Calzaduras

nEW New York State

DEC
Division of Water

Guidelines for Design of Dams
January 1985 Revised January 1989

New York State Department of Environmental Conservation
George E. Pataki, Governor John P. Cahill, Commissioner

GUIDELINES FOR DESIGN OF DAMS

NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION DIVISION OF WATER BUREAU OF FLOOD PROTECTION DAM SAFETY SECTION 50 WOLF ROADALBANY, NEW YORK 12233-3507

GUIDELINES FOR DESIGN OF DAMS TABLE OF CONTENTS SECTION TITLE Preface to the January 1989 Edition 1 2 3 4 5 6 6A 7 8 9 10 11 12 13 14 15 16 17 Introduction Definitions Hazard Classification Design and Construction Documents Hydrologic Criteria Hydraulics of Spillways Flashboard Policy Outlet Works and Conduits Geotechnical Investigations Earth Dams StructuralStability Criteria for Gravity Dams Existing Dams: Rehabilitation and Modification Cofferdams Miscellaneous Emergency Action Plan Approval to Fill Reservoir References DEC - Regional Directory PAGE 1 2 3 5 5 7 10 12 15 16 18 21 25 26 27 27 28 29 31

PREFACE TO THE JANUARY 1988 EDITION The January 1988 revision involves: Page 2 4 6 11 14 19 22 25 28 Item Introduction Corrected definition for theService Spillway Design Flood (SSDF) Construction Inspection Insertion of Section 6A, Flashboard Policy Filter and drainage diaphragm replacing antiseep collars for pipe conduits Vegetation Control Insertion of Loading Condition 3A Cofferdams The addition of references 3, 4, 5 and 6

PREFACE TO THE JANUARY 1989 EDITION The January 1989 revision involves: Page 7 7 Item Hydrology InvestigationsExisting Dams - Service Spillway Design Flood Criteria

1.0 INTRODUCTION 1.1 General The Department of Environmental Conservation receives many requests for detailed information about designs for dams requiring a permit under Article 15, Section 0503 of the Environmental Conservation law. This brochure has been developed by the department for the general guidance of design engineers. These guidelinesrepresent professional judgment of the Dam Safety Section's staff engineers. The guidelines convey sound engineering practices in an average situation. Where unusual conditions exist and the guidelines are not applicable, it is the duty of the design engineer to notify the department which will then consider deviation from the guidelines. Since these are only general guidelines for small damconstruction in an average situation, compliance will not necessarily result in approval of the application. The determination by the department of the acceptability of the design and adequacy of the plans and specifications will be made on a case-by-case basis. The primary responsibility of proper dam design shall continue to be that of the applicant. In the administration of this law, the departmentis concerned with the protection of both the health, safety and welfare of the people and the conservation and protection of the natural resources of the State. (See Reference 1 and 2). Water stored behind a dam represents potential energy which can create a hazard to life and property located downstream of the dam. At all times the risks associated with the storage of water must be minimized.This document deals with the engineering guidelines for the proper design of a dam. In order for a dam to safely fulfill its intended function, the dam must also be constructed, operated and maintained properly. Supervision of construction or reconstruction of the dam by a licensed professional engineer is required to insure that the dam will be built according to the approved plans. See Article15-0503, Item 5 of the New York State, Environmental Conservation Law (Reference 1). For the proper operation and maintenance of a dam, see "An Owners Guidance Manual for the Inspection and Maintenance of Dams in New York State" (Reference 6). 1.2 Application A permit is required if the dam: is at least 10 feet high or stores 1 million gallons (3.07 acre feet) or has a drainage area of 1 square...