Allegany County . (a) (a) Water 3 inches below g-age. Readings
Allegany County . (a) (a) Water 3 inches below g-age. Readings discootinued till December 2S. is moved has been ascertained by means of suitable devices known ascurrent meters. These usually consist of small wheels or turbinescrews so constructed that the flowing water causes them to rate of revolution of the wheel is dependent upon the speed ofthe water. Each revolution is made known or recorded bv suitable MARYLAND GEOLOGICAL SURVEY. ALLEGANY COUNTY, PLATE IKICE ELECTRIC CLKKICNT METEKS, Willi i;L ZZEKS. MARYLAND GEOLOGICAL SURVEY 237 electrical device, and wlieu the relation lietueen the revolution ofthe wheel of the curient meter and the velocity of the stream has oncebeen ascertained it is a relatively simple mechanical matter to com-pute the rate of flow at any point across or beneath the surface of ariver. The following table gives in cubic feet per second, or second- DAILY GAGE HEIGHT OF POTOMAC RIVER AT CUMBERLAXO, MI)..FOR 1896. Jan. Feb. Mar. Apr. Maj- June July Aug. Sept, Oct. Nov. Dec ]!,!: 