A hidden pipe under the ground is carrying black colored water discharged from a textile factory which is located hundreds meter away from the Dao Khanong Canal, and only 1 kilometer from the Chao Phraya river. The pipe can be seen only during low tide.

Dao Khanong Canal is connected to the lower reach of the Chao Phraya river and is one of the famous canals for tourist sightseeing because of the temples, local houses, restaurants, snake farm, and fruit farms.