New bore - What to do next

[shashg]

The dia of bore is 6 inches which I forgot to mention

[saravanakumargcses]

@shashg

We had dug a borewell about 2 years back.Water was struck at around 90 ft.Drilling was done upto 180 ft .Driller refused to drill further.Casing done upto 80 ft.Last month we checked hole depth which is now only 130 ft.Used compressor to flush out silt.But depth remained 130 ft.Static Water level is at 40 ft from the top. The compressor guy tells the yield is more than 15000LPH.What pump spec is ok for the following requirement.
1.To irrigate 4 acres by drip.( Main crop guava and lemon with coconut on the border and may be vegetable intercropping at later stages.).
Head required 130 ft+75 ft=205 ft
Yield Approx 15000LPH.Request experts to guide.

Hi,

A)

The reduction in depth happens over the period of time when the borewell remains unused, mostly due to soil erosion & bore wall collapse. If the casing was upto 160ft you would have noticed this being not happening.

B)

For pump selection;

• Have the manufacturers performance chart
• Estimate your water requirement in liters per day
• Your head will be 130ft + pressure required by drip system
• Select the pump irrespective of stages, which offers your required water at a particular head considering the number of hrs of electricity you get
• You would probably need a 6"pump as they come with 2" delivery. Most drip designs have 2" pipe as main line.

Hope this helps!

Regards,

Saravana Kumar
Greencurrent Solar Energy Systems