and of gravel and permanent but rather rough. There are two channels at all stages. The current is good at all stages, ranging from about one to five feet per second. Discharge measurements are made from the upstream side of the bridge in the left span, and from the down stream side in the right span, the initial point for soundings being vertically over the left abutment, on the upstream side. A standard chain gage read twice each day by Gilbert Dean is attached to the floor of the bridge on the upstream side near the center of the right span; length of chain 22.11 feet. The gage is referred to bench marks as follows: (1) Chisel draft on 3 x 3 foot stone at foot of right abutment, upstream side, marked B. M. O, elevation 4.30 feet; square bolt on top of right abutment upstream side marked B. M. □, elevation 26.52 feet. All elevations refer to the datum of the gage. (2) one inch HUDSON RIVER AT NORTH CREEK, NEW YORK. Daily Discharge in sec. ft. of Hudson River at North Creek, N. Y. (Drainage area, 804 square miles.) DAY. Aug., 1907. Sept., 1907. Oct., 1907. Nov., 1907. Dec., 1907. Jan., 1908. Discharge Measurements of Hudson River at North Creek, N. Y., in 1907. Rating Table for Hudson River at North Creek, N. Y. From Aug. 29, 1907, to Dec. 31, 1907. The above table is applicable only for open channel conditions. It is based upon eight discharge measurements made during 1907. It is fairly well defined between gage heights 2.50 feet and 4.50 feet. The table has been extended beyond these limits. Above gage height 5.4 feet the rating curve is a tangent, the difference being 280 per tenth. HUDSON RIVER AT THURMAN, NEW YORK. This station was established September 22, 1907, by W. G. Hoyt. Gage readings were obtained September 1-22 by a temporary staff gage set by H. K. Barrows on September 1. This station is located on the Delaware & Hudson R. R. bridge leading from Thurman to Warrensburg, about 950 feet below the highway bridge to Warrensburg, and some 2,000 feet below the entrance of Schroon River into the Hudson. The drainage area at this point is 1,550 square miles. The channel is straight for about 1,000 feet above the station and some 400 feet down stream where the river divides into two channels forming an island of considerable size. The right bank is about eight feet high at ordinary stages, and is clear with the exception of a few trees along the river's edge. This bank overflows during high water, when flow occurs under another section of the bridge. The left bank is high and rocky, clear up to the high water line and does not overflow. The bed is of gravel and per manent. There are two channels under ordinary conditions, and three during high water as previously noted. The current is good at all stages. Discharge measurements are made from the upstream side of the bridge on the line of the guard-rail, the initial point for soundings being vertically above the left abutment at the upstream side. A standard chain gage which is read three times daily by S. H. Spencer is attached to the end of the ties outside the guard-rail about 100 feet from the left abutment; length of chain 29.08 feet. The gage is referred to bench marks as follows: (1) Nail in top of stump on left bank about sixty feet upstream from bridge, and forty feet from the water's edge. Elevation 12.94 feet; (2) top of 22 inch iron pin on left abutment, upstream side, used for holding lateral brace, elevation 26.71 feet; (3) marked "R. P." on top of first floor beam from right abutment, one foot upstream from end of cross ties, elevation 26.83 feet. All elevations refer to the datum of the gage. HUDSON RIVER AT THURMAN, NEW YORK. Daily Discharge in Sec. Ft. of Hudson River at Thurman, New York. *(Drainage area, 1,550 square miles.) Discharge Measurements of Hudson River at Thurman, New York, in 1907. Rating Table for Hudson River at Thurman, New York. 1907, to December 31, 1907. From August 28, The above table is applicable only for open channel conditions. It is based upon eleven discharge measurements made during 1907. It is fairly well defined between gage heights 2.5 feet and 5.0 feet. The table has been extended beyond these limits. Above gage height 5.0 feet the rating curve is a tangent, the difference being 300 per tenth. |