IndWW-HW#1-FlowCalc-answers
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ANSWER KEY
IndWW HW#1 - Spring 2023
The below columns will auto-populate from the spreadsheets.
pts
In the spreadsheets, the yellow data is required. The light orange blocks are for showing work (and will be used for partial credit).
12
Q1
Water Meter Supply
6,194 gpd-cal
Pts: 3 work
8,613 gpd-cal
Pts: 3 subtract vol
7,357 gpd-cal
Pts: 3 convert units
7,688 gpd-cal
Pts: 3 divide days
12,464 gpd-cal
11,345 gpd-cal
10,034 gpd-cal
13,645 gpd-cal
13,393 gpd-cal
13,367 gpd-cal
15,656 gpd-cal
15,600 gpd-cal
3
Q2
Design Basis
14,332 gpd-cal (if quick avg Feb-June
14,358 exact Feb-June
15,628 gpd-cal (if quick avg May-Jun
15,629 exact May-June
3
Explanation/judgement:
5
Q3 Sanitary Flow
3,946 gpd-cal
Would accept 3,946 gpd-cal or roundings to 3,900 gpd-cal (sig figure) or 4,000 gpd-cal (eng judgement of design basis).
4
Q4
WCT1 Evap Loss/Drift
504 gpd-cal
4
WCT1 Blowdown
576 gpd-cal
4
WCT4 Evap Loss/Drift
161 gpd-cal
Evap
Sewer
Haul
5
Q5
Source 1 - Spray Station
66 gpd-cal
5
Source 2 - Parts Washer
154 gpd-cal
5
Source 3 - Dip Tank
30
9 gpd-cal
5
Source 4 - Scrubber
400
720 gpd-cal
30
Q6
Flow balance
6 - 2 each, outfalls totaled
5
Q7
Supply (upstream-metered)
13,694
Usage (dnstream-estimated)
15,902
Ratio: dnstream to upstrea
116%
5
Q8
Agree?
Decent agreement, but would prefer tighter control to within 10%.
What to adjust?
5
Q9
Meter agreement?
2
Q10A
Bonus/Gas Meter Read
238,800 CF
2
Q10B
Bonus/Gas Meter Read
2,388 CCF
2
Q10C
Bonus/Gas BTU
1,030 BTU/CF
2
Q10D
Bonus/Evap Hours
20.6 hrs/day
2
Q10E
Bonus/Evap Flow
1,298 gpd
110
Total
Because production is going up, neglect 2013 and 2012 data. Could justify Feb-Jun or May/Jun avg. Rounded: 14,500 to 16,000, w/matching explanation.
Submit on sheet Q6-Q9; also submit a pdf of the flow balance Q6-
Q9 sheet (fit to page)
Adjust the sanitary flow. The other sources do not account for sufficient amounts of flow to cover a 15,902-13,694 = 2,208 gpd difference, when considered individually.
Adjust sanitary from 25 to 20 gpd-person; decreases sanitary from 9,500 gpd to 7,600 gpd, or a 1,900 gpd difference. Balance would then be: 15902-1900=14002. Ratio 14002/13694 = 102%
Conclusion: you did a very good job on your field measurements. Your field measurements showed 4,414 gpd and the meter is showing 4,387 gpd. Dnstream to upstream: 4414/4387 = 101%
IndWW HW#1 - Spring 2023
Question #1 & 2
Scenario: Your field visit is in July 2014 and you are preparing a flow balance for use in a WWTP upgrade
because production has expanded. The following water meter data is available.
Question 1: First, complete the table below (calculate yellow columns: TGL and gpd-cal). You may use the wh
After reviewing the data in Question 1, answer Question 2 (see below this table).
(if you use Column F for related calcs; label the header)
4/16/12
31
3449
3641
192
192,000
6,194
5/17/12
31
3641
3908
267
267,000
8,613
6/14/12
28
3908
4114
206
206,000
7,357
7/16/12
32
4114
4360
246
246,000
7,688
3/19/13
28
6649
6998
349
349,000
12,464
4/17/13
29
6998
7327
329
329,000
11,345
5/16/13
29
7327
7618
291
291,000
10,034
2/18/14
31
788
1211
423
423,000
13,645
3/18/14
28
1211
1586
375
375,000
13,393
4/17/14
30
1586
1987
401
401,000
13,367
5/19/14
32
1987
2488
501
501,000
15,656
6/18/14
30
2488
2956
468
468,000
15,600
Question 2: For the scenario described at top of page, and based on the data above, determine an appropriate
Hint: Engineering judgement is required. Answer:
14,332 gpd-cal
If avg Feb-June month
15,628 gpd-cal
If avg May/June mont
Explain your judgement:
Because production is going up, neglect 2013 and 2012 data. Could justify Fe
Read Date
Elapsed Time (Days)
Prior Reading (TGL)
Current Reading (TGL)
Consumption (TGL)
Consump
tion (gal)
Water Usage (gpd-cal)
hite columns as needed for intermediate formulas.
e design basis. hly
14,358 If correct/adjust for meter dates, the avg Feb-June
thly
15,629 If correct/adjust for meter dates, the avg May-June
eb-Jun or May/Jun avg. Rounded: 14,500 to 16,000, w/matching explanation.
IndWW HW#1 - Spring 2023
Question #3
The HR department provides the following info:
* 175 employees, split into 100 on 1st, 50 on 2nd, and 25 on 3rd shift. The 1st shift works M-F, and half also work on Saturdays. 10% of 2nd shift also comes on Saturdays.
* In addition to employees, the plant relies on 25 temp workers on 1st shift and 10 temp workers on 2nd shi
What is a reasonable initial estimate of sanitary flow?
Show your steps below in peach box, and enter final answer in yellow box:
3,946 gpd-cal
M-F: 175 + 35 = 210 people
Saturday: 50 + 5 = 55 people
25 gpd (210 people x 5 d/wk) + 25 gpd (55 people x 1 d/wk)= 27,625 gal/wk
3,946 gpd-cal
ift, M-F
IndWW HW#1 - Spring 2023
Question #4
The site has two cooling towers. Here are your field notes.
WCT1
WCT1
WCT4
WCT1 Evaporative Loss/Drift: Cooling tower 1 (WCT1) is used to cool a furnace that runs 24 hr/day, 7 d/wk. Open loop side is filled by a float. You have been unable to get info on temperature and pump rates. Tested by turning off make-up/blowdown and leaving the recirc pump (tower spray overpack) running. The base of cooling tower is 41" x 30" W. The water level dropped 1.25" in 19 minutes, and then you turned the make-up/blowdown back on. What is the evaporative+drift loss (gpd) to use in your flow balance?
WCT1 Blowdown
: The cooling tower blowdown rotameter reads 0.4 gpm. What is the blowdown (gpd) to use in your flow balance?
WCT4 Evaporative Loss/Drift:
Cooling tower 4 (WCT4) is used to cool a furnace that runs M-F, 12 hr/day. When the furnace is not running, the cooling tower is turned off. You have limited time on-site and cannot directly measure, but the set-up (tower size, equipment) is the same as a tower WCT3 that operates 24 hr/d, 7 d/wk and was estimated at 450 gpd evaporative+drift loss. What is the WCT4 evaporative + drift loss (gpd-cal).
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