Utah Administrative Code
The Utah Administrative Code is the body of all effective administrative rules as compiled and organized by the Division of Administrative Rules (Subsection 63G-3-102(5); see also Sections 63G-3-701 and 702).
NOTE: For a list of rules that have been made effective since March 1, 2010, please see the codification segue page.
Rule R309-510. Facility Design and Operation: Minimum Sizing Requirements.
As in effect on March 1, 2010
Table of Contents
- R309-510-1. Purpose.
- R309-510-2. Authority.
- R309-510-3. Definitions.
- R309-510-4. General.
- R309-510-5. Reduction of Requirements.
- R309-510-6. Water Conservation.
- R309-510-7. Source Sizing.
- R309-510-8. Storage Sizing.
- R309-510-9. Distribution System Sizing.
- KEY
- Date of Enactment or Last Substantive Amendment
- Notice of Continuation
- Authorizing, Implemented, or Interpreted Law
R309-510-1. Purpose.
This rule specifies requirements for the sizing of public drinking water facilities such as sources (along with their associated treatment facilities), storage tanks, and pipelines. It is intended to be applied in conjunction with R309-500 through R309-550. Collectively, these rules govern the design, construction, operation and maintenance of public drinking water system facilities. These rules are intended to assure that such facilities are reliably capable of supplying adequate quantities of water which consistently meet applicable drinking water quality requirements and do not pose a threat to general public health.
R309-510-2. Authority.
This rule is promulgated by the Drinking Water Board as authorized by Title 19, Environmental Quality Code, Chapter 4, Safe Drinking Water Act, Subsection 104(1)(a)(ii) of the Utah Code and in accordance with Title 63G, Chapter 3 of the same, known as the Administrative Rulemaking Act.
R309-510-3. Definitions.
Definitions for certain terms used in this rule are given in R309-110 but may be further clarified herein.
R309-510-4. General.
This rule provides estimates of quantities and flow rates which shall be used in the design of new systems, or if there is an absence of data collected by the public water system meeting the required confidence level for a reduction mentioned below, when evaluating water sources, storage facilities and pipelines. Within each of these three broad categories, the designer shall ascertain the contributions on demand from the indoor use of water, the outdoor use of water, and fire suppression activities (if required by local authorities). These components must be added together to determine the total demand on a given facility.
R309-510-5. Reduction of Requirements.
If acceptable data are presented, certain number of days of peak day demand to establish minimum source capacity; certain number of years of annual demand to establish minimum water right requirements; and certain number of readings of peak hourly demand to establish minimum peak instantaneous demand; showing that the requirements made herein are excessive for a given project, the requirements may be appropriately reduced to the 90th percentile of readings, on a case by case basis by the Executive Secretary. In the case of Recreational Home Developments, in order to qualify for a quantity reduction, not only must the actual water consumption be less than quantities required by rule but enforceable policy restrictions must have been approved which prevent the use of such dwellings as a permanent domicile and these restrictions shall have been consistently enforced. The Executive Secretary may re-consider any reduced minimums if the nature and use of the system changes.
R309-510-6. Water Conservation.
This rule is based upon typical current water consumption patterns in the State of Utah. They may be excessive in certain settings where legally enforceable water conservation measures exist. In these cases the requirements made in this section may be reduced on a case-by-case basis by the Executive Secretary.
R309-510-7. Source Sizing.
(1) Peak Day Demand and Average Yearly Demand.
Sources shall legally and physically meet water demands under two separate conditions. First, they shall meet the anticipated water demand on the day of highest water consumption. This is referred to as the peak day demand. Second, they shall also be able to provide one year's supply of water, the average yearly demand.
(2) Estimated Indoor Use.
In the absence of firm water use data, Tables 510-1 and 510-2 shall be used to estimate the peak day demand and average yearly demand for indoor water use.
TABLE 510-1
Source Demand for Indoor Use
Type of Connection Peak Day Demand Average Yearly Demand
Year-round use
Residential 800 gpd/conn 146,000 gal./conn
ERC 800 gpd/ERC 146,000 gal./ERC
Seasonal/Non-residential use
Modern Recreation Camp 60 gpd/person (see note 1)
Semi-Developed Camp
a. with pit privies 5 gpd/person (see note 1)
b. with flush toilets 20 gpd/person (see note 1)
Hotel, Motel, and Resort 150 gpd/unit (see note 1)
Labor Camp 50 gpd/person (see note 1)
Recreational Vehicle Park 100 gpd/pad (see note 1)
Roadway Rest Stop 7 gpd/vehicle (see note 1)
Recreational Home Development 400 gpd/conn (see note 1)
Note 1. Annual demand shall be based on the number of days the
system will be open during the year times the peak day demand
unless data acceptable to the Division, with a confidence level of
90% or greater showing a lesser annual consumption, can be presented.
