IndWW-HW#1-FlowCalc-answers

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Georgia Institute Of Technology *

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Apr 3, 2024

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Your Name: 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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