Modeling of pump performance in a water pumping plant

Laajine, Fouad; Machkor, Mohammed; Mazouzi, Driss

doi:https://doi.org/10.5194/dwes-2021-16

Preprints

https://doi.org/10.5194/dwes-2021-16

Preprints

20 Jan 2022

| 20 Jan 2022

Status: this discussion paper is a preprint. It has been under review for the journal Drinking Water Engineering and Science (DWES). The manuscript was not accepted for further review after discussion.

Modeling of pump performance in a water pumping plant

Fouad Laajine, Mohammed Machkor, and Driss Mazouzi

Abstract. Energy use in drinking Water Supply System represents an important part of the global energy consumption across all sectors. This portion is expected to raise, due to the raising demand and the recourse to unconventional water resources. For the water utilities, most of their operating costs are related to energy consumptions, especially the consumption of pumping systems. The main objective of this study is to produce a model which reflects the real behaviour of a pumping system to help in taking decisions on which pump to use First and which one to replace in case of a limited renovation. In order to do so, Multiple Linear regression was adopted to model the ratio kWh/m³ produced depending on the input parameters. The final model describes in a good manner the phenomenon (R²= 0.91), so it can be a good estimator as the calculated ratio is close to the experimental one. The Novelty of this approach is to have a model which takes into account the real behaviour of the system whereas most of the studies focus on the pump scheduling problem.

Received: 04 Sep 2021 – Discussion started: 20 Jan 2022

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.

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Fouad Laajine, Mohammed Machkor, and Driss Mazouzi

Status: closed

RC1:
'Comment on dwes-2021-16', Anonymous Referee #1, 24 Jan 2022

I have my comments in the atached file.

Citation: https://doi.org/10.5194/dwes-2021-16-RC1
- AC1: 'Reply on RC1', Driss MAZOUZI, 15 Feb 2022
  
  Dear Dr. Grabowski,
  Please find enclosed the revised version for the manuscript entitled “Modeling of pump performance in a water pumping plant" (Manuscript ID: ID 626534) as well as the answers to the referees questions.
  
  We thank the reviewers for the valuable comments and their positive feedback. The revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  Looking forward to hearing from you.
  Sincerely,
  Dr D. MAZOUZI
  
  Review report “Modeling of pump performance in a water pumping plant” by Fouad Laajine, Mohammed Machkor and Diss Mazouzi
  General comments
  The manuscript describes the modelling of a drinking water pumping station using multiple linear regression to model the kWh/m3 ratio depending on the input parameters. It finishes with the technical interpretation of the outcome of the model.
  Although the approach is quite original, as it takes into account the real behaviour of the system, major revisions are required. There are many unclear sections in the manuscript, the Results and Discussion section is too concise, the English language has to be improved (the wording, many typo’s, inconsistent use of capital letters (e.g. Multiple Linear regression, Multiple linear regression)) and the Tables and Figures are not well explained in the manuscript. The manuscripts looks like a short report and not as a scientific manuscript as any reference to other scientific papers, with the same approach or alternative approaches, is missing. This should be included in the introduction and discussion sections. In the present form it cannot be accepted.
  
  Response: Thanks for your kind reminders.
  - We revised the title of our paper, new title: Multiple Linear Regression Analysis of Pumps Performance in Water Pumping Plants
  - We revised, introduction, all the sentences, new reference... of the paper who you find in attached a new paper with all correction asked
  
  Specific comments
  Abstract
  Line 15: what is meant by “real behaviour”?
  Line 16: First should be first
  Line 18: mention the input parameters
  Line 19: what is meant by “phenomenon”?
  Introduction
  In the introduction any reference to other scientific papers dealing with optimizing pumping stations is missing.
  Line 35: What is the current 2023 agenda?
  Line 40: pumps account for 805 to 90% of the energy consumption, this depends on many factors (surface water or ground water, transport differences, flat or mountain region, etc).
  
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript .
  
  Materials and Methods
  - Lines 61-62: nice figure, but how does this research fits in this figure? To which category is it connected?
  - line 86: tank RCMO? What does RCMO mean?
  - line 87: probably the capacity of the pump is 457 m3/h?
  - Lines 89-90, Figure 5: Are the ND of the suction line and the discharge line correct? They are not in line with the text I lines 79-82.
  - Lines 97-103: the parameters should be defined in more detail. It is a list of parameters, while in the model eight input parameters are used: I assume the last (HMGI) covers four pumps? Be precise.
  - Line 110: Y is the output variable.
  - Lines 117-118: Table 1 is not clear. Just include the objective (not “1”), the variables (not “8”, the responses (not “1”).
  - Line 119: Rephrase: Table 1 shows instead of The table above.
  - Lines 122-123, Table 2: mean and standard deviation over the 4-years period?
  - Line 123: Rephrase: Table 2 shows then mean and standard deviation
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript.
  
