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1Sanitary Sewer Analysis Results
For
Montava Phase
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July 16,
submitted to:
Boxelder Sanitation
District
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T, INC. CONSULTING ENGINEERS
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Montava Phase D Sanitary Sewer Analysis
1.0 Introduction
1.1 Scope and Purpose
This report presents the results of the Sanitary Sewer Analysis for the Montava Phase D
Subdivision in Fort Collins, Colorado. This sanitary plan was prepared to identify infrastructure
needs as the area develops. Montava Phase D is surrounded by future Montava Subdivision
Phases, so the sanitary lines built with Phase D will be utilized to service the current and future
phases. Certain assumptions were made concerning the development of the future surrounding
properties. Updates to this Master Plan will be needed as plans for the future development of the
area are finalized and changes to the overall concept necessitate an update.
1.2 Project Location and Description
The proposed Montava Phase D Subdivision site is located west of N Giddings Rd between
Richards Lake Rd and Mountain Vista Dr in Fort Collins, Colorado and consists of
approximately 52 acres of undeveloped land. The proposed development contains 329 Single
Family lots, Tracts intended for future multi-family development, and open space.
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Page 1
Montana Phase D Sanitary Sewer Analysis
1.3 Existing Conditions
The existing infrastructure around the Montava Subdivision includes a 21" Boxelder Sanitation
District trunk line that runs through the middle of the proposed Montava Phase D site. This 21"
trunk line carries effluent flow southeast through the Montava Subdivision. The layout of this
existing trunk line can be seen in Appendix A.
2.0 Design Criteria and Assumptions
2.1 Sanitary Design Criteria and Assumptions
The Boxelder Sanitation Districts Standards in combination with the Fort Collins Utilities Water and
Wastewater Design Criteria Manual, adopted on May 2, 2017 was used to design the alignment,
elevations, and sizing of internal sewer systems for Phase D.
The future Montava Phases were based on the Montava Development Yield Estimate for Water
System Analysis which can be seen in Appendix B. This yield estimate was used to determine the
number of dwelling units as well as the square footage of commercial/employment buildings for
each phase.
Sanitary Design Criteria
• Average Daily Residential Demand = 75 gal/capita/day
• Average People per Dwelling Unit = 3 capita/DU
• School Site = 1,020 gal/day/ac
• Commercial Demand = 200 gal/day/1000 sq ft
• Peaking Factor= 2.6 x Q average daily,cfs 0.16
• Infiltration & Inflow = 0.347 gpm/ac
• The minimum and maximum velocity at the design flow rate shall be two (2) fps
and ten (10)fps respectively
• Manning's Equation Friction Factor ("n") = 0.010
3.0 Proposed Sanitary Layout
3.1 Proposed Conditions
The proposed sanitary consists of 15", 12", and 8" main lines that outfall into the existing 21"
Boxelder sanitary trunk line. Two connections to this existing mainline are proposed and the
extents of each sanitary "basin" along with the proposed sanitary sewer layout of Phase D and
approximate locations of future sanitary lines can be seen in the exhibit located in Appendix C.
The sewer sizing and layout has been determined based on demand calculations and analysis
that is discussed in section 4.0 of this report.
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ENGINEERS
Page 2
Montava Phase D Sanitary Sewer Analysis
4.0 Sanitary Sewer Analysis and Results
4.1 Sanitary Sewer Demand Calculations
The previously mentioned criteria and assumptions were used to calculate the average day
residential and non-residential sanitary flows from each lot, tract, and future phase.
The average day effluent flow was applied to its associated upstream manhole and the cumulative
base flow was determined through each stretch of pipe. A peaking factor was determined from
each cumulative base flow value. Infiltration and inflows were determined based on the cumulative
area flowing to each manhole.
The peak effluent flow through each pipe was then determined by multiplying the cumulative base
flow by the peaking factor and adding the cumulative infiltration and inflow.
The peak effluent flow was converted from gallons per minute (gpm) to cubic feet per second (cfs).
The peak flow was then input into FlowMaster (10.03.00.03) where the Manning Formula was
utilized to determine velocities and flow depths within each pipe during peak events. All
calculations were done in an Excel spreadsheet and the velocities and % Full (d/D) values were
taken from FlowMaster and summarized within the Excel spreadsheet provided in Appendix D.
4.2 Sanitary Sewer Analysis and Results
Based on the result, the peak flow scenario indicated no modeled pipes exceeded a d/D capacity
of 80%. Four pipes slightly exceeded 50% d/D using the peak flow scenario. The total peak effluent
discharge was also calculated and determined to be adequately handled by the existing 21" trunk
line.
5.0 Conclusions and Recommendations
The Montava Phase D sanitary sewer has been designed to meet the Boxelder Sanitation District
Design Criteria and to adequately service the proposed and future Montava Subdivision. If there
are any questions or additional information needed, please do not hesitate to contact us.
