327 IAC 8-3.3-2 - Calculation of public water system quantity requirement standards for average and peak demand conditions

Authority: IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3-1; IC 13-18-4-1

Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-2

Sec. 2.

(a) The calculated average and peak flowrate values required for a water main extension to a public water system shall be equal to the average and peak daily consumer demands of the proposed additional service connections calculated as follows:

(1) The public water supply quantity requirement for the average daily consumer demand for residential service connections shall be determined by using a general average daily demand value. The following method shall be used to calculate average and peak supply quantity requirements:

ADCD = (General Avg) × PRSC

PDCD = (ADCD × PF) + FF

Where: ADCD = Average daily consumer demand in gallons per residential service connection per day.

PDCD = Peak daily consumer demand in gallons per residential service connection per day.

General Avg = General average daily consumer demand value of five hundred (500) gallons per residential service connection per day. PRSC = Proposed number of residential service connections.

PF = Peak daily consumer demand factor of two and one-half (2.5).

FF = Fire flow demand value equal to the fire protection flowrate provided by the public water system or zero (0) if the public water system is not providing fire protection.

(2) The public water supply quantity requirement for the average and peak daily consumer demand for residential service connections may be determined from the monthly reports of operations (MROs) as follows:

(A) The following method may be used to calculate average and peak supply quantity requirements for a public water system that has been in operation for at least ten (10) years and has an accurate record of MROs for that time period:

ADCD = (Max Average) × PRSC

PDCD = (ADCD × PF) + FF

Where: ADCD = Average daily consumer demand in gallons per residential service connection per day.

PDCD = Peak daily consumer demand in gallons per residential service connection per day.

Max Average = Maximum average daily consumer demand in gallons per service connection as calculated by:

Max Average = (ADCD10) ÷ (SC10)

Where: ADCD10 = The highest average daily demand as reported on the MROs over the previous ten (10) year period.

SC10 = The number of service connections at ADCD10. PRSC = Proposed number of residential service connections. PF = Peak daily demand factor as calculated by the following:

PF = MDD10 ÷ 10YADD

Where: MDD10 = The maximum single day demand as reported on the MROs over the previous ten (10) year period.

10YADD = The ten (10) year average daily demand as calculated from the previous ten (10) year period.

FF = Fire flow demand value equal to the fire protection flowrate provided by the public water system or zero (0) if the public water system is not providing fire protection.

(B) If a public water service has not been in operation for at least ten (10) years, then all available MROs shall be used to determine the highest average daily demand (ADCD10), the number of service connections at ADCD10 (SC10), the maximum single day demand (MDD10), and the ten (10) year average daily demand (10YADD).

(3) The public water supply quantity requirement for the average and peak daily consumer demand for service connections described by Table 2-1 in subsection (b). The following method may be used to calculate the average and peak public water supply quantity requirements:

ADCD = DCF × PSC

PDCD = (ADCD × PF) + FF

Where: ADCD = Average daily consumer demand in gallons per service connection per day.

PDCD = Peak daily consumer demand in gallons per service connection per day.

DCF = Demand calculation factors as contained in Table 2-1 in subsection (b).

PSC = Proposed number of service connections.

PF = Peak daily consumer demand factor of two and one-half (2.5).

FF = Fire flow demand value equal to the fire protection flowrate provided by the public water system or zero (0) if the public water system is not providing fire protection.

(4) If the average and peak daily consumer demand cannot be determined or calculated using the methods described in subdivision (1), (2), or (3), the determination of the average and peak daily consumer demand must be approved by the commissioner. The source and any calculations or assumptions must be approved by the commissioner. (b) The following demand calculation factors shall be used in the calculations under subsection(a)(3):

Table 2-1 Demand Calculation Factors (DCF)

Service Connection Description	DCF (gallons per day)
Airport	3 per passenger plus 20 per employee
Assembly Hall	3 per seat
Bar (without Food Service)	10 per seat
Beauty Salon	35 per customer
Bowling Alley (with Bar and/or Food)	125 per lane
Bowling Alley (without Food Service)	75 per lane
Bus Station	3 per passenger
Campground Organizational with Flush Toilets	40 per camper
Campground Organizational without Flush Toilets	20 per camper
Campground Recreational with Individual Sewer Connection	100 per campsite
Campground Recreational without Individual Sewer Connection	50 per campsite
Church with Kitchen	5 per sanctuary seat
Church without Kitchen	3 per sanctuary seat
Correctional Facilities	120 per inmate
Day Care Center	20 per person
Dentist	750 per chair plus 75 per employee
Factory with Showers	35 per employee
Factory without Showers	20 per employee
Food Service Operations Cocktail Lounge	35 per seat
Food Service Operations Restaurant, not Open 24 Hours	35 per seat
Food Service Operations Restaurant, Open 24 Hours	50 per seat
Food Service Operations Restaurant, open 24 hours and Located Along an Interstate	70 per seat
Food Service Operations Tavern	35 per seat
Food Service Operations Curb Service (Drive-In)	50 per car space
Hospital, Medical Facility	200 per bed
Hotel	100 per room
Kennel	20 per animal enclosure
Mental Health Facility	100 per patient
Motel	100 per room
Nursing Home	100 per bed
Office Building	20 per employee
Outpatient Surgical Center	50 per patient
Picnic Area	5 per visitor
School Elementary	15 per pupil
School Secondary	25 per pupil
School with Dormitory	100 per bed
Service Station (Gas Station)	400 per restroom
Shopping Center	0.1 per square foot of floor space, plus
20 per employee
Swimming Pool Bathhouse	10 per swimmer
Theater Drive-In	5 per car space
Theater Inside Building	5 per seat

Notes

327 IAC 8-3.3-2

Water Pollution Control Board; 327 IAC 8-3.3-2; filed Mar 31, 1999, 1:50 p.m.: 22 IR 2508; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA Readopted filed Jun 6, 2019, 1:59 p.m.: 20190710-IR-327190246BFA