HomeMy WebLinkAbout25-Water Service Length Departure MemoMEMORANDUM PAGE 1 OF 2 FEBRUARY 2025
MEMORANDUM
To: City of Bozeman Community Development
From: Sanbell
Date: February 7, 2025
Reference: Mill Building Sewer and Water Design Report
SITE NARRATIVE
The purpose of this memorandum is to formally request a departure from the maximum water
service length in the BMC 38.410.070.B.2 and summarize the available pressure at the proposed
Mill building given the demand calculation assumptions of the proposed domestic water service.
The domestic water service line will connect to the existing 6-inch water main in East Cottonwood
Street.
WATER
Our team requests a departure from the UDC’s maximum service line length from the water main
to the structure. Due to the renovation of the existing Mill building and an effort to retain the
usable existing space as much as possible, we are proposing extending the water service to the
northern extent of the proposed building expansion to the existing structure. The code maximum
water service length is 150-feet. We are proposing a 3/4-inch diameter water service length of 170-
feet. The pressure provided by the existing water main is approximately 144 psi. The pressure loss
through the approximately 170-feet of new 3/4-inch domestic service is approximately 46 psi,
resulting in an expected pressure available at the building of 98 psi. As proposed, from a hydraulic
capacity standpoint, the expected pressure is more than adequate to service the building. Refer to
the Sewer and Water Design report for additional information and Appendix A of this
memorandum.
CONCLUSION
Based on the assumptions provided above, the 3/4-inch water service installation will provide the
MEMORANDUM PAGE 2 OF 2 FEBRUARY 2025
required capacity for the proposed Mill building renovation and expansion. Please contact Bobby
Egeberg, PE for any questions pertaining to this memorandum by email, begeberg@sanbell.com or
by phone 406-922-4308.
Appendices
Appendix A – Hydraulic Model Results
MILL BUILDING RENOVATION Project # 06020.12 APPENDIX A HYDRAULIC MODEL RESULTS