Effect of landslope on uniformity of water distribution of sprinklers
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Date
1996
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Department of Land and Water Resources and Conservation Engineering, Kelappaji College of Agricultural Engineering and Technology,Thavanur
Abstract
A study was conducted at Keleppaji College of Agricultural Engineering and Technology, Tavanur to find out the effect of land scope on sprinkler uniformity. A single nozzle sprinkler was used for the study. The study was carried out over an artificial platform. The water distribution pattern for three slopes viz; 12.5 %, 10.0 % and 7.5 % was studied for three riser positions viz; vertical, mid way and perpendicular to the land. Isohytes were drawn for the various positions in wind and no wind conditions for the three slopes. The uniformity coefficient, Cu values were evaluated and the spacing between the sprinklers for good overlap was found out. It is found that the water distribution is decreasing as the land slope is increasing. The perpendicular position was the ideal position for all the slopes. The optimum riser angles for various slopes are found to be 70 7 ‘30’ ‘for 12.5 % slope, 50 42 ‘38’ ‘for10.0 % slope and 40 17 ‘21’ ‘for 7.5 % slope with respect to the vertical position.
The rpm of the sprinkler head for three riser positions was studied. In vertical position the rpm was almost same in all the slopes. It was decreasing as the riser position was changing from vertical to perpendicular in every slope. The rpm was less in wind conditions than in no wind conditions.
The erosivity was also measured. The amount of soil collected for the various positions was evaluated. It was found that the amount of soil loss is increasing with the increase in land slope. It was maximum in vertical position, less in mid way position and least in perpendicular position for all the land slopes.
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170708