  Results and Discussion
  - there should be references to other studies (see also comment in the introduction). This is only a bullet-list of the main observations without any discussion. Please rewrite.
  - Line 135: what is P?
  - Line 138: What is Q?
  - Lines 150-155: I suppose that “ratio” is kWh/m3?
  - Line s156-157, Table 5: Table 5 is not clear, needs to be explained. Two situations, b and b*? not clear.
  - Line 166: Multiple linear regression has shown that….
  - line 167: Not clear, what is meant by “adjusted”?
  - lines 174-191: Technical interpretation is nice, but it only deals with this case. Compariosn should be made with other approaches described in literature. Only one comparison is made in line 187 (five data-mining approaches), but it is not discussed whether this comparison is allowed.
  - Lines 125-126, Figure 6: What does this figure shows? What is on the Y-axis? What do the markers * and # mean?
  - Line s128-129 Figure 7: This is a strange representation of a box plot. What is on the Y-axis? What do the p-values mean?
  
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript.
  
  Conclusions
  - They should be rewritten. It is now just one sentence what the study was about and a couple of recommendations. What can be concluded from the research? Does the approach work? Is it different from other approaches? Etc.
  
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript.
  
  Principle criteria
  Scientific significance: fair
  Scientific quality: poor
  Presentation quality: poor
  
  Response: Thank you very much for your previous comments that helped us improves this manuscript. The authors wish that the revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  
  Citation: https://doi.org/10.5194/dwes-2021-16-AC1
RC2:
'Comment on dwes-2021-16', Jan Peter van der Hoek, 16 Feb 2022

The authors have resubmitted the manuscript, but the revisions are not clear. Just an answer "we have made revisions accordingly" is not sufficient. Please submit the revised manuscript with Track Changes and submit a rebuttal which point by point a reaction on the comments of the reviewers.

Citation: https://doi.org/10.5194/dwes-2021-16-RC2
- AC2:
  'Reply on RC2', Driss MAZOUZI, 28 Feb 2022
  
