Pollution Control Board, Assam Conservation of River Kolong, Nagaon Detailed Project Report December 2013 DRAFT Joint Venture of THE Louis Berger Group, INC and DHI (India) Water & Environment Pvt. Ltd. DPR - Kolong CONTENTS contents i FIGURES vii TABLES Error! Bookmark not defined. LIST OF ABBREVIATIONS ............................................................................................................ x EXECUTIVE SUMMARY ................................................................................................................. 1 Conservation Schemes and Summary of Costs ............................................................................... 2 1 About the Project Area .............................................................................................1-1 1.1 Authority for preparation of project .............................................................................1-1 1.2 Description of Project Area .........................................................................................1-1 1.2.1 Brief History of the town .............................................................................................1-1 1.2.2 Geographical Location ...............................................................................................1-1 1.3 Population in the Project Area ....................................................................................1-2 1.4 Status of water supply ................................................................................................1-2 1.5 Status of existing waste water disposal system ..........................................................1-2 1.6 Status of drains ..........................................................................................................1-2 1.7 River Water quality .....................................................................................................1-2 1.8 Justification of the project for pollution abatement of the river ....................................1-2 2 Collection of Data .....................................................................................................2-1 2.1 Introduction ................................................................................................................2-1 2.2 Data Required at Different Levels ...............................................................................2-1 2.2.1 Drainage Basin Map ...................................................................................................2-1 2.2.2 Raster Layers .............................................................................................................2-2 2.2.3 Shape Layers .............................................................................................................2-3 2.3 Town Related Data .....................................................................................................2-4 2.3.1 Maps Related to City ..................................................................................................2-4 2.3.2 Land Use, Contour, Drainage and Other Thematic Maps: ..........................................2-5 2.3.3 Use of State of Art Tools like Remote Sensing and GIS .............................................2-5 2.3.4 Population of the Town: ..............................................................................................2-5 2.3.5 Land Use, Contour, Drainage and Other Thematic Maps: ..........................................2-7 DPR - Kolong page i 2.3.6 Use of State of Art Tools like Remote Sensing and GIS ............................................ 2-7 2.3.7 Population of the Town .............................................................................................. 2-8 3 Conservation Measures .......................................................................................... 3-1 3.1 General Conservation Framework ............................................................................. 3-1 3.2 Road Map for the Conservation of Kolong River ....................................................... 3-1 3.3 Root Cause Analysis & Measures Solution Options ................................................... 3-3 4 Sewerage Schemes ................................................................................................. 4-1 4.1 Approach ................................................................................................................... 4-1 4.1.1 Design Criteria ........................................................................................................... 4-3 4.1.1.1 System configuration ................................................................................................. 4-3 4.1.1.2 Wastewater Generation Rate ..................................................................................... 4-3 4.1.1.3 Groundwater Infiltration ............................................................................................. 4-5 4.1.1.4 Depth of Flow ............................................................................................................ 4-5 4.1.1.5 Peak Factor ............................................................................................................... 4-5 4.1.1.6 Hydraulic Design Formula.......................................................................................... 4-6 4.1.1.7 Flow Velocity and Gradient ........................................................................................ 4-6 4.1.1.8 Maximum Depth to Invert ........................................................................................... 4-7 4.1.1.9 Minimum Cover and Sewer Protection ....................................................................... 4-7 4.1.1.10 Minimum Pipe Diameter ............................................................................................ 4-7 4.1.1.11 Sewer Transition ........................................................................................................ 4-7 4.1.1.12 Material of Sewer Line ............................................................................................... 4-7 4.1.1.13 Structural Design of Sewer ...................................................................................... 4-12 4.1.1.14 Manhole ................................................................................................................... 4-12 4.1.1.15 Sewer Crossing ....................................................................................................... 4-14 4.1.1.16 Sewage Pumping Station......................................................................................... 4-14 4.1.1.17 Sewer Warning Tape ............................................................................................... 4-17 4.1.2 Design Periods ........................................................................................................ 4-17 4.1.3 Population Projections ............................................................................................. 4-18 4.1.4 Norms of Rate of Water Supply ............................................................................... 4-18 4.2 Calculation of Waste Water Discharge..................................................................... 4-19 4.2.1 Actual Water Supply from Different Sources ............................................................ 4-19 4.2.2 Projected Waste Water Flows .................................................................................. 4-19 4.3 Decentralized STPs ................................................................................................. 4-21 4.3.1 Projected Waste Water Flows in each District in Design years ................................ 4-21 4.3.2 Length of Sewer Lines and Capacity of SPS, STPs in each District ......................... 4-22 page ii DPR - Kolong 4.3.3 Availability of Land for various Components in each District ..................................... 4-22 4.3.4 Cost of STP including O&M ...................................................................................... 4-23 4.3.5 Cost of proposed sewer network including O&M costs ............................................. 4-24 5 Solid Waste Management ........................................................................................5-1 5.1 Introduction ................................................................................................................5-1 5.2 Existing Situation ........................................................................................................5-1 5.2.1 Baseline information ...................................................................................................5-1 5.2.2 Deficiencies in SWM System ......................................................................................5-6 5.2.3 Justification for Upgrading the Present System or a New System ..............................5-7 5.3 Proposed MSW Management System ........................................................................5-7 5.4 Details of Proposed MSW Management System ........................................................5-8 5.4.1 Calculation of Infrastructure required ..........................................................................5-9 5.4.1.1 Secondary Waste Storage System .............................................................................5-9 5.4.1.2 Proposed Infrastructure for Secondary Waste Collection System: ............................ 5-10 5.4.1.3 Waste Transportation System .................................................................................