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HomeMy WebLinkAbout016 Domestic Water Demand Calcs⚫ Page 1 2040 Harnish Boulevard, Billings, Montana 59101 406-245-0136 (phone), 406-245-2084 (fax) Memo To: Kylee Keller From: Aaron Sadowski Date: 8/17/2022 Re: 777 Boardwalk – Water Usage Calculation A.C.E. Job #5459 Kylee, Please see the following calculation summaries exhibiting the daily mean and maximum water usage calculations for the proposed building design. These figures are based on assumptions for fixtures to be installed in the building as well as the number of full-time employees and visitors occupying the building each day. A level of diversity is assumed based on LEED figures for fixture usages and durations based on fixture type and occupant type. The proposed building design is estimated to use 372 gallons of water on a model day with a maximum daily water usage of 446.4 gallons/day. Step 1. Step 2. IP units Step 3. No Step 4. Step 5. Assumptions Employees (FTE)Visitors Retail Customers Students (K-12)Residential 1.60 gpf 6.00 lpf n/a 1 0.1 0.1 1 5 1.60 gpf 6.00 lpf n/a 3 0.5 0.2 3 5 1.00 gpf 3.80 lpf n/a 2 0.4 0.1 2 0 0.50 gpm 1.90 lpm 30 3 0.5 0.2 3 0 2.20 gpm 8.30 lpm 60 0 0 0 0 5 2.20 gpm 8.30 lpm 15 1 0 0 0 0 2.20 gpm 8.30 lpm 60 0 0 0 0 4 2.50 gpm 9.50 lpm 300 0.1 0 0 0 0 2.50 gpm 9.50 lpm 480 0 0 0 0 1 V03 Copyright © 2012 U.S. Green Building Council All Rights Reserved Last Updated 09/01/2017 Enable macros. Indoor Water Use Reduction Calculator LEED v4 for D+C and O+M - WE Prerequisite/Credit Indoor Water Use Reduction LEED v4 for ND - GIB Prerequisite/Credit Indoor Water Use Reduction and GIB Credit Wastewater Management Note: This selection must match the unit of measurement chosen during project registration. Note: This calculator is for use with Excel for Mac 2011 and Excel 2007 or later. Note: Include in the prerequisite calculations all fixtures within the LEED project boundary. Include in the credit calculations all fixtures and fittings necessary to meet the needs of the occupants; some of these fittings and fixtures may be outside the tenant space (for Commercial Interiors) or project boundary (for New Construction). Upload a separate calculator for the credit as necessary. Note: Projects with extremely complex occupancy and/or fixture usage patterns (such as where different types of occupants have different annual days of operation and use fixtures with differing flush and flow rates within the building) may complete a separate calculator tab to represent the usage for complex scenarios. Complete the Flush and/or Flow tables on the Group tab. Unit of measurement The project is LEED for Neighborhood Development Note: This selection must match the rating system chosen during project registration. Private (residential) lavatory faucet Kitchen faucet Residential kitchen faucet Showerhead Upload the completed spreadsheet to LEED Online. Complete any related summary fields in the LEED credit form with the results of the calculator. Residential showerhead Public lavatory (restroom) faucet Default Uses per DayMaximum Installed Flush/Flow Rate IP SI Duration (sec)Fixture Type Toilet (male) Toilet (female) Urinal Project is not pursuing LEED award, calculator is being utilized for water usage calculations. 2 FTE + Visitors FTE + Visitors Table: Project Information Employees (FTE)Visitors Retail Customers Students (K-12)Residential Other (specify) Gender Ratio (%) Total 87 36 100 0 0 0 100% Male 44 18 50 0 0 0 50% Female 43 18 50 0 0 0 50% Percent of males expected to use restrooms with urinals 50% Enter the number of days the project is accessible to employees or FTE. Annual days of operation 300 For projects with dual-flush toilets Enter the resulting flush rate into the design case flush rate section below. Low flush (gpf) Full flush (gpf) LEED weighted average flush rate (gpf)0.00 Table: Flush Fixtures Fixture Information Flush Rate Uses per Day Total Daily Uses Total Daily Water Use Fixture ID Fixture Family Baseline Flush Rate (gpf) Design Flush Rate (gpf) Employees (FTE)Visitors Retail Customers Students (K-12)Residential Other Default Non-default (Optional) Baseline (gallons) Design (gallons) 0WC-1 Toilet (male)1.60 1.6 60 2.0 0.3 0.15 0.0 0.0 100.9 96.86 96.864 0WC-2 Toilet (female)1.60 1.6 40 3.0 0.5 0.20 0.0 0.0 148.0 94.72 94.72 0 0.0 0.0 0.00 0.0 0.0 0.0 0.00 0 0UR-1 Urinal 1.00 0.5 50 1.0 0.2 0.05 0.0 0.0 50.1 25.05 12.525 0 0.0 0.0 0.00 0.0 0.0 0.0 0.00 0 0.0 0.0 0.00 0.0 0.0 0.0 0.00 0 0.0 