This is a large sample of gravel anti-filter how this project count
Visual inspection of the slope of the distance from the clay layer is equal to the thickness of the gravel layer, that is 200mm, so even if it came out scattered Simple function. Also, I used a simple method is to draw in CAD, fill, measure the area, area by length, the volume came out
Lack of slope and total length, can not accurately calculate the amount of engineering. Approximate estimates of cross-sectional area, then only a few simple graphics: clay tamping (rectangular), coarse gravel (trapezium), gravel and gravel (zoned plus parallel quadrilateral), geotextile (four sections)!
