2. MATERIALS AND METHODS
2.1 Locale of the Study
This study was conducted in a 2 km long strip of Turag river (Figure 1(a) and Figure 1(b)) which started from
Tongi bridge following the river parallel to the Ashulia road. The average width of the river along this section is
15-20 meters; average depth during wet season is 4-6 meters and during dry season 2-4 meters.
2.2 Sources of Data
The sources of data are divided in to two categories. The data which were collected from the field or study area are
called the primary data. Primary data were collected by the interviewing the people of study area and/or by making
survey on a topic of the study. The secondary data are the data which were collected from any books, journals,
previous research paper or any other document which contain the topics related to the study.