TABLE 510-2
Source Demand for Individual Establishments(a)
(Indoor Use)
Type of Establishment Peak Day Demand
(gpd)
Airports
a. per passenger 3
b. per employee 15
Boarding Houses
a. for each resident boarder and employee 50
b. for each nonresident boarders 10
Bowling Alleys, per alley
a. with snack bar 100
b. with no snack bar 85
Churches, per person 5
Country Clubs
a. per resident member 100
b. per nonresident member present 25
c. per employee 15
Dentist's Office
a. per chair 200
b. per staff member 35
Doctor's Office
a. per patient 10
b. per staff member 35
Fairgrounds, per person 1
Fire Stations, per person
a. with full-time employees and food prep. 70
b. with no full-time employees and no food prep. 5
Gyms
a. per participant 25
b. per spectator 4
Hairdresser
a. per chair 50
b. per operator 35
Hospitals, per bed space 250
Industrial Buildings, per 8 hour shift,
per employee (exclusive of industrial waste)
a. with showers 35
b. with no showers 15
Launderette, per washer 580
Movie Theaters
a. auditorium, per seat 5
b. drive-in, per car space 10
Nursing Homes, per bed space 280
Office Buildings and Business Establishments,
per shift, per employee (sanitary wastes only)
a. with cafeteria 25
b. with no cafeteria 15
Picnic Parks, per person (toilet wastes only) 5
Restaurants
a. ordinary restaurants (not 24 hour service) 35 per seat
b. 24 hour service 50 per seat
c. single service customer utensils only 2 per customer
d. or, per customer served
(includes toilet and kitchen wastes) 10
Rooming House, per person 40
Schools, per person
a. boarding 75
b. day, without cafeteria, gym or showers 15
c. day, with cafeteria, but no gym or showers 20
d. day, with cafeteria, gym and showers 25
Service Stations(b) ,per vehicle served 10
Skating Rink, Dance Halls, etc., per person
a. no kitchen wastes 10
b. Additional for kitchen wastes 3
Ski Areas, per person (no kitchen wastes) 10
Stores
a. per public toilet room 500
b. per employee 11
Swimming Pools and Bathhouses(c) ,per person 10
Taverns, Bars, Cocktail Lounges, per seat 20
Visitor Centers, per visitor 5
NOTES FOR TABLE 510-2:
1. Source capacity must at least equal the peak day
demand of the system. Estimate this by assuming the facility
is used to its maximum.
2. Generally, storage volume must at least equal one
average day's demand.
3. Peak instantaneous demands may be estimated by
fixture unit analysis as per Appendix E of the 2006
International Plumbing Code.
(a) When more than one use will occur, the multiple
use shall be considered in determining total demand.
Small industrial plants maintaining a cafeteria and/or showers
and club houses or motels maintaining swimming pools and/or
laundries are typical examples of multiple uses. Uses other
than those listed above shall be considered in relation to
established demands from known or similar installations.
(b) or 250 gpd per pump,
(c) 20 x {Water Area (Ft2) / 30} + Deck Area (Ft2)
(3) Estimated Outdoor Use.
In the absence of firm water use data, Table 510-3 shall be used to estimate the peak day demand and average yearly demand for outdoor water use. The following procedure shall be used:
(a) Determine the location of the water system on the map entitled Irrigated Crop Consumptive Use Zones and Normal Annual Effective Precipitation, Utah as prepared by the Soil Conservation Service (available from the Division). Find the numbered zone, one through six, in which the water system is located (if located in an area described "non-arable" find nearest numbered zone).
(b) Determine the net number of acres which may be irrigated. This is generally done by starting with the gross acreage, then subtract out any area of roadway, driveway, sidewalk or patio pavements along with housing foundation footprints that can be reasonably expected for lots within a new subdivision or which is representative of existing lots. Before any other land area which may be considered "non-irrigated" (e.g. steep slopes, wooded areas, etc.) is subtracted from the gross area, the Division shall be consulted and agree that the land in question will not be irrigated.
(c) Refer to Table 510-3 to determine peak day demand and average yearly demand for outdoor use.
(d) The results of the indoor use and outdoor use tables shall be added together and source(s) shall be legally and physically capable of meeting this combined demand.
TABLE 510-3
Source Demand for Irrigation
(Outdoor Use)
Map Zone Peak Day Demand Average Yearly Demand
(gpm/irrigated acre) (AF/irrigated acre)
1 2.26 1.17
2 2.80 1.23
3 3.39 1.66
4 3.96 1.87
5 4.52 2.69
6 4.90 3.26
(4) Accounting for Variations in Source Yield.
The design engineer shall consider whether flow from the source(s) may vary. Where flow varies, as is the case for most springs, the minimum flowrate shall be used in determining the number of connections which may be supported by the source(s). Where historical records are sufficient, and where peak flows from the source(s) correspond with peak demand periods, the Executive Secretary may grant an exception to this requirement.
R309-510-8. Storage Sizing.
(1) General.
Each storage facility shall provide:
(a) equalization storage volume, to satisfy average day demands for water for indoor use as well as outdoor use,
(b) fire suppression storage volume, if the water system is equipped with fire hydrants and intended to provide fire suppression water, and
(c) emergency storage, if deemed appropriate by the water supplier or the Executive Secretary, to meet demands in the event of an unexpected emergency situation such as a line break or a treatment plant failures.
(2) Equalization Storage.
