 The approach channel from the reservoir to the Puttamgandi pump house (PH) is located at where the Bhimanapalli Vagu tributary is joining the Krishna river.The minimum draw down level (MDDL) of the PH is MSL below which water can not be pumped from NS reservoir.The reliability / dependability of the PH for supplying assured water supply to Hyderabad city, is not adequate due to meagre inflows into the NS reservoir in some years and the need to deplete the NS reservoir water below 502 ft MSL for other purposes.