Openwell

Our Farm at Thenkodipakkam had 3 wells.

One working rectangular well at 15-1 with service and totally dilapidated motor room. Fixed this last year along with building a wall around the Openwell. After reconstructing the motor room, bought a motor from sakthimurugan , pondicherry and got it installed through Molasur Raja

A second partially dilapidated round well at 17-2 was fixed while building the wall around the well at 15-1. Currently as of 2024-03-23, the well is in good condition. Already bought DC motor from RIPS Technology .

As on 2024-03-23 night ordered solar panels from Waaree . These panels and the DC motor will be used to power the solar pump .

A third totally dilapidated well is located at 21-2, nearer to the road at the northen side. Many people suggested it used to be a great well. Not sure how much to judge this opinion. Decided to work on this only after harvesting Casuarina planted in Nov'2022.

Well digging

Digging of well involves two steps.

Detonation

Quote given by Nerkunam chettiar for Detonation are as follows:

Maintenance

Periodic removal of silt from Well needs to be done. The quote given by Nerkunam chettiar as referred by Rajaram is as follows: ₹2000 - rent for equipment including one operators 5*₹750 - for workers 2 working above the well and 3 inside the well. Working hours from 7:00 AM to 1 PM extendable to 1:30. BF break form 10:00 AM. Max 15-20 mins.

General Classification Of Wells

  1. Open wells or dug well
  2. Tube wells

The ancient wells were all open wells. They are constructed by digging large diameter holes in the earth. Open wells are generally open masonry wells having diameters varying from 2 m to as much as 7 m and their depth seldom exceeds 20 m. Their discharge is about 18 m3/hr or about 0.005 cumecs depending upon the depth of water table and nature of soil comprising the aquifer.The wall is known as staining wall or lining wall of the well. The thickness of lining or staining wall varies between 38 cm and 75 cm depending upon the depth of the well. open wells cannot be worked at velocity of percolation more than the critical velocity.

Open wells may further be classified into two types.

Shallow Well

Shallow wells are Open wells which gets its supplies from upper most aquifer only. It is not the depth of the well but the criteria of getting their supplies. Shallow wells get their water from top most layer but deep wells get their supplies from confined aquifers lying below the impervious layers. A ‘shallow well’ might have more depth than a ‘deep well’ and Deep wells are not necessarily deeper than shallow wells.

Deep Well

The deep wells get their supplies from water bearing straws lying below an impervious stratum. The theory of deep wells is based on the percolation of water into the under lying aquifers from out-crops. The out-crop is the exposed area of the pervious layer or aquifer, lying below the impervious layer.

The impervious layer on which deep wells generally rest and draw their supplies from pervious formations lying below the impervious layer, through a hole is known as Mota layer. The term Mota layer is also sometimes known as ‘Matbarwa’ or ‘Magasan’ layer.

The Mota layer is found throughout the Indo-Gangetic plain. The Mota layer may be present as continuous layer or may be in form of local formation.

Source: https://civilengineering.blog/2020/10/04/classification-of-wells/ ↗ https://www.yourarticlelibrary.com/water/wells/open-well-meaning-and-its-types-with-diagram/61045 ↗

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