File No. 32978
This rule was published in the February 1, 2010, issue (Vol. 2010, No. 3) of the Utah State Bulletin.
Environmental Quality, Drinking Water
Hydraulic Modeling Requirements
Change in Proposed Rule
DAR File No.: 32978
Filed: 01/14/2010 12:13:31 PM
Purpose of the rule or reason for the change:
The rule has been modified in response to comments from public hearing comments and written comments received.
Summary of the rule or change:
Minor changes have been made to the rule in response to comments. (DAR NOTE: This change in proposed rule has been filed to make additional changes to a proposed new rule that was published in the October 1, 2009, issue of the Utah State Bulletin, on page 88. Underlining in the rule below indicates text that has been added since the publication of the proposed rule mentioned above; strike-out indicates text that has been deleted. You must view the change in proposed rule and the proposed new rule together to understand all of the changes that will be enforceable should the agency make this rule effective.)
State statutory or constitutional authorization for this rule:
- Section 19-4-104
Anticipated cost or savings to:
the state budget:
There is no change from the original rule filing. ($20,000 cost based on state engineer's additional review time.)
There is no change from the original rule filing.
There is no change from the original rule filing.
persons other than small businesses, businesses, or local governmental entities:
There is no change from the original rule filing.
Compliance costs for affected persons:
There is no change from the original rule filing. (Estimated cost from Very Small System (fewer than 500 people) $16,060 to Very Large System (greater than 100,000 people) $225,000.)
Comments by the department head on the fiscal impact the rule may have on businesses:
In the original filing of this proposed rule, the Department acknowledged the cost impact on water systems with this new rule. There is no change in the cost impact with this change in proposed rule.
Amanda Smith, Executive Director
The full text of this rule may be inspected, during regular business hours, at the Division of Administrative Rules, or at:Environmental Quality
150 N 1950 W
SALT LAKE CITY, UT 84116-3085
Direct questions regarding this rule to:
- Ying-Ying Macauley at the above address, by phone at 801-536-4188, by FAX at 801-536-4211, or by Internet E-mail at email@example.com
- Bob Hart at the above address, by phone at 801-536-0054, by FAX at 801-536-4211, or by Internet E-mail at firstname.lastname@example.org
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:
This rule may become effective on:
Ken Bousfield, Director
R309. Environmental Quality, Drinking Water.
R309-511. Hydraulic Modeling Requirements.
. . . . . . .
(1) Rule Applicability.
(a) This rule applies to public drinking water systems categorized as community water systems as defined by rule R309-100-4(2) and to non-transient non-community water systems that have system demands higher than required by R309-510 or with demands for fire suppression. All public drinking water systems are still required to comply with R309-550-5 with respect to water main design which may require a hydraulic analysis. Further, Certifications as defined by this rule, shall be part of the submission of plans for any public drinking water project as defined in rule R309-500-5(1), except projects that meet one of the following criteria:
p]ublic drinking water projects that will not result in
negative hydraulic impact, such as, but not limited to,
(A) addition of new sources in accordance with R309-515.
(B) adding disinfection, fluoridation, or other treatment facilities that do not adversely impact flow, pressure or water quality.
(C) storage tank repair .
(D) water main additions with no expansion of service (i.e. looping lines).
(E) adding transmission lines to storage or sources without adding service connections.
(F) adding pump station(s) from source or storage upstream of distribution service connections.
p]ublic drinking water projects that are a part of a
planned phase of a master plan previously approved by the Executive
Secretary per R309-500-6(3)a).
(iii) The water system maintains and updates a hydraulic model of the system, and has designated a professional engineer responsible for overseeing the hydraulic analysis in meeting the requirements of R309-511 in writing to the Executive Secretary.
(iv) The water system has a means that is
deemed acceptable by the Executive Secretary to gather real time
data indicative of hydraulic conditions in [
simulating] scenarios of R309-511-5(9), and the real time data
shows the system is capable of meeting the flow and pressure
requirements for the additional demands placed on the existing
(b) A public water system must clearly identify the reason in the plan submittal if it wishes to demonstrate that R309-511 does not apply to a new construction project. In some cases, supporting documentation may be needed.
