A Brief Account on Analysis of water & sediment in Umiamlake By Dr. P.K. Ghosh PS & Head (WM) ICAR Research Complex for NEH Region Umiam, Umroi Road, Meghalaya
(a) Bay (b) Lentic sector
Uses of lake • Primarily it meant for Umtru-Umiam hydro-electric project. • There is no organized fishery in this reservoir. • Subsistence fishing by the local people is common. • About 200-250 anglers come to this reservoir daily for fishing. • The common carp, Cyprinus carpio is the predominant sps. • Boating is the main recreation found in this lake.
Procedure • The surface water samples were collected which were analyzed for various parameters like (Temperature, PH, dissolved oxygen, free CO2, total alkalinity, total hardness, total dissolved solids, chloride) • Water transparency was measured using a secchi disc. • Sediment samples were collected using Petersen grab. • The sediment samples were also analyzed for their chemical characteristics like PH, organic carbon, organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium. • Plankton was collected using standard plankton net made of bolting silk cloth. • Pesticide residue is analysed using HPLC.
Table: Physico-chemical parameters of Umiam reservoir water during different season
Chemical characteristics of sediment in Umiam reservoir during different seasons
Primary production in Umiam reservoir during different seasons of the year
Total density of plankton in Umiam reservoir during different seasons
Contents of Residues of different pesticides (ug/l) in water samples collected from Umiam lake
Fig: Solid wastes accumulate in the lotic sector Fig: Pollution from river Umkrah