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| Ministry of Water q<0.0005 cumecs (DB) | Min. of Water Hydrological Year Book (Q=0.000 cumecs) | Ruaha Park Authority (days of ZF) | Remote Sensing | Corrected |
| 1990-1991 | 17 | | | | |
| 1991-1992 | 21 | | | | |
| 1992-1993 | 12 | | | | |
| 1993-1994 | 28 | | | | |
| 1994-1995 | 26 | | 28 | | |
| 1995-1996 | 73 | | 65 | | |
| 1996-1997 | 73 | | 60 | | |
| 1997-1998 | 66 | | 63 | | |
| 1998-1999 | Low Flow Missing | | 87 | | |
| 1999-2000 | No data | | 90 | | |
| 2000-2001 | 56 | | 66 | | |
| 2001-2002 | 38 | | 41 | | |
| 2002-2003 | 38 | | 52 | | |
| 2003-2004 | 63 | | 104 | | |
| 2004-2005 | 21 | | 31 | | |
| 2005-2006 | 46 | | 98 | | |
| 2006-2007 | 12 | | | | |
| 2007-2008 | 50 | | | | |
| 2008-2009 | 7 | | | | |
| 2009-2010 | 0 | | | | |
| 2010-2011 | 69 | 89 | 169 | | |
| 2011-2012 | 37 | 48 | 48 | | |
| 2012-2013 | 20 | 20 | 19 | | |
| 2013-2014 | 10 | 25 | 25 | | |
| 2014-2015 | 0 | 0 | | | |
| 2015-2016 | 0 | 0 | | 50 | |
| 2016-2017 | | 97 | 100 | 98 | |
| 2017-2018 | | 127 | | 103 | |
| 2018-2019 | | 12 | | 38 | |
| 2019-2020 | | 11 | | 13 | 12 |
| 2020-2021 | | | | 0 | |
| 2021-2022 | | | | 67 | |
| 2022-2023 | | | | 124 | |
| 2023-2024 | | | | 46 | |
| 2024-2025 | | | | 15 | |
| 2025-2026 | | | | 100 | |