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Conservation of Kolong River, Nagaon

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Conservation of Kolong River, Nagaon 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 .................................................................................
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