Information for comparing costs of collecting hydrometric data in different countries may promote efficiency of operations. The hydrometric programme in the United States consists of 8400 full-record stations and an equal number of partial-record stations operated by 47 district offices. A sampling of four districts selected to represent the range of hydrometric conditions in the country indicated that costs (in 1972) for installation of a full-record station intended for indefinite terms of operation ranged between $5000 and $10,000. Short-term stations range between $2500 and $4000. Costs of operation for full-record stations ranged between $800 and $1250 per year, whereas office costs for processing the record ranged between $500 and $1250. A very considerable emphasis is given in the programme to partial-record stations designed to furnish specific information for floods and droughts. Annual costs in terms of full-record stations range from only 5 per cent for a low-flow station, 15–20 per cent for a crest-stage record, to 50 per cent for a flood-hydrogram station. Publication costs average about $7 per page. This small sample survey shows considerable variations and even greater variations might be expected internationally. In any case, differences in costs nationally or internationally invite proper inquiry as to causes in the search for economy.
