Environmental Engineering Reference
In-Depth Information
Sample Analysis
Analyses of Hydrological Factors
Hydrological factors like water temperature, salinity, pH, transparency, dissolved oxygen,
total suspended solids, tidal height and inundation period were analyzed by using following
methods:
Temperature
Water temperature was measured using standard mercury filled centigrade thermometer
having a range from 0ºC to 100ºC (Prabu et al.
,
2008).
Salinity
Salinity of the water was measured by a refractometer (0-100‰, OSK, Japan).
pH
Water pH value was obtained by using a digital pen pH meter (HANNA Instruments,
model HI 98107)
Transparency
Water transparency was observed by dipping a hand held secchi disc (30cm in diameter)
under water. The disc was lowered into water and the depth at which it became invisible was
recorded.
Dissolved Oxygen (DO)
Dissolved oxygen was estimated by using a portable DO meter (HANNA Instruments,
model HI 9142).
Total Suspended Solids (TSS)
Total suspended solids was measured by applying filtration procedure followed Standard
Methods (APHA, 1999).
Tidal Height
Tidal Height for each station was measured monthly by ―glue stick method‖ which is
developed by NHCP (1998).
Inundation Period
Duration of inundation for each station was manually measured by using a stop watch
during spring tide condition in each month as followed by Neckles and Dionne (2000).
Water Table Depth
Water table depth was measured by digging a hole to depth of 1.5m in the centre of each
station. Once the water stabilized in the hole, water table depth was measured from the
surface.
