Pollution Control Board, Assam Conservation of River Bharalu, Guwahati Preparation of Detailed Project Report Project Feasibility Report for Sewerage Schemes December 2013 Joint Venture of The Louis Berger Group, Inc. and DHI (India) Water & Environment Pvt. Ltd. i TABLE OF CONTENTS LIST OF KEY ABBREVIATIONS ..................................................................................... 4 SALIENT FEATURES OF THE PROJECT ...................................................................... 5 EXECUTIVE SUMMARY .................................................................................................. 6 1 ABOUT THE PROJECT AREA .................................................................. 7 1.1 Description of Project Area ..................................................................................... 7 1.1.1 Brief History of the Town ............................................................................................................... 7 1.1.2 Geographical Location .................................................................................................................. 7 1.1.3 Climate .......................................................................................................................................... 9 1.1.4 Topography ................................................................................................................................. 12 1.1.5 Drainage Channels ...................................................................................................................... 12 1.1.6 Administrative Divisions .............................................................................................................. 13 1.1.7 Commercial Aspects ................................................................................................................... 14 1.1.8 Industrial Aspects ........................................................................................................................ 15 1.1.9 Educational Activities .................................................................................................................. 15 1.1.10 Cultural Activities ......................................................................................................................... 15 1.1.11 Religious Activities ...................................................................................................................... 15 1.1.12 Socio-Economic Status ............................................................................................................... 15 1.1.13 Town Management ...................................................................................................................... 16 1.1.14 Cost of Land in and around Guwahati ......................................................................................... 17 1.1.15 City Development Plan ................................................................................................................ 17 1.2 Population within the Project Area ........................................................................ 17 1.2.1 Ward Wise Population ................................................................................................................. 18 1.2.2 Slum Wise Population of the last 5 Decades .............................................................................. 20 1.2.3 Population Projections as per the City Master Plan .................................................................... 22 1.3 Status of Water Supply ......................................................................................... 25 1.3.1 Actual Water Supply from Different Sources ............................................................................... 25 1.3.2 Proposal for Augmentation of Water Supply System .................................................................. 26 1.4 Status of Existing Waste Water Disposal Works .................................................. 26 1.4.1 Existing Works ............................................................................................................................. 26 1.4.2 Works under Execution ............................................................................................................... 28 1.4.3 Works Sanctioned ....................................................................................................................... 28 1.4.4 Total Waste Water Generation .................................................................................................... 30 1.5 Status of Pollution of River ................................................................................... 31 1.5.1 Number and Details of Drainage Channels ................................................................................. 31 1.5.2 Waste Water Flow Carried by Drains .......................................................................................... 34 1.5.3 Measurement of Flows in Drains along with Copies of Test Report ........................................... 34 1.5.4 Waste Water Characteristics of Different Drains ......................................................................... 36 1.5.5 Details of Measurement of Waste Water Characteristics along with Copies of Test Reports ................................................................................................................................ 36 1.5.6 Water Quality of the River U/S, D/S and at Outfall of Drain discharging into River ............................................................................................................................................ 38 1.5.7 Measurement of the Quality of River Water along with copies of Test Report ........................... 38 1.5.8 Methodology followed for Flow Measurement and Quality Characteristics ................................ 38 1.5.9 Water Quality Standards of River Water Quality ......................................................................... 38 1.5.10 Justification of the Project for Pollution abatement of the River .................................................. 38 2 SEWERAGE WORK ................................................................................. 41 2.1 Status of Water Supply ......................................................................................... 41 2.1.1 Actual Water Supply from Different Sources ............................................................................... 41 2.1.2 Proposal for Augmentation of Water Supply System .................................................................. 41 1 2.2 Status of Existing Waste Water Disposal Works .................................................. 41 2.2.1 Existing Works ............................................................................................................................. 42 2.2.2 Works under Execution ............................................................................................................... 44 2.2.3 Works Sanctioned ....................................................................................................................... 44 2.3 Drainage Areas ..................................................................................................... 45 2.4 Population Projections of Each District in Design Years ...................................... 46 2.5 Projected Waste Water Flows in each District in Design years ............................ 48 2.6 Sewage Collection and Treatment Options .......................................................... 49 2.7 Septage Management Plan .................................................................................. 56 2.8 Details of Centralized Option ................................................................................ 57 2.8.1 Capacity of STP .......................................................................................................................... 58 2.8.2 Land Available for Various Components ..................................................................................... 59 2.8.3 O&M Cost of Proposed Works .................................................................................................... 59 2.9 Decentralized Option ............................................................................................ 63 2.10 Operation and Maintenance ................................................................................. 66 3 OPTION ADOPTED .................................................................................. 67 3.1 Cost Comparison .................................................................................................. 67 3.2 Impact of the Proposed Works on the Health of the River ................................... 67 3.3 Recommendation .................................................................................................. 68 4 INSTITUTIONAL ARRANGEMENTS ....................................................... 69 4.1 Existing Institutional Framework ........................................................................... 69 4.2 Project management Unit ..................................................................................... 70 4.3 Training needs Assessment ................................................................................. 70 5 ENVIRONMENTAL IMPACT ASSESSMENT ........................................... 73 5.1 Environmental Impact Assessment ...................................................................... 73 5.1.1