  Dear Dr. Grabowski,
  Please find enclosed the revised version for the manuscript entitled “Modeling of pump performance in a water pumping plant" (Manuscript ID: ID 626534) as well as the answers to the referees questions.
  We thank the reviewers for the valuable comments and their positive feedback. The revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  Looking forward to hearing from you.
  Sincerely,
  Dr D. MAZOUZI
  Review report “Modeling of pump performance in a water pumping plant” by Fouad Laajine, Mohammed Machkor and Diss Mazouzi
  General comments
  The manuscript describes the modelling of a drinking water pumping station using multiple linear regression to model the kWh/m3 ratio depending on the input parameters. It finishes with the technical interpretation of the outcome of the model.
  Although the approach is quite original, as it takes into account the real behaviour of the system, major revisions are required. There are many unclear sections in the manuscript, the Results and Discussion section is too concise, the English language has to be improved (the wording, many typo’s, inconsistent use of capital letters (e.g. Multiple Linear regression, Multiple linear regression)) and the Tables and Figures are not well explained in the manuscript. The manuscripts looks like a short report and not as a scientific manuscript as any reference to other scientific papers, with the same approach or alternative approaches, is missing. This should be included in the introduction and discussion sections. In the present form it cannot be accepted.
  Response: Thanks for your kind reminders.
  - We revised the title of our paper, new title: Multiple Linear Regression Analysis of Pumps Performance in Water Pumping Plants.
  - We revised, introduction, all the sentences, new reference... of the paper who you find in attached a new paper with all correction asked.
  - We hope that the manuscript has been improved towards after this revision.
  Specific comments
  Abstract
  Line 15: what is meant by “real behaviour”?
  Response: By using real-time-data, we revised the sentence as follow: “In this context, the main objective of this study was to model accurately the energy consumption of pumping systems in order to optimize the whole water supply system, thus improving its efficiency, especially in the case of a limited renovation”
  Line 16: First should be first
  Response: We revised the sentence by new version
  Line 18: mention the input parameters
  Response: The new sentence as follow: “For this purpose, Multiple Linear Regression was fitted to model the produced kWh/m3 ratio according to the following parameters, active and reactive energies, the daily produced water volume, the power factor (Cosj), and the operating time of each pump”
  Line 19: what is meant by “phenomenon”?
  Response: By the consumption, the new sentence as follow: “The final model describes accurately the consumption per cubic meter produced (R²=0.91)”
  Introduction
  In the introduction any reference to other scientific papers dealing with optimizing pumping stations is missing.
  Response: Thanks for your nice reminder. We provided the following citations to support this statement.
  Adamowski, J., Fung Chan, H., Prasher, S. O., Ozga-Zielinski, B., Sliusarieva, A.: Comparison of multiple linear and nonlinear regression, autoregressive integrated moving average, artificial neural network, and wavelet artificial neural network methods for urban water demand forecasting in Montreal, Canada WATER RESOURCES RESEARCH, VOL. 48, W01528, doi:10.1029/2010WR009945, 2012.
  Kusiak, A., Zeng, Y., Zhang, Z. : Modeling and analysis of pumps in a wastewater treatment plant : A data-mining approach, Engineering Applications of Artificial Intelligence., 26, 7, 1643-1651, 2013.
  Shankar, A., Umashankar, V. K., Paramasivam, S., Norbert., S. H. : A comprehensive review on energy efficiency enhancement initiatives in centrifugal pumping system, Applied Energy, Elsevier, 181, C, 495-513, 2016
  Carravetta, A. ; Giugni, M. ; Malavasi, S. : Application of Innovative Technologies for Active Control and Energy Efficiency in Water Supply Systems. Water, 12, 3278. https://doi.org/10.3390/w12113278, 2020.
  Ostfeld, A. and Tubaltzev, A. : Ant Colony Optimization for Least Cost Design and Operation of Pumping and Operation of Pumping Water Distribution Systems. Journal of Water Resources Planning and Management, 134, 107-118. http://dx.doi.org/10.1061/(ASCE)0733-9496(2008)134:2(107), 2008.
  Puleo, V., Morley, M., Freni, G., Savić, D., Multi-stage linear programming optimization for pump scheduling Procedia Engineering, 70, 1378-1385, 2014.
  Plappally, A.K., Lienhard, J.H. V.: Energy requirements for water production, treatment, end use, reclamation, and disposal Renewable and Sustainable Energy Reviews 16, 4818–4848, 2012.
  Rothausen, S., Conway, D. Greenhouse-gas emissions from energy use in the water sector. Nature Clim Change 1, 210–219, https://doi.org/10.1038/nclimate1147, 2011.
  Wu, P., Lai, Z., Wu, D., Wang, L.: Optimization research of parallel pump system for improving energy efficiency, Journal of Water Resources Planning and Management, 141, 8, 2015.
  Zhou, Y., Lee, E. W. M., Wong, L. T., & Mui, K. W. : Environmental evaluation of pump replacement period in water supply systems of buildings. Journal of Building Engineering, 40, 102750, 2021.
  Line 35: What is the current 2023 agenda?
  Response: The new sentence as follow: To reach the sixth Sustainable Development Goal (SDG6) that aims to generalize the access to drinking water supply, the water production cost mustn't impact its price which should stay affordable to the population
  Line 40: pumps account for 805 to 90% of the energy consumption, this depends on many factors (surface water or ground water, transport differences, flat or mountain region, etc).
