Madam,two three things are to ...

Madam, two three things are to be very important to point out, 1) Yamuna water before supply should be filtered for algae and chlorinated 2) require huge power because 20 km distance supply line require to much pressure in pipe line, which require high pressure bearing pipe and we have to face large head loss. or if design engineers team have experience may think for over head pipe system design which reduce excavation cost and laying /repairing in heavy traffic area can be avoided( not easy design but can be done) 4) Roof water harvesting is costly under ground tank can be constructed by people participation may reduce demand by aprox. 10% , the store water can be used for cooking only, in our study at Junagadh Gujarat 225 Rs. cost goes per cu.m of storage tank which may more in Delhi. 5) Some old very good functioning part of supply lines should be kept as it is and most of old and shallow buried pipe should be replace by new one. In supply line two factors are main diameter of pipe should not be under size which create huge power loss and over size take huge installation amount, so there should be design compromise, and continuous length may not be advisable 20 km, should be split out., 6) I suggest over head pipe line suppy in combination with under ground pipe line may be new approach as well as good control for leakages can easily observe(leakage) and easy for maintenance against few drawbacks