* Corresponding Author Email: olushola.oladosu@uniben.edu; Tel: +2348065211810 PRINT ISSN 1119-8362 Electronic ISSN 1119-8362 J. Appl. Sci. Environ. Manage. Vol. 26 (4) 695-700 April 2022 Full-text Available Online at https://www.ajol.info/index.php/jasem http://www.bioline.org.br/ja Evaluation of Height, Area, and Capacity of Concrete Elevated Water Reservoirs in a Tertiary Institution in Benin City, Nigeria * OLADOSU, SO; MUHAMMAD, TY Department of Geomatics, Faculty of Environmental Sciences, University of Benin, PMB 1154, Edo State, Nigeria * Corresponding Author Email: olushola.oladosu@uniben.edu; Tel: +2348065211810 Other Author Email: tijjani.muhammad@uniben.edu; Tel: +2348033357232 ABSTRACT: The objective of this work is to determine the height, area, and capacity of two concrete elevated water reservoirs in a Tertiary Institution in Benin City, Nigeria, to serve as reference to existing controls for future monitoring exercise. The two water reservoir involved in reality are of different shapes and sizes. The elevated heights, areas, and capacities of reservoir one and two suspended above their legs are: (8.106m, 362.778m 2 , 2940.680m 3 , and 7.485m, 320.400m 2 , 296.132m 3 ), respectively. The total heights of the reservoir one and two above ground level (AGL) are approximately 22m and 18m. Statistical analysis of uncertainty in height measurement showed, 0.0153 for reservoir one and 0.0412 for reservoir two. The provision of the necessary information by the REM method about the elevated water reservoirs showed its efficacy. This method is recommended for use in the measurement of inaccessible structure/feature. The type of data and information such as provided in this work are required for institutional water board documentation, water use planning, and archival purpose. DOI: https://dx.doi.org/10.4314/jasem.v26i4.19 Open Access Article: (https://pkp.sfu.ca/ojs/) This an open access article distributed under the Creative Commons Attribution License (CCL), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Impact factor: http://sjifactor.com/passport.php?id=21082 Google Analytics: https://www.ajol.info/stats/bdf07303d34706088ffffbc8a92c9c1491b12470 Copyright: © 2022 Oladosu and Muhammad Dates: Received: 16 February 2022; Revised: 13 April 2022; Accepted: 27 April 2022 Keywords: Elevated tank, Height, Area, Capacity, Total Station (REM) The importance attached to an overhead freshwater storage tank cannot be overemphasised. Such structures are common place within Benin City metropolis. Water and life are two inseparable entities; the latter depends highly on the former for survival. Consequently, life depends on water, as the body fluid is composed of about 70% water on average (CosanUSA, 2018; Frank, 2020). It is therefore imperative to maintain the balance. Sufficient and sustainable water distribution depends on the quality and durability of an elevated water tank in a particular geographic location (Woldeyesus, 2016). This fact necessitated the need for preservation and effective management of existing overhead tanks to meet the basic supply of potable water for drinking, domestic, agricultural, industrial, and various other purposes. How best to manage water resources have continued to be one of the challenges facing water resource engineers, environmental scientists, hydrologists, hydrographers, and decision-makers globally (Burton, 2019; Cosgrove and Loucks, 2015). Elevated concrete water tanks find their usefulness basically in water supply and fire protection and must be studied; for any deformation using stable controls as reference points Sameh et al., 2019; Falguni and Vanza, 2012; Koramutla and Sapatla, 2019; Corum, 2017; Hart and Udeh, 2020). An elevated concrete water tank is a large water storage container constructed to hold water supply at certain height in order to provide sufficient pressure for effective water distribution within the networks system. (Gareane et, al., 2011; Koramutla and Sapatla, 2019). According to Koramutla and Sapatla (2019), the basic classifications of elevated water tanks are into three categories viz: those storage water tanks constructed to rest on the ground, those situated under the ground, and the elevated ones, suspended at some altitude (height) above the ground level. Classification can also be on the constructed tank shape such as (circular, rectangular, cylindrical, pyramidal, triangular, etc.) which are the most common. Elevated water storage tanks (reservoirs) structures are supported on staging consisting of