ที่มาของข้อมูล

1) http://primaryscience.ipst.ac.th/?p=257

2) http://pirun.ku.ac.th/~b521010136/important.html

3) http://kmcenter.rid.go.th/kmc16/wichakarn/data/soil_dam.htm

4) https://nutchicha.wordpress.com/%E0%B9%80%E0%B8%82%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%99%E0%B8%94%E0%B8%B4%E0%B8%99/

5) https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%82%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%99%E0%B8%94%E0%B8%B4%E0%B8%99#.E0.B8.82.E0.B8.B1.E0.B9.89.E0.B8.99.E0.B8.95.E0.B8.AD.E0.B8.99.E0.B9.83.E0.B8.99.E0.B8.81.E0.B8.B2.E0.B8.A3.E0.B8.AD.E0.B8.AD.E0.B8.81.E0.B9.81.E0.B8.9A.E0.B8.9A.E0.B9.80.E0.B8.82.E0.B8.B7.E0.B9.88.E0.B8.AD.E0.B8.99

6) http://wapanakron.blogspot.com/