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Technical Performance Evaluation of Boyra Deep-tubewell – a Case Study

Dr. M. H. Ali
SSO
BINA

Abstract/ Executive Summary:

Two years field study was conducted on Boyra deep tube-well (DTW) irrigation system to evaluate the performance of the DTW. Conveyance efficiency was found significantly high (42.6%), which was mostly due to seepage through the porous banks, spilage and leakage through poorly sealed outlets. Application efficiency was found 89.35%. The average seepage and percolation loss from paddy field was found 1.5 cm/d. The DTW was under-utilized. Measures such as compaction or lining the channel, reducing the channel length, and providing freeboard of the channel may reduce the high conveyance loss. Similarly, measures for reducing on-farm water loss such as compaction of the boarder, and organic manuring in the field may provide good results, which will contribute to increase conveyance efficiency, and thus will reduce input water cost. This incentive will help to increase command area under the deep tube-well.

Keywords: Deep Tube-Well, Performance, Water-loss

Location: Mymensingh

Start Date: 01-01-1999

End Date: 31-12-2000

Program Area: Crop-Soil-Water Management

Non-commodity: Performance

Objectives:

To evaluate the performance of the Boyra deep tube-well.
To find the causes of low irrigation efficiencies and render suggestions for improvement.

Methodology:

The following efficiency indicators were studied: pumping plant efficiency, conveyance efficiency, seepage loss, channel density, application efficiency.

Pumping plant efficiency

Pumping plant efficiency (E_pp) is calculated as:

E_pp = (Output horsepower )×100/ (Input horsepower)

= (water horse power )×100/ (Input horse power)

= [{(Q × w) × H}/550] ×100/ (Input horsepower) ………………(4.9)

where,

Q is the discharge rate (cfs)

w is the density of water (1b/ft³)

H is the head of water (ft) [ here, head indicates the velocity head]

‘550’ is the factor to convert ‘ft-1b/s’ to horse power

In SI unit, the above formula can be expressed as:

E_pp = (Water power )×100/ (Input power)

= [(Q × 9.81 × H) ×100]/ (Input power) ………………………(4.10)

Where,

‘Input power’ in Kilowatt

Q = discharge rate (m³/s)

H = head of water (m)

Conveyance efficiency

Conveyance efficiency (E_c) means the percent of the water reached the field plot on the basis of water diverted and is calculated as:

E_c = (water reached to the plot) × 100 / (water diverted from the source)

Water application efficiency expresses the percentage of irrigation water contributing to root zone requirement. It indicates how well the irrigation system can deliver and apply water to the crop root zone. Hence, the application efficiency takes into account losses such as runoff, evaporation, spray drift, deep drainage and application of water outside the target crop areas. Of these factors, deep drainage and runoff are probably the largest causes of inefficiency and are generally due to over watering. In broad terms, application efficiency is the percentage of water delivered to the field that is ready for crop use. As the application efficiency is a measure of how efficiently water has been applied to the root zone of the crop, this parameter relates the total volume of water applied by the irrigation system to the volume of water that has been added to the root zone and is available for use by the crop. Thus, the application efficiency (E_a) is calculated as (Wingginton and Raine, 2001):

E_a = (irrigation water available to the crop) ×100 / (water delivered to the field)

Source of Information: J. of the Institution of Engineers, Bangladesh. Vol. 28/AE, No.1: 33 - 37, (2001)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Conveyance efficiency was found significantly high (42.6%), which was mostly due to seepage through the porous banks, spilage and leakage through poorly sealed outlets. Application efficiency was found 89.35%. The average seepage and percolation loss from paddy field was found 1.5 cm/d. The DTW was under-utilized. To reduce the seepage loss in irrigation channel, measures such as compaction or lining the channel, reducing the channel length, and providing freeboard of the channel may reduce the high conveyance loss.

Knowledge Management: Journal