  Response: We provided an explanation in Subsection
  “Pumping processes consume the largest fraction of total energy (Plappally and Lienhard, 2012). The pumps consumption often presents 80% to 90% of the total energy consumption (Sarbu, 2016). However, this consumption may depend on many factors such as surface water or ground water, transport differences, flat or mountain regions, etc (Rothausen and Conway, 2011) (Plappally and Lienhard, 2012).”
  Materials and Methods
  - Lines 61-62: nice figure, but how does this research fits in this figure? To which category is it connected?
  Response: Thank you very much. We don’t think so. Figure 2 is a figure of system energy efficiency
  - line 86: tank RCMO? What does RCMO mean?
  Response: Tank RMC0 Þ tank destined to provide the water treatment plant with raw water, it is called RMC0 and having a capacity of 1000 m³
  - Lines 89-90, Figure 5: Are the ND of the suction line and the discharge line correct? They are not in line with the text I lines 79-82.
  Response: ND Þ nominal diameter
  - Lines 97-103: the parameters should be defined in more detail. It is a list of parameters, while in the model eight input parameters are used: I assume the last (HMGI) covers four pumps? Be precise.
  Response: HMG Þ HMG1: the pump operating time “1”,
  HMG2: the pump operating time “2”,
  HMG3: the pump operating time “3”,
  HMG4: the pump operating time “4”.
  - Line 110: Y is the output variable.
  Response: Thank you very much for the reminder, Y is the output variable
  - Lines 117-118: Table 1 is not clear. Just include the objective (not “1”), the variables (not “8”, the responses (not “1”).
  Response: Thank you very much for the reminder, we changed it as follows: “The effect of eight variables on the produced Kwh/m³ ratio was evaluated (Table 1). Of note, 1388 experiments were conducted during 4 years.”
  - Line 119: Rephrase: Table 1 shows instead of The table above.
  Response: Thank you very much for the reminder.
  - Lines 122-123, Table 2: mean and standard deviation over the 4-years period?
  Response: Thank you very much for the reminder. The mean and standard deviation during period 2015 and 2018
  - Line 123: Rephrase: Table 2 shows then mean and standard deviation
  Response: Thank you very much for the reminder. The mean and standard deviation during period 2015 and 2018
  Results and Discussion
  - there should be references to other studies (see also comment in the introduction). This is only a bullet-list of the main observations without any discussion. Please rewrite.
  Response: Thank you very much your comments. We have read your comments carefully and tried our best to address them one by one, especially in results and discussion section. We hope that the manuscript has been improved towards after this revision.
  - Line 135: what is P?
  Response: P is the active energy consumed by the pumping station (measured by a wattmeter)
  - Line 138: What is Q?
  Response: Q is the reactive energy consumed by the pumping station (measured by a wattmeter)
  - Lines 150-155: I suppose that “ratio” is kWh/m3?
  Response: yes, is electricity consumption by the pumps per m³ of water consumption
  - Line s156-157, Table 5: Table 5 is not clear, needs to be explained. Two situations, b and b*? not clear.
  Response: Thank you for your nice reminder. We revised most of the table 4 and 5 captions to make them clearer. (b*) is Standardized regression coefficient and (b) is regression coefficient
  - Line 166: Multiple linear regression has shown that….
  Response: Thank you very much for pointing this out. We revised the sentence as follows:
  “Besides that, R-square and Adjusted R-square statistic of this model was 0.91 were found and the value standard error estimate statistically significant at the level of 0.05, as shown in Table 6. In view of these results, we can say that the parameters studied are highly variable in the research area, thus, they also confirm the performance of the developed model.”
  - line 167: Not clear, what is meant by “adjusted”?
  Response: is Adjusted R-square
  - lines 174-191: Technical interpretation is nice, but it only deals with this case. Comparison should be made with other approaches described in literature. Only one comparison is made in line 187 (five data-mining approaches), but it is not discussed whether this comparison is allowed.
  Response: Thank you for your comments. We have gone through your comments carefully and tried our best to address them one by one. We hope the technical interpretation section has been improved accordingly.
  - Lines 125-126, Figure 6: What does this figure shows? What is on the Y-axis? What do the markers * and # mean?
  - Line s128-129 Figure 7: This is a strange representation of a box plot. What is on the Y-axis? What do the p-values mean?
  Response: Thank you for the nice reminder. We combined Figure 6 and 7 into one Figure 6 (A and B). The Y-axis is consumption of water (10³ m³). The markers * and # was (*: consumption variation through the years; #: consumption variation through the months)
  Conclusions
  - They should be rewritten. It is now just one sentence what the study was about and a couple of recommendations. What can be concluded from the research? Does the approach work? Is it different from other approaches? Etc.
  Response: Thank you very much for pointing this out. We revised the sentence of conclusions in new version manuscript:
  Principle criteria
  Scientific significance: fair
  Scientific quality: poor
  Presentation quality: poor
  Response: Thank you very much for your previous comments that helped us improves this manuscript. The authors wish that the revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  
  Citation: https://doi.org/10.5194/dwes-2021-16-AC2
  - RC3: 'Reply on AC2', Jan Peter van der Hoek, 03 Mar 2022
    
