Figure 3.
(a) Schematic diagram and (b) photograph of the bucket filter. The figures between brackets represent the thickness of the layer of sand placed in the bucket and its particle size.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.