New York Codes, Rules and Regulations
Title 21 - Miscellaneous
Chapter XVIII - Delaware River Basin Commission
Subchapter C - Flood Plain Regulations
Part 873 - Administration
Section 873.3 - Technical standards
Current through Register Vol. 46, No. 39, September 25, 2024
(a) Standards used by State and local governments shall conform in principle to commission standards, but may vary in detail provided that resulting flood plain use will not be less restrictive than would result from the application of commission standards. The commission will review proposed State and local flood plain regulations to determine their compliance with commission standards.
(b) Because of the variety and diversity of presently recognized hydrologic procedures, no one procedure or method is prescribed for determining the peak flow in cubic feet per second for the 100-year storm (Q 100) on which profiles for the delineation of flood hazard areas are based. The following may be used:
State and local agencies may use methods resulting in Q 100's which are in reasonable agreement with those of the commission. Any significant difference shall be reviewed with and subject to approval by the executive director.
(c) Methods and procedures shall be uniform, so far as practicable, within subbasins which have a major effect on the larger basins of which they are a part. To assist in achieving this objective, the commission staff will periodically provide to the various interested governmental agencies and others Q 100 data as developed by the Delaware River Basin Commission Hydrology Coordinating Committee for key locations in the Delaware River Basin. These will be based on a Log Pearson Type 3 analysis of data from the U.S.G.S. gaging stations using station skew, regional skew, or weighted skew, depending on the scope of data at each station.