    Dear author,.
    Can you please send me the revised manuscript with Track Changes? I only received your rebuttal, see attchment.
    
    Kind regards, Jan Peter
    
    Citation: https://doi.org/10.5194/dwes-2021-16-RC3
    
    AC3: 'Reply on RC3', Driss MAZOUZI, 04 Mar 2022
    
    Dear Prof. Jan Peter van der Hoek,
    
    We greatly appreciate your time dealing with the manuscript and assessing the review comments, you will find attached a new version of the manuscript (attachment supplement). Otherwise, I can send it to your email address
    Sincerely,
    D Mazouzi
    
    Citation: https://doi.org/10.5194/dwes-2021-16-AC3
RC4:
'Comment on dwes-2021-16', Anonymous Referee #2, 16 Mar 2022

The paper presents an interesting case study, unfortunately summarized in a substandard publication without any tangible scientific contribution. Further comments to document this verdict are to be found in the attached file.

Citation: https://doi.org/10.5194/dwes-2021-16-RC4
- AC4: 'Reply on RC4', Driss MAZOUZI, 25 Mar 2022
  
  Dear reviewer,
  Thank you for your comments on our manuscript. Indeed, we found your comments very helpful.
  Here is an attached summary of our revisions in response to your criticisms.
  We hope you find these revisions acceptable.
  I can send me the revised manuscript with Track Changes
  Thank you for your kind consideration of our manuscript.
  Best regards
  
  Citation: https://doi.org/10.5194/dwes-2021-16-AC4

Status: closed

RC1:
'Comment on dwes-2021-16', Anonymous Referee #1, 24 Jan 2022

I have my comments in the atached file.

Citation: https://doi.org/10.5194/dwes-2021-16-RC1
- AC1: 'Reply on RC1', Driss MAZOUZI, 15 Feb 2022
  
  Dear Dr. Grabowski,
  Please find enclosed the revised version for the manuscript entitled “Modeling of pump performance in a water pumping plant" (Manuscript ID: ID 626534) as well as the answers to the referees questions.
  
  We thank the reviewers for the valuable comments and their positive feedback. The revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  Looking forward to hearing from you.
  Sincerely,
  Dr D. MAZOUZI
  
  Review report “Modeling of pump performance in a water pumping plant” by Fouad Laajine, Mohammed Machkor and Diss Mazouzi
  General comments
  The manuscript describes the modelling of a drinking water pumping station using multiple linear regression to model the kWh/m3 ratio depending on the input parameters. It finishes with the technical interpretation of the outcome of the model.
  Although the approach is quite original, as it takes into account the real behaviour of the system, major revisions are required. There are many unclear sections in the manuscript, the Results and Discussion section is too concise, the English language has to be improved (the wording, many typo’s, inconsistent use of capital letters (e.g. Multiple Linear regression, Multiple linear regression)) and the Tables and Figures are not well explained in the manuscript. The manuscripts looks like a short report and not as a scientific manuscript as any reference to other scientific papers, with the same approach or alternative approaches, is missing. This should be included in the introduction and discussion sections. In the present form it cannot be accepted.
  
  Response: Thanks for your kind reminders.
  - We revised the title of our paper, new title: Multiple Linear Regression Analysis of Pumps Performance in Water Pumping Plants
  - We revised, introduction, all the sentences, new reference... of the paper who you find in attached a new paper with all correction asked
  
  Specific comments
  Abstract
  Line 15: what is meant by “real behaviour”?
  Line 16: First should be first
  Line 18: mention the input parameters
  Line 19: what is meant by “phenomenon”?
  Introduction
  In the introduction any reference to other scientific papers dealing with optimizing pumping stations is missing.
  Line 35: What is the current 2023 agenda?
  Line 40: pumps account for 805 to 90% of the energy consumption, this depends on many factors (surface water or ground water, transport differences, flat or mountain region, etc).
  
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript .
  
  Materials and Methods
  - Lines 61-62: nice figure, but how does this research fits in this figure? To which category is it connected?
  - line 86: tank RCMO? What does RCMO mean?
  - line 87: probably the capacity of the pump is 457 m3/h?
  - Lines 89-90, Figure 5: Are the ND of the suction line and the discharge line correct? They are not in line with the text I lines 79-82.
  - Lines 97-103: the parameters should be defined in more detail. It is a list of parameters, while in the model eight input parameters are used: I assume the last (HMGI) covers four pumps? Be precise.
  - Line 110: Y is the output variable.
  - Lines 117-118: Table 1 is not clear. Just include the objective (not “1”), the variables (not “8”, the responses (not “1”).
  - Line 119: Rephrase: Table 1 shows instead of The table above.
  - Lines 122-123, Table 2: mean and standard deviation over the 4-years period?
  - Line 123: Rephrase: Table 2 shows then mean and standard deviation
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript.
  
  Results and Discussion
  - there should be references to other studies (see also comment in the introduction). This is only a bullet-list of the main observations without any discussion. Please rewrite.
  - Line 135: what is P?
  - Line 138: What is Q?
  - Lines 150-155: I suppose that “ratio” is kWh/m3?
  - Line s156-157, Table 5: Table 5 is not clear, needs to be explained. Two situations, b and b*? not clear.
  - Line 166: Multiple linear regression has shown that….
  - line 167: Not clear, what is meant by “adjusted”?
  - lines 174-191: Technical interpretation is nice, but it only deals with this case. Compariosn should be made with other approaches described in literature. Only one comparison is made in line 187 (five data-mining approaches), but it is not discussed whether this comparison is allowed.
  - Lines 125-126, Figure 6: What does this figure shows? What is on the Y-axis? What do the markers * and # mean?
  - Line s128-129 Figure 7: This is a strange representation of a box plot. What is on the Y-axis? What do the p-values mean?
  
