 IMPACT OF COMMERCIAL CUSTOMERS
APPLICATION
This Code of Practice defines the methodology employed to determine the impact of commercial customers
on the water supply, distribution, and wastewater collection, treatment and disposal operations.
The Code of Practice applies to any non-residential customer, and to other establishments or uses where the
GWR Engineer has determined the impact will be greater than a residential customer.
METHODOLOGY
In order to assess the impact of a commercial operation on the Utility’s supply and treatment
infrastructures, GWR employs a fixture unit (FU) review as compared to a typical residential unit. This
analysis ensures that the peak water and wastewater demands are accounted for, and a proper allocation of
resources. Fixture unit allocations are developed from the Unified Plumbing Code (UPC). In cases where
no direct FU allocation exists in the UPC, the GWR Engineer will assign a value.
The total FU count is compared to the typical residential fixture unit counts to determine the Equivalent
Development Unit (EDU) value, which is used for determining capacity fees, hook-up fees and other
impact related metrics used by the Utility in maintaining its Capacity Management and Operations
Management Plan.
For the purposes of this Code of Practice, the following Residential Fixture Unit values are employed:
Residential Water Use 46 FUs
Residential Sewer Use 44 FUs
An example of this calculation is shown in the accompanying table:
| |
|
COMMERCIAL
WATER |
COMMERCIAL
SEWER |
| Item |
FU's |
Number Total (Water) |
Number Total Sewer |
| Urinals Stall/Wall |
4 |
2 8 |
2 8 |
| Pedestal/Siphon |
12 |
|
|
| Sinks |
|
|
|
| Bar |
2 |
|
|
| Industrial Wash-Up |
6 |
0 0 |
0 0 |
| Kitchen |
4 |
2 8 |
2 8 |
| Lavatory |
2 |
6 12 |
6 12 |
| Showers |
4 |
|
|
| Floor Drains |
4 |
|
|
| Grease & Solids |
6 |
|
|
| Dishwashers |
|
|
|
| Conveyor |
100 |
|
|
| Under Counter |
10 |
1 10 |
1 10 |
| Residential |
8 |
|
|
| Disposals |
50 |
|
|
| Clothes Washer |
|
|
|
| Residential |
4 |
|
|
| Automatic 8 lb |
16 |
|
|
| Automatic 12-19 lb |
20 |
|
|
| Automatic 20-39 lb |
22 |
|
|
| Automatic 40-50 lb |
24 |
|
|
| Drinking Fountains |
2 |
2 4 |
2 4 |
| Water Closet |
|
|
|
| Tank |
8 |
|
|
| Flush Valve |
12 |
6 72 |
6 72 |
| Hose Bibs |
2 |
2 4 |
|
| Landscaping |
12 /1000 sq ft |
250 3 |
|
| Swimming Pool |
5 /100 sq ft |
6550 327.5 |
|
| Swimming Pool Filter Backwash |
10 |
|
1 10 |
| Cooling Water |
15 /ton |
|
|
| |
|
|
|
| |
|
|
|
| |
TOTAL
Factor |
448.5 FU's
9.75 |
136 FU's
3.09 |
| |
|
|
|
In this case, the impact of the Commercial Customer is equivalent to 9.75 residential units with respect to
water, and 3.09 residential units with respect to water.
COMMERCIAL APPLICANT REQUIRMENTS
Prior to applying for water service, a Non-Residential Customer shall provide plans of the proposed
structure in sufficient detail for GWR to analyze the impact.
REVISIONS
| Date |
Revision Number |
Revisions |
OPI |
| 20-Apr-04 |
ORIGINAL (000) |
|
GSS |
| 13-Nov-06 |
001 |
General review and re-number |
GSS |
|
