annexures - Indian Institute of Technology Roorkee

Guidelines for preparation of reports Under NRCP / NGRBA4.8 STATUS OF EXISTING WATER SUPPLYIt shall be ensured that the existing water supply or under execution, has the potential to meetthe water demand of the projected design population at the rate specified in the above table.DPR shall not be approved unless assurance to this effect is received.4.9 PER CAPITA SEWAGE FLOWThe observed dry weather flow reaching the sewer system is less than that of the per capitawater consumption due to loss of some water in leakage and evaporation. Generally, 80% ofwater supply is expected to reach the sewer system. For calculating the water consumed, theground water extracted should also be added to the piped water supply.4.10 GROUND WATER INFILTRATIONAs per guidelines laid down by GoI, suggested estimates for ground water infiltration for sewerslaid below ground water table are:4.11 RIVER WATER QUALITY4.11.1 Water Quality Standards for Rivers4.11.2 Actual Water Quality of the RiverTable 4.4 Ground Water InfiltrationInfiltration Minimum MaximumLiters/km/d 500 5000With improved standards of workmanship and quality and availability of various constructionaids, these values should tend towards the minimum, rather than the maximum. These valuesshould not mean any relaxation on the water tightness test requirements.Water Quality Standards for rivers as per CPCB classification of Designated Best Use criteria ofrivers for bathing are as given below:Table 4.5 Water Quality Standards for RiversParametersStandardspH 6.5 to 8.5BOD3 (mg/l) or lessDO5 mg/l or moreFecal coliformDesireable500 (MPN/100 ml)Maxm. permissible2500 (MPN/100 ml)Chemical quality of water of river u/s and d/s of the city, as monitored during investigations,shall be commented upon and tabulated as given below :Name of Monitoring Agency:Date of monitoring:Place of monitoring37