(c) If there are existing deficiencies in the water system, the Executive Secretary may allow a new construction project to proceed in accordance with the plan review requirements in R309-500 through 550 as long as the public water system demonstrates that the new construction project is located in a hydraulically separated area and does not adversely impact the existing deficiencies or create new deficiencies within the water system.
(d) This rule does not waive the requirement of R309-550-5(3)
if a proposed project does not qualify under R309-500-6(3) for plan
](2) Rule Elements.
The public water system or its agent, in connection with the submission of plans and specifications to the Executive Secretary, shall perform the following:
(a) Conduct a hydraulic modeling evaluation consistent with the requirements as set forth in this rule and R309-510. This model shall include either the entire public drinking water system or the specific areas affected by the new construction if hydraulically separated areas exist within the water system.
(b) Calibrate the model using field measurements and observations.
(c) Certify in writing to the Executive Secretary that the design complies with the sizing requirements of R309-510 and the minimum water pressures of R309-105-9.
(d) Prepare and submit a Hydraulic Model Design Elements Report (see R309-511-7).
(f) Prepare a System Capacity and Expansion Report if required (see R309-511-8).
R309-511-5. Requirements for the Hydraulic Model.
The following minimum requirements must be incorporated into hydraulic models constructed to meet these requirements:
(1) Include at least 80 percent of the total pipe lengths in the distribution system affected by the proposed project.
(2) Account for 100 percent of the flow in the distribution system affected by the proposed project. Water demand allocation must account for at least 80 percent of the flow delivered by the distribution system affected by the proposed project if customer usage in the system is metered.
(3) Include all 8-inch diameter and larger pipes. Pipes smaller than 8-inch diameter should also be included if they connect pressure zones, storage facilities, major demand areas, pumps, and control valves, or if they are known or expected to be significant conveyers of water such as fire suppression demand. Model piping does not need to include service lateral piping.
(4) Include all pipes serving areas at higher elevations, dead ends, remote areas of a distribution system, and areas with known under-sized pipelines.
(5) Include all storage facilities and accompanying controls or settings applied to govern the open/closed status of the facility that reflect standard operations.
I]nclude all pump stations, drivers (constant or variable
speed), and accompanying controls or settings applied to govern
their on/off/speed status that reflect various operating conditions
(7) Include all control valves or other system features that could significantly affect the flow of water through the distribution system (i.e. interconnections with other systems, pressure reducing valves between pressure zones) reflecting various operating conditions.
(8) Impose peak day and peak instantaneous demands to the water system's facilities. These demands may be peak day and peak instantaneous demands per R309-510, the reduced demand approved by the Executive Secretary per R309-510-5, or the demands experienced by the water system which are higher than the values listed in R309-510. This may require multiple model simulations to account for the varying water demand conditions. In some cases, extended period simulations are needed to evaluate changes in operating conditions over time. This will depend on the complexity of the water system, extent of anticipated fire event and nature of the new expansion.
(9) Calibrate the model to adequately represent the actual field conditions using field measurements and observations.
(10) If fire hydrants are connected to the distribution system, account for fire suppression requirements specified by local fire authority or use the default values stated in R309-510-9(4). For significant fire suppression demand, extended simulations must contain the run time for the period of anticipated fire event. In some cases, a steady state model may be sufficient for residential fire suppression demand.
(11) Account for
demand] if the drinking water system supplies [ irrigation] water
R309-511-6. Elements of the Public Water System or Its Agent's Certification.
(1) The public water system or its agent's certification.
The public water system or its agent shall, after a thorough review, submit a document to the Executive Secretary certifying that the following requirements have been met:
(a) The hydraulic model requirements as set forth in rule R309-511-5.
(b) The appropriate demand requirements as specified in this rule and rule R309-510 have been used to evaluate various operating conditions of the public drinking water system.
