At what depth is the water?
Every person who wants to dig a well,wonders how deep the water lies on his site. After he determines the place where a well is drilled or a well is dug, it will be necessary to determine the approximate depth of the groundwater.
Determination of depth by the aneroid barometer
The most popular such determinants arebarometer-aneroid and exploratory drilling. For an accurate determination, in addition to a barometer, you need a neighboring well, which should be located near your site.
Depth is determined by the difference in atmospheric pressure. If the water is closer to the surface, then the pressure on the aneroid will increase in the proportion of 0.1 mm. per 1 meter of water occurrence.
An example of how to determine at what depth the water is in the barometer-aneroid:
- water in the well of the neighbor lies at a depth of 3.5 m;
- The atmospheric pressure at this well was 751.4 mm;
- The atmospheric pressure at your intended site for the well is 751 mm;
- the difference was 751.4 mm. - 751 mm. = 0.4 mm. mercury column;
- if the pressure in your area was lower by 0.4 mm. gt; st., then the water here is 4 meters deeper than 3.5 m. + 4 m. = 7.5 m.
This method of determining the level of occurrenceGroundwater is only accurate when the aquifers are horizontally distributed. If the water streams are inclined, which is typical for mountainous terrain, then necessary corrections are made, which also have approximate values.
What can the plants suggest?
At all times in the search for water, great importance was attached to vegetation, which indicated the proximity of groundwater:
- In those places where there are extensive thickets of mother-and-stepmothers, there is a high probability of shallow water occurrence.
- Plums, cherries and apple-trees grow poorly and quickly dry up if ground waters are located closer than 3 meters from the surface.
- If the plane tree grows far from an open water source, this indicates that under its roots there flows an underground river.
- Oaks come across in places where there is a high groundwater table. Once they grow there, where the water veins intersect.
- Alder with a willow are feeling well above the aquifers, bending towards its current.
- For the Chuvashes, the index of the near-lying water always served as sorrel.
Plants not only indicate the place for the well, but also "report" to us by their presence, at what depth the water:
- under cane water is at 1.5-3 meters;
- under the reeds - 1-2.5 meters;
- under wormwood - 3,5-5,5 meters;
- under sarsazanom - no more than 3 meters;
- under the cemetery - 11-24 meters;
- under the yellow alfalfa - 1,5-2 meters;
- under a black poplar - not deeper than 3 meters.
The method of test exploratory drilling is already accurateIt will show how deeply the water layers lie. But due to the fact that this is the most costly method, it is used when drilling at a depth of 10 meters. When searching for water at a greater depth, the rates for this method increase sharply.