# CIV ENG 11 Chapter Notes - Chapter 4: Calcium Hydroxide, Sodium Hydroxide, Western United States

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Published on 11 Oct
School
Berkeley
Department
Civil And Environmental Engineering
Course
CIV ENG 11
Professor
1
DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
UNIVERSITY OF CALIFORNIA, BERKELEY
CE11 ENGINEERED SYSTEMS AND SUSTAINABILITY, SPRING 2020
HOMEWORK 6: WATER RESOURCES AND POLLUTION
DUE FRIDAY, APRIL 17, 2020 (TOTAL: 100 POINTS)
Water Footprint (32 points)
1. Use the Water Footprint Calculator to estimate your water footprint. Remember that this is a rough
estimate, but can provide some insight.
Water Footprint Calculator: http://waterfootprint.org/en/resources/interactive-tools/personal-water-
footprint-calculator/personal-calculator-extended
b. Estimate the total life-cycle energy associated with your water use (in kWh/year) assuming that
the energy intensity of water is 0.69 kWh/m3. (5 points)
c. Based on the total life-cycle energy of your water use, estimate the annual associated carbon
emissions. Assume that all energy use from water is in the form of electricity and that the
emission factor for electricity is 180gCO2eq/kWh. If your total annual carbon emissions is 16
metric tonnes of CO2eq, what percentage of the total can be attributed to your water usage? (8
points)
d. What are 3 practical ways to reduce your water footprint? (9 points)
References:
WaterFootprintNetwork (2019), Personal calculator – extended, http://waterfootprint.org/en/resources/interactive-tools/personal-
water-footprint-calculator/personal-calculator-extended, Accessed 3/29/2020 at 9:32 pm
Water Quality at EBMUD, Our Local Water Utility (31 points)
2. The East Bay Municipal Utility District (EBMUD) is the public agency responsible for providing
drinking water as well as collecting and treating wastewater for most of the East Bay.
The following questions require you to look up and read information from the EBMUD’s Water
Quality Report (https://www.ebmud.com/files/5315/2295/9210/EBMUD-AWQR-2017-web.pdf).
a. Based on the map, what reservoir(s) and treatment plant(s) does the water for Berkeley come
from? (6 points)
b. The large table contains information on the quality of the treated drinking water. What is the
difference between the PHG and the MCL? (6 points)
c. One of the public health concerns related to drinking water is from the formation of
trihalomethanes (THMs) formed in disinfection. What is the highest level of trihalomethanes
reported for any of the water treatment plants? At which plant was that level reported? How
does that level compare with the MCL (“maximum contaminant level”)? (6 points)
d. How many substances does EBMUD test for in our water? (3 points)
e. For what purpose does EBMUD add calcium hydroxide (Ca(OH)2) or sodium hydroxide
(NaOH) to the water? (4 points)
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## Document Summary

Due friday, april 17, 2020 (total: 100 points) Water footprint (32 points: use the water footprint calculator to estimate your water footprint. Remember that this is a rough estimate, but can provide some insight. Assume that all energy use from water is in the form of electricity and that the emission factor for electricity is 180gco2eq/kwh. If your total annual carbon emissions is 16 metric tonnes of co2eq, what percentage of the total can be attributed to your water usage? (8 points: what are 3 practical ways to reduce your water footprint? (9 points) Waterfootprintnetwork (2019), personal calculator extended, http://waterfootprint. org/en/resources/interactive-tools/personal- water-footprint-calculator/personal-calculator-extended, accessed 3/29/2020 at 9:32 pm. The following questions require you to look up and read information from the ebmud"s water. Quality report (https://www. ebmud. com/files/5315/2295/9210/ebmud-awqr-2017-web. pdf): based on the map, what reservoir(s) and treatment plant(s) does the water for berkeley come from? (6 points, the large table contains information on the quality of the treated drinking water.