Water Point Mapping (WPM) is a tool for monitoring the distribution and status of water supplies. It collects data about different aspects related to the water facility and overlays this point data with information about population and administrative boundaries. WPM helps to visualize the spatial distribution of water supply coverage and can thereby be used to highlight equity issues. The information collected provides insights into schemes' sustainability levels and management-related aspects of water points.
WPM can be used to (i) to inform the planning of investments to improve water supply coverage; (ii) to allocate resources to deliver basic services where they are most needed; (iii) to promote increased investments in the sector; and (iv) to measure progress and performance.
Relevance of mapping The Millennium Development Goals include a specific target (number 10 of Goal 7) to deal with people who do not access safe drinking water and basic sanitation. To adequately assess peoples' access to these basic services it is vital that there is accessible, accurate and reliable data that is routinely collected and updated.
A variety of tools and techniques have been developed in recent years to collect such information. However, unless data is easily accessible and is presented in a user-friendly format, decision makers commonly do without the information. One alternative that has been designed to manage large volumes of data and to enable a user-friendly presentation is to use geo-referenced datasets, which provide a means of integration of data from different sources at any point on the globe. Within such a framework, for any specific point on the map (identified by its grid reference) detailed and accurate data of different nature can be linked in an integrated way. Mapping therefore involves the presentation of certain information in a spatial context, and this enables policy planners to identify the geographic areas and communities in which to focus their efforts for maximum impact. In all, mapping presents many benefits, such as:
It makes easier to integrate data from different sources (surveys, censuses, satellites, etc.) and from different disciplines (social, economic, and environmental data). It also allows the switch to new units of analysis from, for example, administrative boundaries (e.g. state) to ecological boundaries (e.g. basin). Maps are a powerful visual tool and are more easily understood by stakeholders, particularly in developing countries. The spatial nature of water poverty, such as the distance to the nearest water source or the water supply infrastructure, can also be incorporated easily in a GIS database. The allocation of resources can be improved, since geographic targeting is more efficient and cost-effective than to launch an equally expensive universal distribution programme. Geo-referenced databases can be enriched by additional data as they become available; and new attributes, such as better details on water quality, can be incorporated into the data structure, ensuring that the relevance of the data is sustained over time. Maps can be produced at a number of different resolutions depending on their purpose and the cost of data collection. A coarse resolution or a scale too small neglects the heterogeneity within each unit and provides insufficient detail for decision making, while a fine resolution or a scale too large increases the cost of compiling, managing, and analyzing the data.
Methodology Water Point Mapping (WPM) can be defined as an 'exercise whereby the geographical positions of all improved water points in an area are gathered in addition to management, technical and demographical information'. A handheld Global Positioning System (GPS) unit is used to record the precise location and approximate altitude of all water points audited; a digital camera is used to capture photographs of each water point in order to show the status and physical conditions; and a structured questionnaire is completed to document main characteristics, such as: location, functionality, category of water supply, water quality perception, management issues, ownership and water tariff payment. All collected data is entered into a geographical information system and correlated with available demographic, administrative, and physical data. The information is finally displayed using digital maps.
WPM seeks to serve two different purposes:
To easily show the distribution of water points in a territory. This could enhance efficiency and transparency in local government's planning while enabling a higher degree of accountability towards population. To allow the definition of more reliable access indicators, which are to be constructed from the lowest geographical level with collected data.
The strength of water point maps is that they provide a clear message on who is and is not served; and particularly in rural areas, WPM can be used to highlight equity issues and schemes' functionality levels below the district level. In many developing countries, water sector ministries are undertaking reforms towards decentralization, transferring the responsibility of services management and resource allocation to local planners. This requires adequate performance monitoring frameworks backed up by accurate and reliable data at local level. WPM is increasingly thought of as a way to collect this information and display it through easy-to-use maps.
As a survey tool, WPM was originally designed and promoted by WaterAid in Malawi, although in recent years it has been carried out in different countries (Ethiopia, Ghana, Kenya, Malawi, Tanzania, Uganda, etc.) by a number of stakeholders (WaterAid, SNV, Ingeniería Sin Fronteras - ApD, Concern; etc.).
Improved and unimproved water points Main goal of WPM is to develop a comprehensive record of improved water points at a particular geographic area. The types of water points considered as improved are consistent with those accepted internationally by the Joint Monitoring Programme for Water Supply and Sanitation of WHO/UNICEF, where definition of improved is technology-based. More specifically, an improved water point is a place with some improved facilities where water is drawn for various uses such as drinking, washing and cooking.
