1. (b) Waters index number as appearing in table I shall mean that number assigned to any designated waters for the purpose of identification.

   1. (1) The numbering or index system used to identify specific waters of New York State was adapted from that used by the New York State Conservation Department in its biological survey series of reports on the watersheds of the State. The primary waters of a drainage basin, a stream or large lake, is referred to by name or abbreviation. Ponds and lakes are numbered consecutively as they are encountered, such number being preceded by the letter P. This system also involves the consecutive numbering of tributaries as they enter a stream, progressing upstream from the mouth. Tributaries of lakes or ponds are numbered consecutively as they enter, progressing clockwise around the lake or pond from its outlet or mouth. Isolated lakes and ponds are referenced by a waters index number merely for convenience of their identification and location within a subdrainage basin, and it is not necessarily indicative of their being tributary to any waters to which no surface connection is shown on the reference maps.
   2. (2) This system was applied to the basin under consideration by the Conservation Department in its biological survey of the Delaware and Susquehanna watersheds in 1935 and has been closely followed in connection with the identification of the waters with the following exceptions: Some of the stream numbers do not run consecutively due to the omission of streams originally shown on the older maps employed by the Conservation Department at the time of its 1935 survey but not shown on newer maps reproduced herein. Conversely, a few streams not shown on the older maps but appearing on the newer maps are designated by the letters a, b, c, etc.

   3. (3) The system as applied to the identification of waters in the Delaware River Drainage Basin may be illustrated as follows:

      Waters index number	Name of waters	Explanation
      D	Delaware River	Primary waters within New York State extending upstream from Tri-State Rock to the confluence of the East Branch and West Branch Delaware River.
      D-1	Neversink River	The first tributary entering the Delaware River upstream from Tri-State Rock.
      D-71	West Branch	The 71st (and last) tributary entering the Delaware River Delaware River upstream from Tri-State Rock.
      D-71-61	Little Delaware River	The 61st tributary entering West Branch Delaware River upstream from its mouth.
      D-71-61-7-P 420	Lake Delaware	The 420th pond encountered in the waters index system located on the watershed of the watershed of the 7th tributary upstream from the mouth of Little Delaware River.

2. (c) The abbreviations trib. and tribs. indicating tributary and tributaries, and the terms subtributary and subtributaries shall mean any stream, pond or other body of surface water which flows into any other stream, pond, or other body of surface water; where no tributary, tributaries, subtributary or subtributaries are mentioned, the specifically designated waters shall include only the stream, pond, or other body of water referenced by such waters index number; where a tributary, tributaries, subtributary or subtributaries are mentioned after the waters index number, the specifically designated waters shall include the stream, pond, or other body of water referenced by such waters index number and all tributaries and subtributaries thereof, which are shown on the reference maps, excluding numbered ponds, unless exceptions are expressly stated.

3. (d) Name as appearing in table I shall mean the name by which the specifically designated waters are known and which name may appear on the reference maps. In cases of specifically designated waters which have no name, the named waters to which the unnamed waters are tributary are identified as far as possible.

   (e) Description.

   The column headed “Description” contains designations of segments or section of waters under consideration to which a particular assignment of a class and standards shall apply. Also included in this column is any useful information pertinent to the classification or standards.

4. (f) Map Ref. No., as appearing in table I, means map reference number and indicates one or more of the following numbered maps reproduced herein completely, or in part, on which maps the specifically designated waters and their index numbers are shown within the topographical limit line of the described drainage basin. The following maps were reproduced from original maps which may be procured through the Washington Distribution Section, Geological Survey, Silver Spring, Maryland:

