Namibia Reservoir Transparency

NamWater (Namibia Water Corporation) publishes a Weekly Dam Bulletin every Monday available as a free PDF download from the 'Quick Downloads' section of namwater.com.na. The bulletin reports current storage in Mm³ and percentage of full capacity for the 15 dams in the covered subset. National aggregate storage (currently ~1,567 Mm³ full supply capacity) is reported every week. The data is publicly accessible with no registration required, and is also disseminated via the NamWater X/Twitter account and republished by Namibia Economist, The Namibian and NBC News. Score is capped because the underlying data table is only available as a scanned/Excel-generated PDF with no structured data endpoint and because not every dam in the bulletin has a Mm³ figure — some show only percentage.

All data for the covered 15 dams is published exclusively as PDF documents (generated from Microsoft Excel, as confirmed by document metadata). There is no REST API, no CSV or JSON download, no interactive dashboard, and no open data portal. PDFs are freely downloadable without registration, which avoids the worst barrier, but programmatic ingestion requires non-trivial extraction from compressed PDF streams. NamWater's website has no linked API documentation and no machine-readable data format. No open data portal exists at data.gov.na or nsa.org.na for dam storage data. The SENSOTO platform covers only precipitation for Namibia, not reservoir storage.

Conservative estimate — denominator includes the long tail of ~7,900 small farm earth dams on ephemeral watercourses in arid commercial farming areas (individually small but cumulatively non-trivial in a country where every drop matters), municipal pondages, and private mining/industrial water storage that supplements NamWater's bulk-supply portfolio. Methodology v1.3.0 (capacity-weighted). Covered capacity through NamWater's Weekly Dam Bulletin is ~1,567 hm³ — every dam in the operationally significant bulk water supply portfolio. A realistic national denominator including the aggregate of farm and private dams reaches approximately 1,700 hm³. Score = round(100 × 1,567 / 1,700) = 92. The NamWater portfolio captures all strategic bulk-supply storage; the conservative discount reflects the long tail of small farm dams that, while individually below operational significance, aggregate to a non-trivial share in this driest sub-Saharan country.

Scoped to the covered subset, machine-readable historical depth is shallow and uneven. The oldest PDF bulletin confirmed available on namwater.com.na is from October 2022 (~4 years). The Namibia Economist archives carry weekly bulletins from at least early 2025 onwards; the Free Library has bulletins from 2024. Historical graphs in the Atlas of Namibia (atlasofnamibia.online) show dam volume fluctuations from 2003 to 2020 drawn from NamWater data (~18 years institutional, narrative-only), and NamWater's 2018/19 Annual Report is available online. The MAWF Hydrology Division holds longer records (some stations back to the 1960s) but these are not publicly downloadable. The median publicly accessible time-series depth across the 15 covered dams is approximately 10 years, dominated by the visible PDF archive and the third-party Atlas graphics.

NamWater publishes the Dam Bulletin for the covered 15 dams every Monday, making it a genuine weekly dataset — confirmed consistently across 2025 and 2026 reports. This is a strong cadence for sub-Saharan Africa and matches Spain's weekly MITECO bulletin. The NamWater X/Twitter account (@NamWater_na) pushes bullet-point summaries on the same day. No real-time or daily data is available: some bulletins note readings are 'estimated' (flag 'e') or missing ('NR') when conditions (wind, logistics) prevent measurement. The bulletin released on Monday reflects readings taken earlier in the week rather than a true end-of-week snapshot. Score is set below 70 because there is no sub-weekly or real-time data and occasional gaps appear in individual dam readings.

The bulletin itself contains only minimal notation: a legend indicating 'e' (estimated water level), 'w' (windy, inaccurate reading), 'NR' (no reading received), and 'N/A' (no rain gauge). No formal measurement methodology document is publicly available online for the 15 covered dams — NamWater's hydrological services page describes Namibia's hydrology in general terms but does not specify gauge types, stage-volume curve derivation, telemetry systems, or quality control procedures. A 2021 World Bank assessment of hydrometeorological services in Namibia recommended recalibration of stage-discharge relationships and updating of stage-capacity curves, implying methodology exists internally but is not published. The MAWF Hydrology Division produces a daily flood/drought bulletin using satellite precipitation (PDIR-Now) but does not publish dam measurement methodology. No ISO or WMO compliance statement is publicly available.

English is Namibia's sole official language since independence in 1990. All NamWater dam bulletins, press releases, website content, and social media posts are in English. There is no language barrier for international English-speaking researchers or the general public. The bulletin format is self-explanatory with standard column headers (dam name, storage volume, % full, catchment rainfall). One point deducted from a perfect score because some dam names (e.g. Dreihuk, Tilda Viljoen, Oanob) may require local geographic knowledge to locate, and there is no multilingual metadata or explanatory glossary for non-Namibian users.