entire drainage area of the Hudson river above Mechanicville is somewhat less than 0.3 cubic feet per second per square mile, and for the drainage area above Corinth, apparently the natural flow dropped to 0.15 cubic feet per second per square mile in the drought of August, 1907. The figures in this table emphasize the great need of storage resorvoirs for making the water power of the Hudson more valuable. DAILY GAGINGS OF HUDSON TRIBUTARIES MADE FOR NEW YORK STATE WATER SUPPLY COMMISSION BY THE U. S. GEOLOGICAL SURVEY, UNDER CHAPTER 569, LAWS OF 1907. The following measurements of daily flow at the several stations were made according to the ordinary methods of the U. S. Geological Survey. SCHROON RIVER NEAR RIVERBANK P. O., NEW YORK. This station was established September 23, 1907, by W. G. Hoyt. Gage readings were obtained from September 2 to 22 inclusive by a temporary staff gage set by H. K. Barrows on September second. This station is on the steel highway bridge near Riverbank P. O., between the towns of Warrensburg and Bolton, about nine miles north of the village of Warrensburg and about ten miles downstream from the outlet of Schroon lake. The drainage area at this point is 534 square miles. There are several dams at the village of Warrensburg used for power purposes. During September, 1907, a timber crib dam was constructed at Starbuckville about six miles above the gaging station, for storage purposes, this affording a head of some eight feet and ponding water to Schroon lake. Tumble Head falls begin about one mile above the gaging station and extend upstream for about a mile further, affording a total fall of some thirty feet. The channel is straight for about 2,000 feet above the station; downstream it is straight for about fifty feet, followed by a gentle curve to the left, most pronounced at low water. The banks are high and rocky, clear up to the high water line, and do not overflow. The bed is rocky and permanent. There is but one channel except at very low water when the remains of an old pier divide the channel into two portions. The current is good at all stages, varying from 0.9 feet per second at extreme low water, to 8.0 feet per second at high stages. Discharge measurements are made from the downstream side of the bridge, the initial point for soundings being the face of the right abutment on the line of the hand railing. A standard chain gage which is read twice each day by J. R. Roberts is attached to the hand rail of the bridge on the upstream side near the left bank; length of chain 22.49 feet. The gage is referred to bench marks as follows: (1) chisel draft on the top corner stone of the left abutment, upstream side, elevation above gage datum 18.17 feet; elevation above mean sea level 717.69 feet; (2) top of bolt at the extreme end of steel rail on left abutment, upstream. side, elevation 18.15 feet above gage datum. DAY. SCHROON RIVER AT RIVERBANK, NEW YORK. Daily Discharge in Cubic Feet Per Second. (Drainage Area 534 Square Miles.) Sept., 1907. Oct., 1907. Nov., 1907. Dec., 1907. Jan., 1908. Extreme low water flow corresponds to the 95 second feet equivalent to 0.18 cubic feet per second per square mile, measured on September second (just before the drought was broken by rainfall). September 15-22, inclusive, is not natural flow as water was being held in Schroon lake by a dam completed at that time. Discharge Measurements of Schroon River at Riverbank, New York, in 1907. Rating Table for Schroon River near Riverbank, New York. From September 2, 1907, to December 31, 1907. The above table is applicable only for open channel conditions. It is based upon eleven discharge measurements made during 1907. It is well defined between gage heights 1.0 feet and 5.5 feet. The table has been extended beyond these limits. Above gage height 5.0 feet the rating curve is a tangent, the difference being 120 per tenth. SACANDAGA RIVER AT WELLS, NEW YORK. This station was established August 26, 1907, by H. K. Barrows, and is on the steel highway bridge over the east branch of the Sacandaga river in the southern part of the village of Wells, about 21⁄2 miles above the junction of the east and west branches. The drainage area at this point is 263 square miles. The channel is straight for about 25 feet above the station, then curving rather sharply to the left. It is straight for 100 feet or more down stream and then curves gently to the right. The right bank is about 12 feet high at ordinary stages and seldom or never overflows. The left bank is high and steep and never overflows. Both banks are skirted more or less continuously with bushes and small trees. The bed is rocky and quite rough, but permanent. There is one channel at all stages. The current is good at medium and high stages, but becomes sluggish and poorly distributed under low water conditions. Discharge measurements are made from the upstream side of the bridge, the initial point for soundings being vertically over the top of the right abutment, upstream side. At low water, measurements are made by wading at a point about 800 feet upstream from the bridge, where a good gravel section is found. An inclined staff gage which is read twice daily by Frank G. Stanyon, Jr., is fastened to bench marks as follows: (1) chisel draft on top of lowest stone of right abutment one foot from upstream side, elevation 5.38 feet; (2) chisel draft on bridge seat, right abutment, upstream side, elevation 21.06 feet. All elevations refer to gage datum. |