6.0 Appendices
Appendix A - Existing Conditions
Appendix B - Density Assumptions
Appendix C - Proposed Sanitary Layout
Appendix D - Sanitary Sewer Analysis Results
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Facilities Pipe Diameter Pressure Mains Larimer Parcel C <all other values> 0 DRI • AEI O PRO
Ep SgOiFe� 0 700 1,400
.) WWTP 6,8, 10 in CDOT Force Main
0 0 BSD MH By Sub-basin DRI/PRI • BSI O RAPS
m Lift Station 12, 15, 16, 18 in Timnath Force Main 0 CIS OCI O CDOT O TMG <Title> Feet
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E1 Points 24 in Walker Mfg.Force Main O BXI • PDI O PLT • WMPS
Farnsworth
Production Date:
�27,30,42 in E1 Force Main • CSI GROUP
UP
2/20/2018 Pipe labels are
length,diameter,a type Jetter Sensitive Harmony Ridge FM
Preliminary Pipe
Montava Yield Estimate By Phase
May 26,2021
----------
--------------------
f ' FARM
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Estimated Units By Type and Phase
Unit Type Phase Total
ID Name A B c D E F G H 1 J K L M N O # %SF %MF
50 du 29.do 31 du 18 du 41 du 169 du 6%
76 du 58 du 70 du 17 du 43 du 62 du 23 du 55 du 30 du 434 du 17%
66 du 58 du 40 du 65 du 24 du 42 du 26 du 51 du 64 du 48 du 484 du 19% 39%MF
.........
....................
........------........------- ._---
---
---
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_._______-._-........------
.........------
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......'----"_'___________.................................
76 du 70 du 49 tlu 81 tlu 52 du 37 tlu 60 du 50 tlu 89 du 48 du 612 du 23%
....................................................................................................................................................................._------------------------------
60du 47 du 102 du 204 tlu 71 du 56 du 31 du 90 tlu 68 du 89 tlu 32 du 66 du 916 du 35%
0 du 0%
_:. ......___................................................................................................................................................................................................_____------------------ ---------------
36du 18 du 126 du 240 du 198 du 162 du 270 du 306 du 54 du 72 du 36 du 1,518 du 90%
-du 0%
75 du 75 du 25 du 175 du 10%
268 du 311 du 154 du 444 du 560 du 321 du 340 du 376 du 421 du 301 du 303 du 281 du 228 du 4,308 du
41.87 ac 45.06 ac 16.42 ac 51.60 ac 35.67 ac 20.64 ac 38.34 ac 16.17 ac 28.89 ac 33.88 ac 39.76 ac 50.69 ac 23.66 ac 30.00 ac 45.30 ac 517.95 ac
....................................................................................................................................................................................................................................:................................
7 du/ac 7 du/ae 10 du/ac 9 du/ac 16 du/ac 16 tlu/ac 9 du/ac 24 du/ac 15 du/ac 9 du/ac 8 du/ac 6 du/ac 10 tlu/m
11 du/ac 12 du/ac 16 du/ac 15 du/ac 27 du/ac 26 du/ac 15 du/ac 39 du/ac 25 du/ac 15 du/ac 13 du/ac 10 du/ac 17 du/ac PUD calculation method
Minimum per PUD
Estimated per PUD
Estimated Non-residential By Phase
Unit Type Phase Total
Name A B c D E F G H I J K L M N O Area
39,787 sf 43,980 sf 21,027 sf 104,794 sf
3,600 sf 11,052 sf - 10,995 sf 21,027 sf 11,160 sf 57,834 sf
.:_.._.................._.._.._.._.._............................................................................................................................................................................
...............................
.i 29,472 sf 29,320 sf 224,288 sf 210,000 sf 650,000 sf 1,143,080 sf
U s1 0 si 3,800 61 0 0 80,311 of _, 0 si 84,295 sf 266,342 sf 11,160 sf 210,000 0650,000 s 1,305,708 sf
Phase N and O Concept Layout
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Overall Program Distribution
Program Distribution
Program Size Notes
41.87 ac
45.06 ac
16A2 ac
51.60 ac
._-_-__35.67 ac________.
Phase E
20.64 ac
38.34 ac Phase calculations are approximate,
however they are reflected in the
16.17 ac PUD.Phase boundaries are
28.89 ac -generally drawn down road
--------------------------centerlines or greenway corridors.
33.88 ac
....:...::..............................::..:.._.
39.76 ac
_-._-._____..............--------_--------
50.69 ac
23.66 ac
30.00 ac
Phase 0
45.30 ac
517.95 ac
16.00 ac
108.00 ac Per agreement
124.00 ac
87.00 ac Agreement is between 80 and 100
189.00 ac Approximate
45.00 ac Approximate
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