5.10 Water System Capacity
a. General:
1) In areas not addressed in the Water Master Plan, design capacities shall be determined by consideration of the following factors and assumptions:
a) Area to be serviced, both immediate and adjacent.
b) Current and projected population within the areas to be served.
c) Current and projected land use within the areas to be served.
d) Commercial, industrial, or institutional users to be served.
e) Changes in any of the above factors which are likely to occur within a foreseeable time period.
2) In the absence of consumption data or other reliable information, the following factors may be assumed:
a) Peak hour demands as follows:
(1) 5 gpm per single family residential
(2) 2.5 gpm per dwelling unit for multiple family residential
(3) 5,000 gal/ac/day for commercial development
(4) 10,000 gal/ac/day for industrial development
b) Demand for unique commercial installations, industrial users, PUD's, multiple and institutional developments shall be calculated on an individual basis.
b. Fire Flow Requirements.
1) Unless otherwise approved or required by the City Engineer and the local Fire Chief, minimum fire flows shall be as follows:
|
Land Use |
Fire Flow (gpm) |
Duration (hours) |
|---|---|---|
|
Residential |
||
|
R-2 |
1,500 |
2 |
|
R-3 |
2,500 |
2 |
|
Multiple Family |
3,000 |
3 |
|
Commercial |
3,500 |
3 |
|
Industrial |
4,000 |
4 |
|
Public (Schools & Institutions) |
3,500 |
3 |
**These values do not supersede or take the place of Oregon Fire Code (OFC) or Oregon Building Code fire flow requirements. Higher values may be necessary based on the OFC, Fire Marshall or ISO requirements. Reductions may be allowed by the Fire Chief for buildings with fire sprinkler systems.
2) In all cases, all new fire hydrants shall be capable of delivering a minimum of 1,500 gpm at 20 psi residual system pressure. This requirement will apply independently to each phase of multi-phase projects.