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Prioritize Locations for Rehabilitation

Overview:

This tool evaluates all water points that are not producing water in a given district and evaluates how many people that currently lack access could be reached if the water point was repaired.

 

Illustrative Uses:

  • Determining which water points to rehabilitate

 

Instructions:

  1. Click "OK" on the welcome message
  2. Select "Repair Priority" from the tool selections at the top.
  3. In "Administrative Zone", type in the name of the district you are looking to identify rehabilitation priorities for. If there is not enough data in that district, the tool may give you an error.
  4. Select the access distance. This is the furthest people can be from a water point to be considered to have access. Note: WPDx recommends leaving the access distance at 1000m.
  5. Click "Execute"
  6. This tool may take 10-15 minutes to process. Note: This tool is not using significant amounts of data or bandwidth during this time. Instead, it is waiting for the server to complete the analysis.
  7. Once completed, a series of circles will appear on the map. The larger circles represent relatively more people that could be reached. Only water points where #status_id is "No" are shown.
  8. You can see the results on a satellite map by clicking the four squares in the top left of the map and selecting "Imagery with Labels". You can see the numerical definition of the circle size by clicking the button with the three lines.
  9. You can download the data by clicking the link under "Output CSV"
  10. In the CSV, the "Pop_Served" shows the number of additional people (not yet reached) that are estimated to be reached if that water point was rehabilitated.

 

Methodology:

This tool begins by importing the latest available data from WPDx for the given district. Next, it imports high resolution population maps of the district from ESRI's Living Atlas. This provides an estimate of the number of people living within every 250m x 250m grid square in the district. The tool then draws a circle around all functional water points with a radius equal to the access distance provided. The value of the population grid squares within the access circle are set to 0, as all of the people within the access distance of a functioning water point have service. A circle is then drawn around each non-functional water point with a radius equal to the access distance provided. The values of all of the population grid squares within the circle of each water point are added together, providing a total number of people not otherwise served for each non-functional water point.

 

Limitations:

This analysis is based on the latest available data, and population estimates from ESRI. Any water points that have been broken, rehabilitated, or constructed for which the data is not in WPDx have not been included in this analysis. Additionally, household connections are not captured in WPDx. As such, non-functional water points near large urban areas may be recommended for rehabilitation although people around it are served by household connections.

 

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