(a) All public drinking water systems shall be provided with equalization storage. The amount of equalization storage which must be provided varies with the nature of the water system, the extent of outdoor use and the location of the system.
(b) Required equalization storage for indoor use is provided in Table 510-4. Storage requirements for non-community systems not listed in this table shall be determined by calculating the average day demands from the information given in Table 510-2.
TABLE 510-4
Storage Volume for Indoor Use
Type Volume Required
(gallons)
Community Systems
Residential;
per single resident service connection 400
Non-Residential;
per Equivalent Residential Connection (ERC) 400
Non-Community Systems
Modern Recreation Camp; per person 30
Semi-Developed Camp; per person
a. with Pit Privies 2.5
b. with Flush Toilets 10
Hotel, Motel and Resort; per unit 75
Labor Camp; per unit 25
Recreational Vehicle Park; per pad 50
Roadway Rest Stop; per vehicle 3.5
Recreational Home Development; per connection 400
(c) Where the drinking water system provides water for outdoor use, such as the irrigation of lawns and gardens, the equalization storage volumes estimated in Table 510-5 shall be added to the indoor volumes estimated in Table 510-4. The procedure for determining the map zone and irrigated acreage for using Table 510-5 is outlined in Section R309-510-7(3).
TABLE 510-5
Storage Volume for Outdoor Use
Map Zone Volume Required
(gallons/irrigated acre)
1 1,782
2 1,873
3 2,528
4 2,848
5 4,081
6 4,964
(3) Fire Suppression Storage.
Fire suppression storage shall be required if the water system is intended to provide fire fighting water as evidenced by fire hydrants connected to the piping. The design engineer shall consult with the local fire suppression authority regarding needed fire flows in the area under consideration. This information shall be provided to the Division. Where no local fire suppression authority exists, needed fire suppression storage shall be assumed to be 120,000 gallons (1000 gpm for 2 hours).
(4) Emergency Storage.
Emergency storage shall be considered during the design process. The amount of emergency storage shall be based upon an assessment of risk and the desired degree of system dependability. The Executive Secretary may require emergency storage when it is warranted to protect public health and welfare.
R309-510-9. Distribution System Sizing.
(1) General Requirements.
The distribution system shall be designed to insure that minimum water pressures as required in R309- 105-9 exist at all points within the system. If the distribution system is equipped with fire hydrants, the Division will require a letter from the local fire authority stating the fire flow and duration required of the area to insure the system shall be designed to provide minimum pressures as required in R309-105-9 to exist at all points within the system when needed fire flows are imposed upon the peak day demand flows of the system.
(2) Indoor Use, Estimated Peak Instantaneous Demand.
(a) For community water systems and large non-community systems, the peak instantaneous demand for each pipeline shall be assumed for indoor use as:
Q = 10.8 x N0.64
where N equals the total number of ERC's, and Q equals the total flow (gpm) delivered to the total connections served by that pipeline.
For Recreational Vehicle Parks, the peak instantaneous flow for indoor use shall be based on the following:
TABLE 510-6
Peak Instantaneous Demand for Recreational Vehicle Parks
Number of Connections Formula
0 to 59 Q = 4N
60 to 239 Q = 80 + 20N0.5
240 or greater Q = 1.6N
NOTES FOR TABLE 510-6:
Q is total peak instantaneous demand (gpm) and N is the
maximum number of connections. However, if the only water use
is via service buildings the peak instantaneous demand shall
be calculated for the number of fixture units as presented in
Appendix E of the 2006 International Plumbing Code.
(b) For small non-community water systems the peak instantaneous demand to be estimated for indoor use shall be calculated on a per-building basis for the number of fixture units as presented in Appendix E of the 2006 International Plumbing Code.
(3) Outdoor Use, Estimated Peak Instantaneous Demand.
Peak instantaneous demand to be estimated for outdoor use is given in Table 510-7. The procedure for determining the map zone and irrigated acreage for using Table 510-7 is outlined in Section R309-510-7(3).
TABLE 510-7
Peak Instantaneous Demand for Outdoor Use
Map Zone Peak Instantaneous Demand
(gpm/irrigated acre)
1 4.52
2 5.60
3 6.78
4 7.92
5 9.04
6 9.80
(4) Fire Flows.
(a) Distribution systems shall be designed to deliver needed fire flows if fire hydrants are provided. The design engineer shall consult with the local fire suppression authority regarding needed fire flows in the area under consideration. This information shall be provided to the Division. Where no local fire suppression authority exists, needed fire flows shall be assumed to be 1000 gpm unless the local planning commission provides a letter indicating that the system will not be required to provide any fire flows, in which case fire hydrants will not be allowed to be installed on any mains.
(b) If a distribution system is equipped with fire hydrants, the system shall be designed to insure that minimum pressures required by R309-105-9 exist at all points within the system when fire flows are added to the peak day demand of the system. Refer to Section R309-510-7 for information on determining the peak day demand of the system.
KEY
drinking water, minimum sizing, water conservation
Date of Enactment or Last Substantive Amendment
April 27, 2009
Notice of Continuation
April 2, 2007
Authorizing, Implemented, or Interpreted Law
19-4-104
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