Agricultural pond can be mitigated flood by reservoir effect. Drinking water can be stored in the dry season.
The secret of watertight sealing
Interlocking of large and small particles is
the basis of water sealing (not clay).
Compared to clay of the same little size, the
gaps of sandy soil are smaller and
compressive strength is stronger than clay.
. It protects for uneven sink.
Japanese view of religion I'm doing my best,so please help me,ancestors.
Thank you for your kindness.
I hope that whole family will continue to be healthy.
I will keep our ancestors history and maintain the
grave by my family.