The Maneri-Bhali Hydel Scheme (Stage I) envisages the construction of a 41 m. high dam at Maneri (30°44 50″; 78°23′; 53J/10); a 8·3 Km long power tunnel and a power house at Tiloth (30°43’50”; 78°26’50 53J/6), in order to utilise the hydraulic drop between Maneri and Tiloth for power generation. The diversion dam will be founded on heavily jointed quartzites belonging to the Barahat Series, and the power house will be located on a sub-recent river terrace deposit. The Himalayan belt is one of the most active seismic belts and has been the locale of some of the major earthquakes that have occurred in this country. With the development of major river valley projects in the Himalayan Region, special seismic studies have assumed increasing importance so that proper guidance can be had in selecting a suitable seismic coefficient for the design of major structure. This note deals with the geo-seismological considerations relating to the design of Maneri Bhali Hydel Scheme (Stage-I) which is now under construction in the Bhagirathi Valley. The Geo-seismological considerations relate to the available information concerning the past earthquake epicentres, their magnitude, frequency and distribution, and an evaluation of the activity of the various thrusts, faults and other geological features occurring within a 300 Kms. redial distance of the project.