Well design means taking the details obtained from the drilling of the well in order to plan for the most effective well construction. Both in terms of water quantity and water quality The main principle of design At the insertion of the pipe and filter pipe To be the right size and where it should be located, for example, the filter pipe must be at least 2/3 of the thickness of the water layer. The position of the filter pipe must be in line with the water layer. In case the well is drilled through the saline layer It must determine how to seal or waterproof the saltwater not to mix with fresh water. And come into the pond, these, etc., as a reference to the actual design of the pond.
1.1 Boring the well with a 15-inch drill bit to insert the 8-inch pipe and filter pipe.
1.2. Dig the well down to 350 feet and let the gravel and sand fill up to 900 feet. If not full, then find soil or sand from
The exterior is added until it reaches a level of 350 feet.
1.3. Fill the cement in this 15 inch cored well from 295 feet to 350 feet to prevent saltwater from entering the ground floor into fresh water.
(The distance from 295-307 feet, which is the freshwater layer, is filled with cement. To make the filling more effective)
1.4. Insert the 8-inch pipe from the soil surface down to a depth of 270 feet from 270-290 feet. Put the filter pipe of the same size using the pipe.
Filter the gap size 50/1000 inches from the level of 290-295 feet, which is the level of cement at the bottom of the well. Insert another piece of pipe of the same size.
Together, the end of the pipe at the bottom is closed.
1.5. Put grit size 1/8 – 1/4 inch around the filter pipe and the casing from 265-295 feet.
1.6. The gap between the pipe and the wall of the well From the surface of the soil to 265 feet, again covered with cement to water the upper salinity into fresh water.
1.7. The total cement used was calculated at 18 tons. The result of making this well appears that when the development of the well was completed, get fresh water on demand
2. Inserting the filter pipe
The casing is made of ductile iron, used in the pond as a permanent wall of the pond and as a housing for the suction head of the groundwater pump.
3. Gravel Packing
It was mentioned earlier that the gap between the well wall and the filter pipe must be surrounded by gravel.
4. Pond development
It is the final work in making the well before pumping out the water from the well. The development of the pond aims to make the pond have more water. 5. Water volume testing.
The well-developed is ready to install the pump. Pumping up water But in practice, should test the amount of water (Pumping test) first to get details about the amount of water to be pumped up. And to find information for choosing the right pump The details of the operation are described in the handbook for testing the amount of water, Kor Por. 8