HomeMy WebLinkAboutSP-22-024 - Supplemental - 0430 da Vinci Drive (4)FAIRFIELD INN BY MARRIOTT AT BTV AIRPORT
Wastewater Design Flow Report
MAY 3, 2022
v:\1953\active\195311636\transportation\permits\wastewater\wastewater design flow report 05-03-2022.docx 1.1
1.0 Wastewater Project Description
The proposed hotel project at the Burlington International Airport (BTV) includes the
construction of a new, five story building. The proposed building will include 119 hotel
rooms with each room having a private bath. One meal will be served only to guests
and there will be a bar with 8 seats. It is estimated that 10 full time employees will be
required per each of the three daily shifts. There will be one bathroom with shower and
kitchenette for employee use only. Lastly, two clothes washing machines are proposed
for on-site laundry services.
The proposed building will be located along Airport Circle adjacent to Airport Drive at
the exit to Burlington International Airport in South Burlington, Vermont. Discharge of
wastewater from the proposed building will be to the South Burlington municipal
sanitary sewer collection system. The proposed BTV hotel will have an estimated average daily wastewater flow of 14,890 gpd. Average daily wastewater flow for the
proposed building was calculated based on the number of hotel rooms with one meal
per guest, 8 seats at the bar, employees working in the building, and additional clothes
washing machines for on-site laundry services. See below for calculations.
Conveyance of wastewater flows from the west side of the proposed building are to be
via a new 8” SDR 35 PVC gravity sanitary sewer pipe and a proposed sewer manhole.
The new 8” SDR 35 PVC building sewer will be installed at a slope of 0.0208 ft/ft and a
length of 81’. Connection into the existing 18” AC sewer main will be at an existing
sewer manhole located in the middle of Airport Drive.
1.1 WASTEWATER DESIGN FLOW ASSUMPTIONS
Design Assumptions:
1. Proposed Design includes:
a. 119 Hotel Rooms with private baths
b. One meal served only to guests per sleeping space including a breakfast
bar.
• 119 rooms with 2 people per room
c. A bar serving alcoholic beverages with 8 seats.
d. 10 full time employees/shift with access to a shower facility and 1 small
kitchenette for employee use only
e. 2 clothes washing machines for on-site laundry services
FAIRFIELD INN BY MARRIOTT AT BTV AIRPORT
Wastewater Design Flow Report
MAY 3, 2022
v:\1953\active\195311636\transportation\permits\wastewater\wastewater design flow report 05-03-2022.docx 1.2
1.2 WASTEWATER DESIGN FLOW CALCULATIONS
1. Base Design Average Daily Flow (ADF)
a. ADF = 119 hotel rooms x 2 guests x 50 gpd/room (assumes 2 persons/room)
ADF = 11,900 gpd
b. ADF = 119 hotel rooms x 2 guests x 5 gpd/sleeping space w/ meal x 1 meal
ADF = 1,190 gpd
c. ADF = 300 gpd (bar with 8 seats)
Note: design flows for the bar with 8 seats is considered to be equivalent
to a restaurant with 9 or fewer seats (ref. Restaurants in Table 8-3)
d. ADF = 10 employees with shower/shift x 20 gpd/employee/shift x 3 shifts =
600 gpd
Note: design flows for the employee kitchenette are considered by the
water use of employees (ref. * at the end of Table 8-3)
e. ADF = 2 clothes washing machines x 450 gpd/machine = 900 gpd
Therefore, Base Average Daily Flow = 14,890 gpd
2. Total Wastewater Allocation Required = 14,890 gpd
1.3 PEAK DAILY AND HOURLY FLOW
1. For flows > 10,000 gpd and < 100,000 gpd, the Peaking Factor = 4.2
2. Peak Daily Flow = 14,890 gpd x (Peaking Factor = 4.2) = 62,538 gpd
3. Peak Hourly Flow = 62,538 gpd / 1,440 minutes/day = 43.4 gpm
4. Average Daily Flow = 14,890 gpd / 1,440 minutes/day = 10.3 gpm
5. Building Sewer Pipe: 8” SDR 35 PVC at Slope = 0.0208 ft/ft
6. Pipe Velocity Review
• Velocity at Pipe Full = 6.49 ft/s > 2.0 ft/s, Q = 1,017 gpm, Therefore OK
• Velocity at Peak Hourly Flow = 3.22 ft/s, Q = 43.1 gpm
• Velocity at Average Daily Flow = 2.09 ft/s, Q = 10.3 gpm