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript.
  
  Conclusions
  - They should be rewritten. It is now just one sentence what the study was about and a couple of recommendations. What can be concluded from the research? Does the approach work? Is it different from other approaches? Etc.
  
  Response: Thank you very much for the reminder. We have made revisions accordingly in the new manuscript.
  
  Principle criteria
  Scientific significance: fair
  Scientific quality: poor
  Presentation quality: poor
  
  Response: Thank you very much for your previous comments that helped us improves this manuscript. The authors wish that the revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  
  Citation: https://doi.org/10.5194/dwes-2021-16-AC1
RC2:
'Comment on dwes-2021-16', Jan Peter van der Hoek, 16 Feb 2022

The authors have resubmitted the manuscript, but the revisions are not clear. Just an answer "we have made revisions accordingly" is not sufficient. Please submit the revised manuscript with Track Changes and submit a rebuttal which point by point a reaction on the comments of the reviewers.

Citation: https://doi.org/10.5194/dwes-2021-16-RC2
- AC2:
  'Reply on RC2', Driss MAZOUZI, 28 Feb 2022
  
  Dear Dr. Grabowski,
  Please find enclosed the revised version for the manuscript entitled “Modeling of pump performance in a water pumping plant" (Manuscript ID: ID 626534) as well as the answers to the referees questions.
  We thank the reviewers for the valuable comments and their positive feedback. The revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  Looking forward to hearing from you.
  Sincerely,
  Dr D. MAZOUZI
  Review report “Modeling of pump performance in a water pumping plant” by Fouad Laajine, Mohammed Machkor and Diss Mazouzi
  General comments
  The manuscript describes the modelling of a drinking water pumping station using multiple linear regression to model the kWh/m3 ratio depending on the input parameters. It finishes with the technical interpretation of the outcome of the model.
  Although the approach is quite original, as it takes into account the real behaviour of the system, major revisions are required. There are many unclear sections in the manuscript, the Results and Discussion section is too concise, the English language has to be improved (the wording, many typo’s, inconsistent use of capital letters (e.g. Multiple Linear regression, Multiple linear regression)) and the Tables and Figures are not well explained in the manuscript. The manuscripts looks like a short report and not as a scientific manuscript as any reference to other scientific papers, with the same approach or alternative approaches, is missing. This should be included in the introduction and discussion sections. In the present form it cannot be accepted.
  Response: Thanks for your kind reminders.
  - We revised the title of our paper, new title: Multiple Linear Regression Analysis of Pumps Performance in Water Pumping Plants.
  - We revised, introduction, all the sentences, new reference... of the paper who you find in attached a new paper with all correction asked.
  - We hope that the manuscript has been improved towards after this revision.
  Specific comments
  Abstract
  Line 15: what is meant by “real behaviour”?
  Response: By using real-time-data, we revised the sentence as follow: “In this context, the main objective of this study was to model accurately the energy consumption of pumping systems in order to optimize the whole water supply system, thus improving its efficiency, especially in the case of a limited renovation”
  Line 16: First should be first
  Response: We revised the sentence by new version
  Line 18: mention the input parameters
  Response: The new sentence as follow: “For this purpose, Multiple Linear Regression was fitted to model the produced kWh/m3 ratio according to the following parameters, active and reactive energies, the daily produced water volume, the power factor (Cosj), and the operating time of each pump”
  Line 19: what is meant by “phenomenon”?
  Response: By the consumption, the new sentence as follow: “The final model describes accurately the consumption per cubic meter produced (R²=0.91)”
  Introduction
  In the introduction any reference to other scientific papers dealing with optimizing pumping stations is missing.
  Response: Thanks for your nice reminder. We provided the following citations to support this statement.
  Adamowski, J., Fung Chan, H., Prasher, S. O., Ozga-Zielinski, B., Sliusarieva, A.: Comparison of multiple linear and nonlinear regression, autoregressive integrated moving average, artificial neural network, and wavelet artificial neural network methods for urban water demand forecasting in Montreal, Canada WATER RESOURCES RESEARCH, VOL. 48, W01528, doi:10.1029/2010WR009945, 2012.
  Kusiak, A., Zeng, Y., Zhang, Z. : Modeling and analysis of pumps in a wastewater treatment plant : A data-mining approach, Engineering Applications of Artificial Intelligence., 26, 7, 1643-1651, 2013.
  Shankar, A., Umashankar, V. K., Paramasivam, S., Norbert., S. H. : A comprehensive review on energy efficiency enhancement initiatives in centrifugal pumping system, Applied Energy, Elsevier, 181, C, 495-513, 2016
  Carravetta, A. ; Giugni, M. ; Malavasi, S. : Application of Innovative Technologies for Active Control and Energy Efficiency in Water Supply Systems. Water, 12, 3278. https://doi.org/10.3390/w12113278, 2020.
  Ostfeld, A. and Tubaltzev, A. : Ant Colony Optimization for Least Cost Design and Operation of Pumping and Operation of Pumping Water Distribution Systems. Journal of Water Resources Planning and Management, 134, 107-118. http://dx.doi.org/10.1061/(ASCE)0733-9496(2008)134:2(107), 2008.
  Puleo, V., Morley, M., Freni, G., Savić, D., Multi-stage linear programming optimization for pump scheduling Procedia Engineering, 70, 1378-1385, 2014.
  Plappally, A.K., Lienhard, J.H. V.: Energy requirements for water production, treatment, end use, reclamation, and disposal Renewable and Sustainable Energy Reviews 16, 4818–4848, 2012.
  Rothausen, S., Conway, D. Greenhouse-gas emissions from energy use in the water sector. Nature Clim Change 1, 210–219, https://doi.org/10.1038/nclimate1147, 2011.
  Wu, P., Lai, Z., Wu, D., Wang, L.: Optimization research of parallel pump system for improving energy efficiency, Journal of Water Resources Planning and Management, 141, 8, 2015.
