Modification of Tennant and Wetted Perimeter Methods in Simindasht Basin, Tehran Province

Document Type : Research Papers


1 Tarbiat Modares Univesity

2 Tarbiat Modares University


Environmental Flow Requirement (EFR) is defined as the flow that is necessary to ensure the existence of habitats in water resources systems. EFR is defined in rivers as flow index commonly. Tennant method is the most popular hydrological method in rivers and based on the historic flow data. The most common method of hydraulic rating method is the wetted perimeter method. Habitat simulation techniques attempt to assess environmental flow requirements on the basis of detailed analyses of the suitability of instream physical habitat. Investigation of the relationship between simple approaches and physical habitat simulation approach and presentation of new recommendations based on the hydraulic and hydrological data can be very useful in estimation of environmental flow in planning phase of river projects. Main objective of present research are modification of Tennant and wetted perimeter methods and providing more reliable recommendations in Simindasht basin in Tehran province which Rainbow Trout is dominant species. Based on the results, in April to September 60% of mean annual flow (MAF) and in October to March 120% of MAF can provide sustainable habitats approximately. Also common wetted perimeter method estimates EFR more than real instream flow need of target species. This method will assess the suitable value for environmental flow on 86% of the maximum wetted perimeter approximately. But based on Physical habitat analysis mean suitable environmental flow will be assess in 63% of the maximum wetted perimeter. Hence modification of wetted perimeter based on physical habitat analysis can reduce instream flow need significantly.


Main Subjects

Abdoli, A. and Naderi, M. (2009). Biodiversity of fishes of the southern basin of the Caspian sea, Abzian Scientific Publication, Tehran.
Ahmadi-Nedushan, B., Hilaire, A., Berube, M., Ouarda, T.B.M.J. and Robichaud, E. (2008). "Instream flow determination using a multiple input fuzzy‐based rule system: A case study", River Research and Applications, 24(3), 279-292.
Ardani, S. and Soltanpour, M. (2015). "Modelling of sediment transport in Beris fishery port", Civil Engineering Infrastructures Journal, 48(1), 69-82.
Bockelmann, B.N., Fenrich, E.K., Lin, B. and Falconer, R.A. (2004). "Development of an ecohydraulics model for stream and river restoration", Ecological Engineering, 22(4), 227-235.
Bradford, M.J., Higgins, P.S., Korman, J. and Sneep, J. (2011). "Test of an environmental flow release in a British Columbia river: does more water mean more fish?", Freshwater Biology, 56(10), 2119-2134.
Caissie, D. and El-Jabi, N. (1995). "Comparison and regionalization of hydrologically based instream flow techniques in Atlantic Canada", Canadian Journal of Civil Engineering, 22(2), 235-246.
Coad,  B.W.  (2013). “Coad freshwater fishes of Iran”,
Gippel, C.J. and Stewardson, M.J. (1998). "Use of wetted perimeter in defining minimum environmental flows", Regulated Rivers: Research and Management, 14(1), 53-67.
Godinho, F., Costa, S., Pinheiro, P., Reis, F., and Pinheiro, A. (2014). "Integrated procedure for environmental flow assessment in rivers", Environmental Processes, 1(2), 137-147.
Karakoyun, Y., Yumurtaci, Z. and Dönmez, A.H. (2016). "Environmental flow assessment for energy generation sustainability employing different hydraulic evaluation methods: Çambaşi hydropower plant case study in Turkey", Clean Technologies and Environmental Policy, 18(2), 583-591.
Karimi, S.S., Yasi, M. and Eslamian, S. (2012). "Use of hydrological methods for assessment of environmental flow in a river reach", International Journal of Environmental Science and Technology, 9(3), 549-558.
Kennard, M.J., Pusey, B.J., Olden, J.D., MacKay, S.J., Stein, J.L. and Marsh, N. (2010). "Classification of natural flow regimes in Australia to support environmental flow management", Freshwater Biology, 55(1), 171-193.
Keshtkar, A.R., Salajegheh, A., Sadoddin, A. and Allan, M.G. (2013). "Application of Bayesian networks for sustainability assessment in catchment modeling and management (Case study: The Hablehrood river catchment)", Ecological Modelling, 268, 48-54.
Liu, J., Liu, Q. and Yang, H. (2016). "Assessing water scarcity by simultaneously considering environmental flow requirements, water quantity, and water quality", Ecological Indicators, 60, 434-441.
Mann, J.L. (2006). "Instream flow methodologies: An evaluation of the Tennant method for higher gradient streams in the national forest system lands in the western US", M.Sc. Thesis, Colorado State University, Fort Collins.
Martínez, F., García-López, L. and Beyer, M. (2017). "Integrating hydrological modelling and ecosystem functioning for environmental flows in climate change scenarios in the Zambezi river, Namibia", River Research and Applications, 33(2), 258-275.
Nourmohammadi Dehbalaei, F., Javan, M., Eghbalzaeh, A., Eftekhari, M. and Fatemi, S.E. (2016). "Assessment of Ilam reservoir eutrophication response in controlling water inflow", Civil Engineering Infrastructures Journal, 49(2), 215-234
Shokoohi, A. and Amini, M. (2014). "Introducing a new method to determine rivers’ ecological water requirement in comparison with hydrological and hydraulic methods", International Journal of Environmental Science and Technology, 11(3), 747-756.
Stalnaker, C.B. and Arnette, J.L. (1976). "Methodologies for determining instream flows for fish and other aquatic life, Methodologies for the determination of stream resource flow requirements", Report FWS/OBS-76-03. US Fish and Wildlife Service, Washington, DC, 89-138.
Wang, J., Dong, Z., Liao, W., Li, C., Feng, S., Luo, H. and Peng, Q. (2013). "An environmental flow assessment method based on the relationships between flow and ecological response: A case study of the Three Gorges Reservoir and its downstream reach", Science China Technological Sciences, 56(6), 1471-1484.
Zhang, Y., Arthington, A.H., Bunn, S.E., Mackay, S., Xia, J. and Kennard, M. (2012). "Classification of flow regimes for environmental flow assessment in regulated rivers: the Huai river basin, China", River Research and Applications, 28(7), 989-1005.
Volume 50, Issue 2
December 2017
Pages 221-231
  • Receive Date: 16 June 2016
  • Revise Date: 13 June 2017
  • Accept Date: 30 June 2017
  • First Publish Date: 01 December 2017