Sampling Research Paper Example | Topics and Well Written Essays - 3250 words

Sampling - Research Paper Example 8 - 4 Fine Gravel 4 - 2 0.00 Very Coarse Sand 2 - 1 0.42 Coarse Sand 1.0 - 0.5 12.13 Medium Sand 0.5 - 0.25 63.30 Fine Sand 0.25 - 0.125 21.73 Very Fine Sand 0.125 - 0.063 2.43 Slit/Clay Sample 3 has GI value of 1.8 and the figure for total pores space is 36.8 % approximately. Low GI = Good Drainage Distribution of Particle size and their category Category Diameter (mm) % retained Stones >8 Coarse Gravel 8 - 4 Fine Gravel 4 - 2 0.00 Very Coarse Sand 2 - 1 0.30 Coarse Sand 1.0 - 0.5 6.22 Medium Sand 0.5 - 0.25 84.22 Fine Sand 0.25 - 0.125 9.20 Very Fine Sand 0.125 - 0.063 0.06 Slit/Clay Sample 4 has GI value is 2.67 and the figure for total pores space is approximately 36.5. %. Low GI = Good Drainage Distribution of Particle size and their category Category Diameter (mm) % retained Stones >8 Coarse Gravel 8 - 4 Fine Gravel 4 - 2 0.00 Very Coarse Sand 2 - 1 0.42 Coarse Sand 1.0 - 0.5 1.18 Medium Sand 0.5 - 0.25 45.23 Fine Sand 0.25 - 0.125 51.36 Very Fine Sand 0.125 - 0.063 1.80 Slit/Clay Table 6: SIEVE APERTURE (mm) Sample 1 Sample 2 Sample 3 Sample 4 Example D90 1.10 0.55 0.45 0.4 1.1 D10 0.30 0.19 0.25 0.15 0.35 D50 0.60 0.35 0.3 0.25 0.59 D20 0.40 0.24 0.25 0.18 0.40 3.67 2.89 1.8 2.67 3.12 Porosity % 36 36.4 36.8 36.5 35.5 Conclusion 1. Percent Retained Sample 1 has a maximum percentage retention value of 58.04 under 0.5mm sieve aperture. Sample 2 has a maximum percentage retention value of 63.30 under 0.25mm sieve aperture. Sample 3 has a maximum percentage retention value of 84.22 under 0.25mm sieve aperture. Lastly, Sample 4 has a maximum percentage retention value of 51.36 under 0.125mm sieve aperture. The distribution of the sieve... Sample 1 has the lowest value of percentage passage under 0.25 to1mm sieve aperture. However, from out of the four samples when in 0.125mm, sample 3 got the lowest value of 0.06. It is also notable that under 0.25mm sieve aperture, sample 4 has still high value of percentage passing with a value of 53.17. Sample 1 contains 58.04 % of coarse sand, 13.47% of Very coarse sand, and 24.41% of Medium Sand. Sample 2 contains 63.30 % of Medium Sand, 12.13% of Coarse Sand and 21.73% of Fine Sand. Sample 3 in almost all of the samples were Medium Sand with percent retained value of 84.22%. Lastly, Sample 4 is a combination of Medium Sand, 45.23%, and Fine Sand, 51.36%. Based from the D10 values, Sample 1 has 0.30, sample 2 has 0.19, sample 3 has 0.25, and lastly, sample 4 has 0.15. All of the samples are in fine sand except for sample 1 which is classified as medium sand. This means that sample 1 has the higher hydraulic conductivity which means that there is more open area for the flow of water. It has been found out that the values of the Porosity % of the four samples were too close to each other as evidenced by the value of 36, 36.4, 36.8, and 36.5. It is notable that sample one has the lowest value of porosity which means that it has very small space for the water to pass through.