  Zhou, Y., Lee, E. W. M., Wong, L. T., & Mui, K. W. : Environmental evaluation of pump replacement period in water supply systems of buildings. Journal of Building Engineering, 40, 102750, 2021.
  Line 35: What is the current 2023 agenda?
  Response: The new sentence as follow: To reach the sixth Sustainable Development Goal (SDG6) that aims to generalize the access to drinking water supply, the water production cost mustn't impact its price which should stay affordable to the population
  Line 40: pumps account for 805 to 90% of the energy consumption, this depends on many factors (surface water or ground water, transport differences, flat or mountain region, etc).
  Response: We provided an explanation in Subsection
  “Pumping processes consume the largest fraction of total energy (Plappally and Lienhard, 2012). The pumps consumption often presents 80% to 90% of the total energy consumption (Sarbu, 2016). However, this consumption may depend on many factors such as surface water or ground water, transport differences, flat or mountain regions, etc (Rothausen and Conway, 2011) (Plappally and Lienhard, 2012).”
  Materials and Methods
  - Lines 61-62: nice figure, but how does this research fits in this figure? To which category is it connected?
  Response: Thank you very much. We don’t think so. Figure 2 is a figure of system energy efficiency
  - line 86: tank RCMO? What does RCMO mean?
  Response: Tank RMC0 Þ tank destined to provide the water treatment plant with raw water, it is called RMC0 and having a capacity of 1000 m³
  - Lines 89-90, Figure 5: Are the ND of the suction line and the discharge line correct? They are not in line with the text I lines 79-82.
  Response: ND Þ nominal diameter
  - Lines 97-103: the parameters should be defined in more detail. It is a list of parameters, while in the model eight input parameters are used: I assume the last (HMGI) covers four pumps? Be precise.
  Response: HMG Þ HMG1: the pump operating time “1”,
  HMG2: the pump operating time “2”,
  HMG3: the pump operating time “3”,
  HMG4: the pump operating time “4”.
  - Line 110: Y is the output variable.
  Response: Thank you very much for the reminder, Y is the output variable
  - Lines 117-118: Table 1 is not clear. Just include the objective (not “1”), the variables (not “8”, the responses (not “1”).
  Response: Thank you very much for the reminder, we changed it as follows: “The effect of eight variables on the produced Kwh/m³ ratio was evaluated (Table 1). Of note, 1388 experiments were conducted during 4 years.”
  - Line 119: Rephrase: Table 1 shows instead of The table above.
  Response: Thank you very much for the reminder.
  - Lines 122-123, Table 2: mean and standard deviation over the 4-years period?
  Response: Thank you very much for the reminder. The mean and standard deviation during period 2015 and 2018
  - Line 123: Rephrase: Table 2 shows then mean and standard deviation
  Response: Thank you very much for the reminder. The mean and standard deviation during period 2015 and 2018
  Results and Discussion
  - there should be references to other studies (see also comment in the introduction). This is only a bullet-list of the main observations without any discussion. Please rewrite.
  Response: Thank you very much your comments. We have read your comments carefully and tried our best to address them one by one, especially in results and discussion section. We hope that the manuscript has been improved towards after this revision.
  - Line 135: what is P?
  Response: P is the active energy consumed by the pumping station (measured by a wattmeter)
  - Line 138: What is Q?
  Response: Q is the reactive energy consumed by the pumping station (measured by a wattmeter)
  - Lines 150-155: I suppose that “ratio” is kWh/m3?
  Response: yes, is electricity consumption by the pumps per m³ of water consumption
  - Line s156-157, Table 5: Table 5 is not clear, needs to be explained. Two situations, b and b*? not clear.
  Response: Thank you for your nice reminder. We revised most of the table 4 and 5 captions to make them clearer. (b*) is Standardized regression coefficient and (b) is regression coefficient
  - Line 166: Multiple linear regression has shown that….
  Response: Thank you very much for pointing this out. We revised the sentence as follows:
  “Besides that, R-square and Adjusted R-square statistic of this model was 0.91 were found and the value standard error estimate statistically significant at the level of 0.05, as shown in Table 6. In view of these results, we can say that the parameters studied are highly variable in the research area, thus, they also confirm the performance of the developed model.”
  - line 167: Not clear, what is meant by “adjusted”?
  Response: is Adjusted R-square
  - lines 174-191: Technical interpretation is nice, but it only deals with this case. Comparison should be made with other approaches described in literature. Only one comparison is made in line 187 (five data-mining approaches), but it is not discussed whether this comparison is allowed.
  Response: Thank you for your comments. We have gone through your comments carefully and tried our best to address them one by one. We hope the technical interpretation section has been improved accordingly.
  - Lines 125-126, Figure 6: What does this figure shows? What is on the Y-axis? What do the markers * and # mean?
  - Line s128-129 Figure 7: This is a strange representation of a box plot. What is on the Y-axis? What do the p-values mean?
  Response: Thank you for the nice reminder. We combined Figure 6 and 7 into one Figure 6 (A and B). The Y-axis is consumption of water (10³ m³). The markers * and # was (*: consumption variation through the years; #: consumption variation through the months)
  Conclusions
  - They should be rewritten. It is now just one sentence what the study was about and a couple of recommendations. What can be concluded from the research? Does the approach work? Is it different from other approaches? Etc.
  Response: Thank you very much for pointing this out. We revised the sentence of conclusions in new version manuscript:
  Principle criteria
  Scientific significance: fair
  Scientific quality: poor
  Presentation quality: poor
  Response: Thank you very much for your previous comments that helped us improves this manuscript. The authors wish that the revised version of the manuscript addresses the corrections suggested by the referees and clarifies the raised concerns.
  
