College of Agricultural and Engineering, (A.N.G.R.A.U.), Bapatla (A.P.), IN
2 Department of Farm Implements and Machinery Scheme, Agricultural Research Institutes, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad (Telangana), IN
3 Department of Farm Machinery and Power, College of Agricultural and Engineering, (A.N.G.R.A.U.), Bapatla (A.P.)
Source
International Journal of Agricultural Engineering, Vol 8, No 2 (2015), Pagination: 232-238Abstract
Field performance of reaper-binder was assessed in rice crop and compared with manual method of harvesting by sickle at farmer's field under farm implements and machinery scheme during Rabi 2013. The effective field capacity of the reaper-binder was found 0.294ha h-1 with a field efficiency of 67 per cent at an average operating speed of 3.6 kmph compared to 0.025 ha h-1 for manual harvesting. The fuel consumption was found 5.27 l ha-1. Labour requirements for mechanical and manual harvesting were 36 and 176 man-h ha-1, respectively. The harvesting losses for mechanical and manual harvesting were 1.44 and 1.88 per cent, respectively. The cost of harvesting operation was Rs.5500/ha for manual harvesting and Rs.2241/ha for mechanical harvesting. The harvesting cost of reaper binder was reduced by 40.74 per cent compared to manual harvesting method with sickle. The feedback of machine operation was collected by some farmer's at the time of harvesting and the performance of the reaper-binder at the farm was satisfactory.Keywords
Rice, Reaper Binder, Harvesting, Manual Harvesting, Paddy.References
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