OAR 690-020-0060
Design Requirements for New Dams or to Increase Dam Height: Construction Specifications

All drawings for Dams must be accompanied by construction and material specifications that include the following:

(1)

Construction conditions. Specifications must include the construction period based on typical weather and stream conditions for that location and if applicable, may include a process for the Engineer of Record to modify the construction period;

(2)

Clearing of the Dam site and reservoir. Specifications must include the area to be submerged by the new or enlarged reservoir and specify that the submerged area shall be cleared of logs and debris prior to filling the reservoir. The specifications must require that the footprint of the Dam shall be cleared of all soils containing organic materials, and that this material may not be used for Dam construction;

(3)

Cutoff Trench requirements. Specifications must include the minimum trench depth, width at base of the trench, and maximum side slope steepness. These specifications shall be based on the subsurface investigations and direct that the Cutoff Trench may not be filled if it contains standing Water. Specifications must also include a requirement not to begin filling the Cutoff Trench until approved by Engineer of Record, and where specified, approved by the Department;

(4)

Material specification standards. The specifications shall include material and testing specifications for Dam materials, Conduits, control structures, and other appurtenant structures, using an ASTM standard methodology if available;

(5)

Soil Compaction. The typical compaction specification is 95 percent of standard proctor density, though the Engineer of Record may use a different compaction standard. Specifications shall include the types of acceptable compaction equipment, by material source if necessary. Specifications shall also include maximum lift thickness. Specifications shall prohibit soil compaction dry of optimum moisture content to reduce potential for leakage around the Conduit. For materials placed immediately above or adjacent to the Conduit, specifications must also include verification testing of soils, with representative samples selected for testing as directed by the Engineer of Record. Specifications must also require verification of testing of soil compaction, with representative samples selected for testing by the Engineer of Record, or Engineer’s representative;

(6)

Concrete placement. Specifications shall include means to prevent separation of aggregate and cement, air entrainment requirements if needed, methods for placement and vibration of concrete, required minimum 28 day strength, slump, moisture and temperature requirements for curing. Alkali reactive aggregate shall not be used in the concrete;

(7)

Conduit specifications. Specifications must include the material, diameter, and thickness of the Conduit, and the length of Conduit required for the project. Methods for sealing joints must be specific. Specifications must require that all materials from a manufacturer are certified to meet this test, or that the Engineer of Record has tested the materials directly;

(8)

Accepting and Rejecting Materials. Specifications must include tolerances for acceptable departure from material specifications and a process for rejection of defective materials or workmanship;

(9)

Notification by the Engineer of Record to the State Engineer of changed conditions critical to the safety or operations of the Dam. Specifications shall include State Engineer notification if previously unidentified springs, slope movement or sand lenses are identified, or if storm or other damage occurs during construction;

(10)

The Engineer of Record or their qualified employees must supervise construction as needed to assure compliance with the approved construction plans and specifications; and

(11)

The specifications must also contain a provision to the effect that plans or specifications shall not be altered or changed without the written approval of the State Engineer.

Source: Rule 690-020-0060 — Design Requirements for New Dams or to Increase Dam Height: Construction Specifications, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=690-020-0060.

690‑020‑0000
Purpose and Applicability 690‑020‑0022
Definitions 690‑020‑0024
General Department Authorities and Intergovernmental Coordination 690‑020‑0026
Fees 690‑020‑0028
Preliminary Plans and Specifications for Construction of New Dams or to Increase Dam Height 690‑020‑0035
Minimum Engineering Requirements for Final Design of New Dams or to Increase Dam Height 690‑020‑0036
Design Requirements for New Dams or to Increase Dam Height: Site Suitability and Geotechnical Evaluation 690‑020‑0037
Design Requirements for New Dams or to Increase Dam Height: Hydrology and Inflow Design Flood 690‑020‑0038
Design Requirements for New Dams or to Increase Dam Height: Embankment Dam Structures 690‑020‑0041
Design Requirements for New Dams or to Increase Dam Height: Concrete Dam Structures 690‑020‑0042
Minimum Design Requirements for New Dams or to Increase Dam Height: Spillways 690‑020‑0043
Design Requirements for New Dams or to Increase Dam Height: Penetrating Conduit(s) and Control of Flow through Conduits 690‑020‑0044
Design Requirements for New Dams or to Increase Dam Height: Instrumentation for Monitoring 690‑020‑0047
Design Requirements for New Dams or to Increase Dam Height: Geosynthetics 690‑020‑0048
Exceptions to Standard Design Requirements 690‑020‑0055
Design Requirements for New Dams or to Increase Dam Height: Design Drawings 690‑020‑0060
Design Requirements for New Dams or to Increase Dam Height: Construction Specifications 690‑020‑0065
Plan Requirements for New Dams or to Increase Dam Height: Construction Administration 690‑020‑0068
Plan Requirements for New Dams or to Increase Dam Height: Operations and Maintenance Plan 690‑020‑0070
New Dams or to Increase Dam Height: Submittals and Notifications by the Engineer of Record 690‑020‑0080
New Dams, or to Increase Dam Height, Written Approval by State Engineer 690‑020‑0100
Hazard Rating of Dams 690‑020‑0120
Dam Breach Inundation Analysis 690‑020‑0140
Modification of Dams 690‑020‑0160
Removal 690‑020‑0180
Requirement of Owners to Provide Contact and Transfer of Title Information 690‑020‑0250
Maintenance of Dams 690‑020‑0260
Inspection of Dams 690‑020‑0310
Requirement to Address Maintenance Actions Need for High or Significant Hazard Dams 690‑020‑0340
Potentially Unsafe or Unsafe Conditions 690‑020‑0400
Emergency Action Plans (EAP) 690‑020‑0420
Immediate Action to Prevent Dam Failure 690‑020‑0460
Proposed Final Order, Request for Hearing, Contested Case Process 690‑020‑0600
Civil Penalty Assessment for Dam Safety
Last Updated

Jun. 8, 2021

Rule 690-020-0060’s source at or​.us