Standardized Water-Level Index (SWI)
Index name: Standardized Water-Level Index (SWI).
Ease of use: Yellow.
Origins: Developed by Bhuiyan at the Indian Institute of Technology, India, as a way to assess groundwater recharge deficits.
Characteristics: As a hydrology-based drought indicator, it uses data from wells to investigate the impact of drought on groundwater recharge. Results can be interpolated between points.
Input parameters: Groundwater well levels.
Applications: For areas with frequent seasonal low flows on main rivers and streams.
Strengths: The impact of drought on groundwater is a key component in agricultural and municipal water supplies.
Weaknesses: Only takes groundwater into account, and interpolation between points may not be representative of the region or climate regime.
References: Bhuiyan, C., 2004: Various Drought Indices for Monitoring Drought Condition in Aravalli Terrain of India. ISPRS Archives – Volume XXXV Part B7, 2004, XXth ISPRS Congress, Technical Commission VII, July 12-23, 2004, Istanbul, Turkey (O. Altan, ed.). International Society for Photogrammetry and Remote Sensing, 1283-1288.
15 Responses
Sir we can use this formula for surface water level of river . If no, please reply your answer sir
Dear Vikesh, Thanks a lot for your request. The SWI cannot be used to calculate river level but is based on groundwater level measured in wells. This is of course related to river levels in the are of the groundwater aquifer but no direct indication. River level is usually measured directly. Please let us know if you need further information.
Best regards,
IDMP Team
Hello . Is there software or program code to calculate the Gri index?
Thanks
Hi sir,this is ivan fro. Busitema university in uganda,pliz u clarify on how surface water supply index is computed?
Dear Ivan Fro
Detailed information on the calculation of the SWSI can be found in the following publication: https://www.droughtmanagement.info/literature/CSU_Development_SWSI_Western_United_States_1991.pdf.
You might also find the following presentation helpful: http://www.wamis.org/agm/meetings/hdi11/S3-Garen.pdf.
Best regards
IDMP team
Dear Chidambaram
Please see the extract below from the article on the SWI index website:
SWI has been developed to scale the ground water recharge deficit. The SWI expression stands as
SWI = (Wij −Wim)/σ
where Wij is the seasonal water level for the ith well and jth observation, Wim its seasonal mean, and σ is its standard deviation.
The SWI index webpage is https://www.droughtmanagement.info/standardized-water-level-index-swi/
And the Article can be found at:
https://www.droughtmanagement.info/literature/ISPRS_Various_Drought_Indices_Monitoring_Drought_Condition_Aravalli_Terrain_India_2004.pdf
You might also find the following case study interesting: https://www.preventionweb.net/files/65843_f214dhawalecrisismanagementtoriskma.pdf
Best regards,
IDMP Team
Sir iam a cs student , iam not able to understand how to calculate SWI can u please show a sample calculation with respective data set
I am a beginner in Hydrology. Can you please let me know the steps to use my groundwater level data to calculate SWI. Please explain SWI in basic level
mail me i will help you …
Hello . Is there software or program code to calculate the Gri index?
Thanks
Dear Hadi,
Please specify what is the GRI index? What does this stand for?
Best regards,
IDMP TSU
Dear Parimita Saikia,
Please refer to the SWI page: https://www.droughtmanagement.info/standardized-water-level-index-swi/
I would also recommend that you read the following reference:
https://www.droughtmanagement.info/literature/ISPRS_Various_Drought_Indices_Monitoring_Drought_Condition_Aravalli_Terrain_India_2004.pdf
Best regards,
IDMP Team
Thank you, sir.
Hello sir, this is Aarthi and i am a student of anna university,chennai , doing BE(geo-informatics). your reference article is very much helpful for my final year project idea. But , I have one doubt that ” How to calculate SWI? and which software is used to calculate SWI index?….. please , i request you to clarify my doubts. It’ll be very much helpful for me. please concern my request.
Dear Aarti,
Please see the extract below from the article on the SWI index website:
SWI has been developed to scale the ground water recharge deficit. The SWI expression stands as
SWI = (Wij −Wim)/σ
where Wij is the seasonal water level for the ith well and jth observation, Wim its seasonal mean, and σ is its standard deviation.
The SWI index webpage is https://www.droughtmanagement.info/standardized-water-level-index-swi/
And the Article can be found at:
https://www.droughtmanagement.info/literature/ISPRS_Various_Drought_Indices_Monitoring_Drought_Condition_Aravalli_Terrain_India_2004.pdf
IDMP Team