0.0 0.00 0.0 0.0 0.0 0.00 0 A Baseline case annual flush volume (gallons/year)64,989.00 Design case annual flush volume (gallons/year)61,232.70 Table: Flow Fixtures Fixture Information Duration Flow Rate Uses per Day Total Daily Uses Total Daily Water Use Fixture ID Default (sec) Non-default (sec) (Optional) Baseline Flow Rate (gpm) Design Flow Rate (gpm) Employees (FTE)Visitors Retail Customers Students (K-12)Residential Other Default Non-default (Optional) Baseline (gallons) Design (gallons) 1LAV-1 30 0.50 0.5 100 3.0 0.5 0.2 0.0 0.0 299.0 74.75 74.75 1SH-1 300 2.50 1.5 30 0.1 0.0 0.0 0.0 0.0 8.7 32.63 19.58 1S-1 15 2.20 1.5 100 1.0 0.0 0.0 0.0 0.0 87.0 47.85 32.63 1 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 1 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 B Baseline case annual flow volume (gallons/year)46,569.00 Design case annual flow volume (gallons/year)38,088.00 Group name Enter project occupancy information. This information should be consistent with occupancy numbers used in other LEED credits. Non-default gender mix The default gender mix is half male and half female. If necessary, modify the Male and Female occupant type columns for non-default gender mix if the project is specifically designed for an alternative gender ratio or the project is expected to have alternative gender usage rates for the life of the building. Occupancy Type Determine the percent of males expected to use urinals (enter 100% if all male restrooms have urinals, 0% if the project contains no urinals, etc) 1. Indicate the Fixture ID that matches the information provided in the plumbing schedule. 2. Select the Fixture Family and Fixture Type installed on the project. 3. Enter the Design Flush Rate identified by the manufacturer - for dual flush toilets, use the dual flush calculator to determine average flush rate. 4. Enter Percent of Occupants with access to the fixture. If the fixture is installed in all restrooms, use 100%. 5. If necessary, modify the Total Uses per Day column for non-default uses. Percent of Occupants (%)Fixture Type Low-Flow Water Closet Low-Flow Water Closet Kitchen faucet 1. Indicate the Fixture ID that matches the information provided in the plumbing schedule. 2. Select the Fixture Type installed on the project. 3. If necessary, modify the Duration column for non-default values.4. Enter the Design Flow Rate identified by the manufacturer. 5. Enter Percent of Occupants with access to the fixture. If the fixture is installed in all restrooms, use 100%. 6. If necessary, modify the Total Uses per Day column for non-default uses. Percent of Occupants (%)Fixture Type Public lavatory (restroom) faucet Showerhead Daily Flush Fixture Total = 204 Gal. Baseline = 217 Gal Daily Flow Fixture Total = 127 Gal. Baseline Flow Fixtures = 155 Gal. Daily Fixture Usage = 331 Gal. Baseline Fixture Usage = 372 Gal. Maximum Daily Water Usage Calculation Basis = 120% of baseline daily water usage (see page 5 for basis explanation) Maximum Daily Water Usage = 1.2 x 372 Gal. = 446.4 Gal/Day. 3 Summary for Design and Construction Rating SystemsNote: All information on this tab is READ-ONLY. To edit, see the previous tab(s). Annual Flush VolumeAnnual Flow VolumeAnnualConsumptionAnnual Flush VolumeAnnual Flow VolumeAnnual ConsumptionFTE + Visitors64,989.00 46,569.00 111,558.00 61,232.70 38,088.00 99,320.70AAnnual baseline water consumption (gallons/year)111,558.00Annual design water consumption (gallons/year)99,320.70Percent water use reduction (%)10.97%Baseline Case(gallons/year)Group Name(gallons/year)Design Case4 Summary for Operations and Maintenance Rating Systems Note: Baseline and design volumes are READ-ONLY. To edit, see the previous tab(s). Unrenovated percentage of fixtures installed before 1995 (%) Renovated percentage of fixtures installed in 1995 or later (%)100.00% Annual Flush Volume Annual Flow Volume Annual Consumption Annual Flush Volume Annual Flow Volume Annual Consumption FTE + Visitors 64,989.00 46,569.00 111,558.00 61,232.70 38,088.00 99,320.70 A Annual baseline water consumption (gallons/year)111,558.00 Annual design water consumption (gallons/year)99,320.70 Baseline multiplier (%)120.00% Water consumption maximum (gallons/year)133,869.60 Percentage below water consumption maximum (%)25.81% Group Name Baseline Case Design Case (gallons/year)(gallons/year) Mean Daily Water Usage: Based on 300 days occupation 99,320.7 gallons/year ------------------------------- = 331 gallons/day water usage. 300 days/year 5