+Definitions of "improved" and "unimproved" water points "Improved" "Unimproved"Piped water into dwelling, plot or yard Piped water into neighbour's plot Public tap/standpipe Tubewell / borehole Protected dug well Protected spring RainwaterUnprotected dug well Unprotected spring Small cart with tank/drum Tanker truck Surface water (river, dam, lake, etc.) Bottled water † † Considered as "not improved" because of concerns about the quantity of water supplied, not because of concerns over the water quality.
Water quality and seasonality issues Despite its growing importance, the issue of water quality has long been nearly absent from water coverage assessments, since few countries could afford regular water quality surveillance. Instead, it is assumed that certain types of water sources categorized as 'improved' are likely to deliver drinking water of adequate quality for basic health needs. This assumption appears over-optimistic, and improved technologies are shown not to be providing in all circumstances safe water. Similarly, health-related gains in water interventions are also dependent on service reliability; and it has been seen for example that annual health benefits attributed to the consumption of safe water are almost entirely lost if raw water is consumed over the course of few days. This draws attention to the issue of reliability and seasonality of drinking water sources.
Against this background, the Spanish NGO Ingeniería Sin Fronteras - Asociación para el Dessarrollo (ISF-ApD) complements the standard WPM campaign with two additional actions: (i) basic water quality tests are carried out using portable water testing kits (measuring pH, turbidity, chlorine, electrical conductivity and concentration of faecal coliforms); and (ii) the year-round functionality of water points is assessed by means of direct questions to users. The methodology used is ultimately designed to estimate the coverage of year-round safe improved water points of a certain territory.
Indicators for sector performance monitoring One drawback of water point maps is that they are only as accurate as the underlying data collected, so that there is a need to define reliable but simple indicators as the basis of the monitoring framework. Clearly, the core sector indicator is water supply coverage, and in rural areas, access to water is normally defined by establishing a ratio of the maximum distance and number of people served by each water point. Three different possibilities exist when defining access:
Calculate coverage as the standard number of people served per water point (normally defined in the water policy) multiplied by the number of water points, regardless of distance from dwellings to the water point. Calculate coverage by considering the people served by water point as the number of people living at a certain distance from it, regardless the maximum number of people to be served by a water point as defined in the corresponding water policy. A case-specific approach combining both of the above conditions and applying the most restrictive one in each scenario.
In order to accurately assess the number of people served using distance as a criterion (no. 2) the spatial distribution of population is required, and this is problematic in the majority of cases. Despite the progress made with satellite free access images, many rural areas are still not covered with sufficient precision. On the other hand, due to periodic sociological census undertaken in nearly all countries, population distribution in administrative structures is usually quite well documented. Thus, first above-mentioned criterion is the most commonly used.
With this information, the percentage of access to water in an area is estimated, and first indicator of access can be defined as Improved Community Water Point Density, which is equal to the number of Improved Community Water Points per 1,000 inhabitants. A certain area would have access if its density of water points per 1,000 inhabitants is above the national threshold, and percentage of people not served in an area would be proportional to the lack of water points available compared to that threshold. However, to further improve Improved Community Water Point indicators is simple since information on functionality for each water point is also collected during the survey. Non-functionality is an important obstacle to access to rural water supply, and in sub-Saharan Africa averages around 35%. Consequently, Functional Community Water Point Density can be used as more accurate access indicator. If water quality and seasonality issues are taken into consideration, other 'access' indicators can be defined, as shown in following Table.
+ List of indicators Indicator Calculation Improved community WP density Functional community WP density Year-round functional community WP density Bacteriological acceptable WP density Bacteriological acceptable and year-round functional WP densityNo. of improved community WPs per 1,000 inhabitants No. of functional Improved Community Water Points per 1,000 inhabitants No. of Improved Community Water Points working at least 11 months per year, per 1,000 inhabitants No. of functional Improved Community Water Points with an acceptable number of coliforms, per 1,000 inhabitants No. of Improved Community Water Points working at least 11 months per year and with an acceptable number of coliforms, per 1,000 inhabitants
Combining WPM data with household-based information In addition to safe water supplies, basic sanitation and hygiene also have significant impact on household health.