annexures - Indian Institute of Technology Roorkee

CHAPTER 5DETAILED PROJECT REPORTSOF SEWERAGE SCHEMES5.1 GENERALThe Feasibility Report would have selected the most suitable system for pollution abatement.Design of the selected system and its components should be done following these guidelines.NGRBA guidelines provide for the River Ganga basin, that apart from conveying sewers,pumping stations and STPs, these items should also be included in projects in unsewered areasto make the city fully sewered. Under NRCP also, branch and lateral sewers and houseconnections up to the property land are to be proposed to ensure comprehensive coverage.DPR shall be prepared on the basis of detailed survey, investigation & engineering design.Designs of all these facilities should be based on standard procedures laid down in CPHEEOmanual (http://urbanindia.nic.in/publicinfo/manual.htm). In the event of absence of guidelinein the manual on a particular aspect, BIS codes, standard books, state / CPWD manuals may befollowedSelection of pipe materials like GRP / DI etc shall be as per site conditions. Basis for selection ofgravity sewer/rising main shall be provided in the DPR.Existing sewerage works should be dovetailed with the proposed scheme.Provision of dedicated feeders for SPS and STPs is essential to ensure round the clock operation.The DPR should contain details of such feeders like length of the cable from the power source,specifications of transformers and estimated cost. NRCD would not consider funding proposalswhich do not comply with this requirement.5.2 Improving an Existing SystemIf a decision is taken to improve an existing system of waste water management by repairing,refurbishing, upgrading and / or modernizing, the items of work that are needed should beidentified and the details worked out and costs estimated.5.3 Design Parameters Covered in Chapter on Feasibility ReportDetails of the following items have been given in Chapter on “Preparation of Feasibility Reportof Sewerage Schemes” and, therefore, are not being repeated here:i. Design Periodsii. Future Population & Population Projectionsiii. Sewerage Master Planning / Zoningiv. Rate Of Water Supplyv. Status Of Existing Water Supplyvi. Per Capita Sewage Flowvii.viii.Ground Water InfiltrationRiver Water Qualitya) Water Quality Standards For Rivers42