(c) The hydraulic model predicts that new construction will not result in any service connection within the new expansion area not meeting the minimum distribution system pressures as specified in R309-105-9.
(d) The hydraulic model predicts that new construction will not decrease the pressures within the existing water system to such that the minimum distribution system pressures as specified in R309-105-9 are not met.
(e) The calibration methodology is described and the model is sufficiently accurate to represent conditions likely to be experienced in the water delivery system.
(f) Identify the hydraulic modeling method, and if computer software was used, the software name and version used.
(2) The format of the public water system or its agent's submission.
The public water system or its agent shall submit to the Executive Secretary the following documentation:
(a) The certification as required in R309-511-6(1). The certification shall be signed, dated, and stamped by a registered professional engineer, licensed to practice in the State of Utah.
(b) A Hydraulic Model Design Elements Report (see R309-511-7). The document shall be signed, dated, and stamped by a registered professional engineer, licensed to practice in the State of Utah.
(c) For community public water systems, the water system management shall certify that they have received a copy of input and output data for the hydraulic model with the simulation showing the worst case results in terms of water system pressure and flow.
(3) The submission of supporting documentation.
The public water system or its agent shall submit a System Capacity and Expansion Report (see R309-511-8) if requested by the Executive Secretary. The document shall be signed, dated, and stamped by a registered professional engineer, licensed to practice in the State of Utah.
R309-511-7. Hydraulic Model Design Elements Report.
The public water system or its agent shall prepare a Hydraulic Model Design Elements Report along with and in support of the certification stated in R309-511-6(1). The Hydraulic Model Design Elements Report shall contain, and is not limited to, the following elements:
(1) If the public drinking water system
provides water for [
irrigation] the report must describe the criteria used
to estimate this demand. If the irrigation demand map in
R309-510-7(3) is not used, the report shall provide justification
for the alternative demands used in the model. If the irrigation
demands are based on the map in R309-510-7(3) the report must
identify the irrigation zone number, a statement and/or map of how
the irrigated acreage is spatially distributed, and the total
estimated irrigated acreage. The indicated irrigation demands must
be used in the model simulations.
(2) The total number of connections served by the water system including existing connections and anticipated new connections served by the water system after completion of the construction of the project.
(3) The total number of equivalent residential connections (ERC) including both existing connections as well as anticipated new connections associated with the project. The number of ERC's must include high as well as low volume water users. The determination of the equivalent residential connections shall be based on flow requirements using the anticipated demand as outlined in R309-510, or based on alternative sources of information that are deemed acceptable by the Executive Secretary.
(4) Provide methodology used for calculating demand and allocating it to the model; a summary of pipe length by diameter; a hydraulic schematic of the distribution piping showing pressure zones, general pipe connectivity between facilities and pressure zones, storage, elevation and sources; and a list or ranges of values of friction coefficient used in the hydraulic model according to pipe material and condition in the system. All coefficients of friction used in the hydraulic analysis shall be consistent with standard practices.
(5) A statement stating either "yes fire hydrants exist or will exist within the system" or "there are no fire hydrants connected to the system and there is no plan to add fire hydrants with this project." Either statement will require the identification of the local fire authority's name, address, and contact information, as well as the fire flow quantity and duration if required.
(6) The locations of the lowest pressures within the distribution system, and areas identified by the hydraulic model as not meeting each scenario of the minimum pressure requirements in R309-105-9.
(7) Calibration method and quantitative summary of the calibration results (i.e., comparison tables, graphs).
. . . . . . .
KEY: drinking water, hydraulic modeling
Date of Enactment or Last Substantive Amendment: [
Authorizing, and Implemented or Interpreted Law: 19-4-104
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For questions regarding the content or application of this rule, please contact Ying-Ying Macauley at the above address, by phone at 801-536-4188, by FAX at 801-536-4211, or by Internet E-mail at email@example.com; Bob Hart at the above address, by phone at 801-536-0054, by FAX at 801-536-4211, or by Internet E-mail at firstname.lastname@example.org.