Botswana Reservoir Transparency

WUC publishes current percentage-full levels for all nine major supply dams (Gaborone, Dikgatlhong, Letsibogo, Shashe, Bokaa, Nnywane, Ntimbale, Thune, Lotsane) on its website and via Facebook posts verified as recently as October 2025. The Government of Botswana Daily News also carries regular WUC press releases with dam-by-dam figures. However, the WUC website is heavily JavaScript-rendered and the dam-levels page returns minimal content to automated crawlers, making programmatic access unreliable. The DWA website (water.gov.bw) has an expired TLS certificate as of research date, rendering its Hydrological Situation Report PDF inaccessible. Data is therefore technically public but practically fragile.

No REST API or structured data feed exists for the 9 covered Botswana dams. The WUC website appears to render data via JavaScript, making the dam-levels page inaccessible to standard HTTP clients — automated fetching returns only the site acronym 'WUC' with no data content. No CSV, Excel, or JSON downloads are offered. The DWA hydrological reports are PDFs that are also currently unreachable due to an expired SSL certificate on water.gov.bw. The Open Data for Africa portal had a Botswana dams dataset but it dates to 2015 and returns HTTP 403 errors. Statistics Botswana publishes periodic water digest PDFs but they are binary-encoded and do not expose a machine-readable data layer. No registration barrier was identified, but the absence of any structured, downloadable format severely limits technical accessibility.

Linear coverage = round(100 × 9 / 9) = 100. WUC reports levels for all 9 reservoirs above 10 hm³ — Gaborone, Dikgatlhong (400 hm³), Letsibogo, Shashe, Bokaa, Nnywane, Ntimbale, Thune and Lotsane — which collectively account for essentially 100% of Botswana's managed surface-water storage used for municipal supply (combined design capacity approximately 903,000 Ml). The roughly 100 small agricultural dams managed by the Ministry of Agriculture are all below the 10 hm³ threshold and are not part of the denominator. Important caveat: effective storage capacity in WUC publications is materially overstated — official figures use original design capacities rather than current siltation-adjusted volumes, a problem highlighted by investigative reporting in The Gazette. Some readings (e.g. Lotsane) appear inconsistent across releases. These are quality issues; full inventory coverage is preserved.

Scoped to the 9 covered dams, machine-readable historical series are effectively absent. Statistics Botswana publishes biannual Water & Climate Digest PDFs containing dam-level tables dating back to at least 2014 (~12 years), and the UN Statistics Division hosts several of these (2014, 2017, 2020, 2022 editions). However, these are binary-encoded PDFs — not machine-readable tables — and cover annual or semi-annual snapshots rather than continuous time series. The Open Data for Africa portal hosted a 2015-vintage dataset with monthly percentage levels for individual dams (~11 years if accessible) but now returns HTTP 403 errors. Water accounts going back to 1992–2003 exist as UN archive PDFs but are inaccessible in machine-readable form. SASSCAL holds stream-flow records for 1982–2001 (~20 years) for flow not storage. Median historical depth across the 9 covered dams is approximately 12 years. No publicly available API or downloadable CSV with multi-year daily or weekly dam levels was found.

Evidence from a 2007 Mmegi article explicitly references 'WUC's update on the water availability situation between August 28 and September 4,' indicating a weekly reporting cadence at that time. WUC's Facebook page shows a post dated October 27, 2025, confirming ongoing regular publication for all 9 covered dams. Government Daily News articles from January 2025 and February 2025 each cite current WUC figures, and a July 2024 article quotes the WUC CEO with dam-by-dam percentages, suggesting quarterly or more frequent media releases. The website dam-levels page appears to be updated with current figures, though the exact lag between measurement and publication is not documented. Score is limited because update cadence is not formally committed to in any published SLA, the DWA hydrological portal is currently offline, and no real-time sensor feed or sub-weekly data layer exists.

No publicly accessible document describes how WUC measures and calculates dam storage percentages for the 9 covered dams — specifically what surveyed capacity figure is used as the denominator, how water levels are gauged, how rating curves are derived, or how frequently instruments are calibrated. The DWA has published an IWRM plan and a Water Accounting Report, and a hydrological situation report PDF exists on water.gov.bw, but the TLS certificate on that server is expired and the documents are inaccessible as of the research date. Academic literature (Springer 2021 chapter on Botswana dams) and investigative journalism (The Gazette) have noted that official capacity figures are based on original design specifications and do not account for decades of siltation, raising serious questions about the validity of the percentages published. A 2013 DWA study reportedly found that safe yields of reservoirs were unknown and storage was not being properly monitored. The OKACOM Protocol on Hydrological Data Sharing exists for the Okavango basin but focuses on flow data for riparian states rather than public reservoir transparency.

English is one of Botswana's two official languages (alongside Setswana) and is the language of government, law, and public administration. All WUC communications, press releases, government Daily News articles, DWA reports, and Statistics Botswana publications encountered during research are in English. The WUC website, Facebook page, and X/Twitter account all publish in English. No language barrier exists for English-speaking international users. A small deduction is applied because some community-level water data may be communicated only in Setswana locally, and the Statistics Botswana data portal interface has limited metadata in non-English languages.