1. 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

2. Morphometric features of Umiam reservoir

3. (a) Bay (b) Lentic sector

4. 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.

5. 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.

6. Table: Physico-chemical parameters of Umiam reservoir water during different season

7. Fig: Monthly variation in water transparency

8. Fig: Sediment texture of Umiam reservoir

9. Chemical characteristics of sediment in Umiam reservoir during different seasons

10. Primary production in Umiam reservoir during different seasons of the year

11. Table : Diversity of zooplankton in Umiam reservoir

12. Table : Diversity of phytoplankton in Umiam reservoir

13. Conti…

14. Total density of plankton in Umiam reservoir during different seasons

15. Contents of Residues of different pesticides (ug/l) in water samples collected from Umiam lake

16. Important Isolates

17. Fig: Solid wastes accumulate in the lotic sector Fig: Pollution from river Umkrah

18. thank you