OAR 690-020-0044
Design Requirements for New Dams or to Increase Dam Height: Instrumentation for Monitoring

Designs must include methods for determining if the Dam is operating properly based on the Hazard Rating of the Dam, and include:

(1)

A plan to share monitoring data with the Department;

(2)

Staff gage near controls for the Conduit or where they can be easily seen by the Dam owner or operator. The staff gage shall be clearly marked in feet and tenths of feet, and extend to within one foot of the Crest. Markings and numbers on the gage rod shall be of sufficient size to be easily readable from the Crest;

(3)

Multiple and easily accessible outlets of all Toe Drains. Toe Drains shall be designed to discharge into locations where flows can be evaluated and monitored. Multiple discharge points are required in order to isolate seepage to various sections of the Dam and Foundation. Discharge points must be located where routine Dam maintenance is not likely to damage the drains;

(a)

For High Hazard Dams, drains must have a measuring weir or other device, and a basin for settling drainage Water so that internal erosion can be identified;

(b)

Where drainage galleries are provided for concrete Dams, seepage measuring devices should be provided and accessible for making the necessary readings;

(4)

Unique Identification. All instrumentation and exterior drains shall be labeled with a unique identifying marker designed for durability and to withstand maintenance activities; and

(5)

All High Hazard and, when required by the Engineer of Record or State Engineer, Significant Hazard Dams shall have the following instrumentation:

(a)

Monuments that allow measurement of the horizontal and vertical movements of the Dam. Control or benchmark monuments shall be placed in areas not subject to movement;

(b)

Piezometers to allow monitoring of the phreatic surface within the Dam or for concrete Dams, to determine uplift pressures. Standpipe piezometers must be installed pursuant to monitoring well standards per OAR 690-240-0525 (Piezometers);

(c)

Instrumentation to measure strong ground motions for publically owned Dams in locations where the peak ground acceleration in the 0.2 percent Annual Probability of Exceedance earthquake is greater than 0.3g at the ground surface.

Source: Rule 690-020-0044 — Design Requirements for New Dams or to Increase Dam Height: Instrumentation for Monitoring, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=690-020-0044.

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 690-020-0044’s source at or​.us