  Citation: https://doi.org/10.5194/dwes-2021-16-AC2
  - RC3: 'Reply on AC2', Jan Peter van der Hoek, 03 Mar 2022
    
    Dear author,.
    Can you please send me the revised manuscript with Track Changes? I only received your rebuttal, see attchment.
    
    Kind regards, Jan Peter
    
    Citation: https://doi.org/10.5194/dwes-2021-16-RC3
    
    AC3: 'Reply on RC3', Driss MAZOUZI, 04 Mar 2022
    
    Dear Prof. Jan Peter van der Hoek,
    
    We greatly appreciate your time dealing with the manuscript and assessing the review comments, you will find attached a new version of the manuscript (attachment supplement). Otherwise, I can send it to your email address
    Sincerely,
    D Mazouzi
    
    Citation: https://doi.org/10.5194/dwes-2021-16-AC3
RC4:
'Comment on dwes-2021-16', Anonymous Referee #2, 16 Mar 2022

The paper presents an interesting case study, unfortunately summarized in a substandard publication without any tangible scientific contribution. Further comments to document this verdict are to be found in the attached file.

Citation: https://doi.org/10.5194/dwes-2021-16-RC4
- AC4: 'Reply on RC4', Driss MAZOUZI, 25 Mar 2022
  
  Dear reviewer,
  Thank you for your comments on our manuscript. Indeed, we found your comments very helpful.
  Here is an attached summary of our revisions in response to your criticisms.
  We hope you find these revisions acceptable.
  I can send me the revised manuscript with Track Changes
  Thank you for your kind consideration of our manuscript.
  Best regards
  
  Citation: https://doi.org/10.5194/dwes-2021-16-AC4

Fouad Laajine, Mohammed Machkor, and Driss Mazouzi

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