1. (b) Waters index numbers 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 report, A Biological Survey of the Lower Hudson Watershed—1936, 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 survey but not shown on newer maps reproduced herein. Conversely, a few streams not shown on the older maps but appearing on the new maps are designated by the letters a, b, c, etc.

   3. (3) The system as applied to the identification of waters in the Housatonic River drainage basin may be illustrated as follows:

      Waters index number	Name of waters	Explanation
      Mass.		Streams with headwaters in New York State which traverse the New York-Massachusetts boundary numbered consecutively from south to north.
      Mass. 5	Green River	The 5th stream flowing into Massachusetts across the New York-Massachusetts boundary
      Mass. 5-4	Crause Creek	The 4th tributary of Green River within New York State.
      Mass. 5-P1137	No Bottom Pond	The 1137th pond encountered in the lower Hudson watershed.
      Conn.		Streams with headwaters in New York State which traverse the New York-Connecticut boundary, numbered consecutively from south to north.
      Conn. 15	Tenmile River	The 15th stream flowing into Connecticut across the New York-Connecticut boundary.
      Conn. 15-12	Webatuck Creek	The 12th tributary of Tenmile River within New York State.
      Conn. 15-12-21	Tributary of Webatuck Creek	The 21st tributary of Webatuck Creek.
      Conn. 15-12-21- P1134	Rudd Pond	The 1134th pond encountered in the lower Hudson watershed.
      Conn. 15-12-21- P1134-1	Tributary of Rudd Pond	The 1st tributary of Rudd Pond.

2. (c) The abbreviation 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) Comments.

   The column headed “Comments” contains designations or segments or sections 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 in section 825.9, infra, 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 produced from the 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-25se	Chatham	1953	U.S. Geological Survey
   L-26nw	Canaan	1946	U.S. Geological Survey
   L-26sw	State Line	1959	U.S. Geological Survey
   M-25se	Copake	1953	U.S. Geological Survey
   M-26nw	Egremont	1958	U.S. Geological Survey
   M-26sw	Bashbish Falls	1958	U.S. Geological Survey
   N-25ne	Millerton	1955	U.S. Geological Survey
   N-25se	Amenia	1958	U.S. Geological Survey
   N-25sw	Millbrook	1944	U.S. Geological Survey
   N-25nw	Pine Plains	1945	U.S. Geological Survey
   N-26nw	Sharon	1956	U.S. Geological Survey
   O-25ne	Dover Plains	1958	U.S. Geological Survey
   O-25se	Pawling	1958	U.S. Geological Survey
   O-25sw	Poughquag	1945	U.S. Geological Survey
   O-25nw	Verbank	1944	U.S. Geological Survey

5. (g) Class as appearing in table I and denoted by the letter A, B, C or D opposite each specifically designated waters, shall mean class A, B, C or D, as the case may be, as set forth in Part 701, supra.
6. (h) Standards as appearing in table I and denoted by the letter A, B, C or D opposite each specifically designated waters, shall mean the quality standards for class A, B, C or D, as the case may be, as set forth in Part 701, supra. 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 oxygen 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 or family: 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.