   Map. Ref. No.	Quadrangle name	Edition	Published by
   L-18-se	Unadilla, N.Y.	1945	Corps of Engineers, U.S. Army
   L-19sw	Franklin, N.Y.	1945	Corps of Engineers, U.S. Army
   L-19se	Treadwell, N.Y.	1945	Corps of Engineers, U.S. Army
   L-20nw	West Davenport, N.Y.	1945	Corps of Engineers, U.S. Army
   L-20ne	Davenport, N.Y.	1945	Corps of Engineers, U.S. Army
   L-20sw	Delhi, N.Y.	1943	Corps of Engineers, U.S. Army
   L-20se	Bloomville, N.Y.	1943	Corps of Engineers, U.S. Army
   L-21nw	Harpersfield, N.Y.	1946	Corps of Engineers, U.S. Army
   L-21ne	Stamford, N.Y.	1946	Corps of Engineers, U.S. Army
   L-21sw	Hobart, N.Y.	1946	Corps of Engineers, U.S. Army
   L-21se	Roxbury, N.Y.	1946	Corps of Engineers, U.S. Army
   L-22sw	Prattsville, N.Y.	1946	U.S. Geological Survey
   M-17	Nineveh, N.Y.	1905	U.S. Geological Survey
   M-17se	Gulf Summit, N.Y.	1952	U.S. Geological Survey
   M-18	Deposit, N.Y.	1924	U.S. Geological Survey
   M-19	Walton, N.Y.	1925	U.S. Geological Survey
   M-20	Andes, N.Y.	1922	U.S. Geological Survey
   M-21nw	Margaretville, N.Y.	1946	U.S. Geological Survey
   M-21ne	Fleischmanns, N.Y.	1943	U.S. Geological Survey
   M-21sw	Arena, N.Y.	1946	U.S. Geological Survey
   M-21se	Seager, N.Y.	1946	U.S. Geological Survey
   M-22nw	West Kill, N.Y.	1946	U.S. Geological Survey
   M-22sw	Shandaken, N.Y.	1946	U.S. Geological Survey
   M-22se	Phoenicia, N.Y.	1946	U.S. Geological Survey
   N-18	Starrucca, Pa.-N.Y.	1933	U.S. Geological Survey
   N-19	Long Eddy, N.Y.-Pa.	1944	Corps of Engineers, U.S. Army
   N-20	Livingston Manor, N.Y.	1944	Corps of Engineers, U.S. Army
   N-21	Neversink, N.Y.	1944	Corps of Engineers, U.S. Army
   N-22nw	Peekamoose Mountain, N.Y.	1943	Corps of Engineers, U.S. Army
   N-22ne	West Shokan, N.Y.	1943	Corps of Engineers, U.S. Army
   O-19	Damascus, N.Y.-Pa.	1920	U.S. Geological Survey
   O-20	White Lake, N.Y.-Pa.	1957	U.S. Geological Survey
   O-21	Monticello, N.Y.	1944	Corps of Engineers, U.S. Army
   O-22nw	Ellenville, N.Y.	1943	Corps of Engineers, U.S. Army
   O-22sw	Wurtsboro, N.Y.	1943	Corps of Engineers, U.S. Army
   P-20	Milford, Pa.-N.Y.-N.J.	1944	Corps of Engineers, U.S. Army
   P-21nw	Port Jervis North, N.Y.-Pa.	1943	Corps of Engineers, U.S. Army
   P-21ne	Otisville, N.Y.	1943	Corps of Engineers, U.S. Army
   P-21sw	Port Jervis South, N.Y.-N.J.-Pa.	1953	U.S. Geological Survey
   P-21se	Unionville, N.Y.-N.J.	1953	U.S. Geological Survey

5. (g) Class, as appearing in table I and denoted by the letters AA, A, B, C or D opposite each specifically designated waters, shall mean class AA, A, B, C or D, as the case may be, as set forth in Part 701 of this Title.
6. (h) Standards, as appearing in table I and denoted by the letters AA, A, B, C or D opposite each specifically designated waters, shall mean the quality standards established for clasa AA, A, B, C or D, as the case may be, as set forth in Part 701 of this Title. The symbol (T) appearing after any class designation shall mean that the designated waters are trout waters and that the dissolved oxygen specification for trout waters shall apply thereto. The symbol (TS) after any class designation shall mean that the designated waters are suitable for trout spawning and that the dissolved oxyen specification for trout spawning waters shall apply thereto.
7. (i) The term trout as used in this Part means any fish in the following genera: Coregonus, Oncorhyncus, Prosopium, Salmo, Salvelinus and Thymallus.

The several terms, words or phrases hereinafter mentioned shall be construed as follows:

(a) Item No.

In table I an item number is assigned consecutively to each specifically designated waters.