Thursday, April 17, 2014
Landscaping: Elevating by Back-filling
Back-filling is a word that I learned here in the Philippines. It is short for the process of elevating a piece of land. The truck drives backwards to the edge of the lower part of the land and then dumps it load. Next it then drives further back over its own load to make it stable for the next dump load.
Flooding is caused by opening a dam in the river nearby, after heavy torrential rain, from the wet monsoon or a typhoon. This is to prevent the river dams will overflow or even will rupture.
The required elevation varies from 50 to 80 cm (average 70 cm), depending on the level of the driveway and the house and bodega outbuilding. We started on March 31st, 2014 and finished on April 4th. A maximum of 5 trucks were used at two days and one day only 2 trucks. A loader was used at each end. One at the origin of the soil and one at the destination.
The truck price was negotiated on the expected volume we would need. My calculation was as follows: area 2767 square m * 0.7 m = 1.937 cubic m. With a truck volume of 15 cubic m, this would require 129 trucks.
However the supplier told me that you need to correct the volume you need because the soil will shrink over time and after raining, such that you have to increase your required volume with 30%. This correction would lead to 1.3 * 129 trucks = 168 trucks. In reality we needed 176 trucks
With this amount of trucks we got the loader at destination for free. The loader was also used to remove plants and trees we had already on the compound and to put them back in the final (new) position.
As you will see in the picture slide show attached here (click the Slide Show button in the upper command line), we started already to plant trees, flowers and other plants. Now it is waiting for the rain to help them grow.
As soon as the rain will come regularly (May) the grass will come automatically, I guess in 3 to 4 weeks it will be all green.