No. 40169 (Amendment): Section R655-10-5A. Hazard Classification -- Criteria

(Amendment)

DAR File No.: 40169
Filed: 01/29/2016 11:21:03 AM

RULE ANALYSIS

Purpose of the rule or reason for the change:

The current rule requires clarification and an update to current industry practice.

Summary of the rule or change:

Section R655-10-5A is clarified and updated to current industry practice.

State statutory or constitutional authorization for this rule:

• Title 73, Chapter 5a

Anticipated cost or savings to:

the state budget:

No cost involved--Clarification of processing does not require a dollar figure.

local governments:

No cost involved--Clarification of processing does not require a dollar figure.

small businesses:

No cost involved--Clarification of processing does not require a dollar figure.

persons other than small businesses, businesses, or local governmental entities:

No cost involved--Clarification of processing does not require a dollar figure.

Compliance costs for affected persons:

No cost involved--Clarification of processing does not require a dollar figure.

Comments by the department head on the fiscal impact the rule may have on businesses:

No fiscal impact--Clarification of processing does not require a dollar figure.

Michael Styler, Executive Director

The full text of this rule may be inspected, during regular business hours, at the Division of Administrative Rules, or at:

Natural Resources
Water RightsRoom 220
1594 W NORTH TEMPLE
SALT LAKE CITY, UT 84116-3154

Direct questions regarding this rule to:

• Marianne Burbidge at the above address, by phone at 801-538-7370, by FAX at 801-538-7467, or by Internet E-mail at [e-mail]

Interested persons may present their views on this rule by submitting written comments to the address above no later than 5:00 p.m. on:

03/16/2016

This rule may become effective on:

03/24/2016

Authorized by:

Michael Styler, Executive Director

RULE TEXT

R655. Natural Resources, Water Rights.

R655-10. Dam Safety Classifications, Approval Procedures and Independent Reviews.

R655-10-5A. Hazard Classification -- Criteria.

The hazard classification analysis should include a determination of the threat to human life and property damage in the event of the failure of a dam. In some cases the classification can be assigned by observance of the downstream development in relationship to the location of the dam. In other cases it will be necessary to prepare inundation maps to determine the downstream consequences of failure. When using maps for hazard classification determination, the inundation boundary, as well as the depth and velocity of flow, will be considered. In preparing the inundation maps, the following criteria relative to the dam should be used.

1. No concurrent flooding conditions exist.

2. The reservoir level is at the [emergency ]spillway crest.

3. The low level outlet is discharging at capacity.

4. The breach times and geometric parameters used to simulate the dam failure should be acceptable to the State Engineer and consistent with accepted practices.

5. The inundation study should be carried downstream to a point that the breach flows are contained within the banks of the natural channel or a downstream reservoir.

 

KEY: dam safety, dams, reservoirs

Date of Enactment or Last Substantive Amendment: [October 24, 2012]2016

Notice of Continuation: April 14, 2011

Authorizing, Implemented, or Interpreted Law: 73-5a

 

---