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Design and Construction of Ground Water Level Indicator for Geo-hydrologic Studies

A.A. Hassan
Agricultural Engineering Division Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh

M.H. AIi
Agricultural Engineering Division Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh

S.H. Bhuiya
Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh

M.S. Ullah
Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh

Abstract/ Executive Summary:

Groundwater resource must be kept in dynamic equilibrium considering the combined effect of withdrawal and recharge. This is why measurement of groundwater level data ofa geo-hydrologic unit is of immense use. III this study, a ground water level indicator (rewind type) was constructed for static water level measurement. The cost of the instrument is cheep enough [or use at farm level. The water table indicator was found to be simple and easy to operate. This instrument has light-weight which is portable for field operations by semi-skilled staff, and hence facilitate to use at agricultural farm for water management and irrigation planning purposes.

Keywords: Design, Construction, Ground water level indicator

Location: Agricultural Engineering Division, Bangladesh Institute of Nuclear Agriculture , P.O. Box 4, Mymensingh

Start Date: 01-01-2002

End Date: 31-12-2002

Program Area: Crop-Soil-Water Management

Commodity: Water productivity

Objectives:

To design and construction of a water level indicator for ground water level measurement.

Methodology:

Principle of water level indicator (WLI) - This is an electromechanical device to measure depth of static groundwater level from ground surface. The measuring electrode can be lowered down in the well by hand driven mini drum. As soon as the electrode comes in contact with water, audio beep sound is generated on the surface. The corresponding depth can be read from the cable. The main components of WLI are: i). Cable ii). Audio alarm, and/or bulb-indicator, meter. For convenient, audio alarm and meter (indicate the presence of water by reflecting the dial) both can be included in water level recorder. Other accessories such as rewind mini drum, battery (for audio alarm) and a stand are required. The rewind drum was made by cutting the 15 cm diameter plastic pipe. Audio alarm was set within the hole of the rewind drum and the drum was closed by PVC plate. At one side (outer side) of the plate, indicating lamp was set and provision was made to replace the battery of the alarming system by opening the plate (through screw system). The stand is made of one-inch diameter GI pipe. The drum was connected to the stand by bearing system. A handle/arm was provided with the stand to rewind the cable in the drum. Indicating lamp indicates whether the battery is functioning or not. A copper load was attached at the end of the cable in order to keep the cable straight. Other material, such as lead may be used to serve the same purpose. A plastic tube was used as housing of the end point of the cable and load, and also to avoid deformation of the cable due to collision with pipe. A hole was made in the upper part of the plastic tube to remove the air when immerged in water. The cable which is graduated at graduated at 10 cm interval released from the drum by moving the handle (arm) of the rewind drum. When the cable gets touch with water, sound is generated by the calling bell. The depth to water level is measured from the cable. It may be mentioned here that the starting or zero point of the graduation should be the end of the cable (i.e. at the load point). The cable may be graduated at 1 cm interval if such precision is needed. When the cable is pulled up, the sound is stopped. One can recheck the level by releasing the cable again.

Source of Information: Bangladesh J. Agri. Engg. 14: (I & 2) 1-7; 2003

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This type of handy water level indicator was found to be simple and easy to operate. It has light-weight and was found to be portable for field operations by semi-skilled staff. Therefore, it can be used and operated as a very handy instrument at agricultural farm for water management and irrigation planning purposes.

Knowledge Management: Journal