\documentclass[english,german]{scrartcl}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\geometry{verbose,a4paper,tmargin=1.75cm,bmargin=2cm,lmargin=2cm,rmargin=2cm,headheight=0.8cm,headsep=0.5cm,footskip=0.5cm}
\usepackage{babel}
\usepackage{url}
\urlstyle{same}
\newcommand\email{\begingroup \urlstyle{same}\Url}\usepackage{graphicx}
\usepackage{units}
\usepackage{tabularx}
\usepackage{wasysym} % enable use of \permil instead of \textperthousand
\usepackage{marvosym}
\usepackage{arabtex}
\usepackage{hyphenat}
\usepackage{booktabs}
\usepackage{mdwlist}
\renewcommand{\thefootnote}{\relax}
\usepackage{index}
\newindex{key}{kdx}{knd}{Keywords}
\newindex{author}{idx}{ind}{Authors}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyfoot{}
\usepackage{ifpdf}
\ifpdf
%\usepackage[activate]{pdfcprot}
%\usepackage[owner=Tapioka, print=true, copy=true, edit=false, annotate=false,set]{pdfcrypt}
%encryption: not supported any more (since pdftex 1.10)
\usepackage[pdftex]{thumbpdf}
\usepackage[pdftex]{hyperref}
\hypersetup{pdftitle={Ecohydrology Study of Kirumi Wetland Using Hydroinformatics Tools},pdfauthor={Florence Mahay, Ann Van Griensven},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Ecohydrology, Hydroinformatics tools, Wetland},pdfpagemode=None,colorlinks=true}
\else
\usepackage{ae}
\usepackage{textcomp}
\fi
\begin{document}
\ifpdf
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2010.jpg}}}
\else
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2010.eps}}}
\fi
\hfill
\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
\hspace{0.1cm}
\begin{center}
\Large{\textbf{Ecohydrology Study of Kirumi Wetland Using Hydroinformatics Tools\footnote{\textbf{Contact Address:} Florence Mahay, Wami Ruvu Basin Water Office, Morogoro, Water Resources Monitoring and Assessment, Mazimbu Road, Morogoro, Tanzania, \mbox{e-mail}: \email{kajilu@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Florence Mahay$^{1}$, Ann Van Griensven$^{2}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$Wami Ruvu Basin Water Office, Morogoro, Water Resources Monitoring and Assessment, Tanzania}}}
\item[]{\small{\textit{$^{2}$Unesco Ihe, Hydroinformatics, }}}
\end{itemize*}
\index[author]{Mahay, Florence}
\index[author]{Van Griensven, Ann}
\begin{center}
\vspace{1.1cm}
\textbf{Abstract}
\begin{abstract}
\normalsize{
Hydroinformatics tools were used to set environmental water requirements for Kirumi wetland in Mara River catchment shared by Kenya and Tanzania. Mara River flows into lake Victoria in East Africa.







SWAT model was used to simulate the catchment hydrology making use of its ability to make changes in the catchment land use. Rainfall was used as input to the model and flow data from a gauging station at Mara mine was used to calibrate the model.A simulation of 25 years was done (1973--1997) for the current situation and another 25 years for future scenario where land use was changed to reflect the future developments. The results indicated that there was no remarkable change in the water yield for the two scenarios (only \mbox{1.4\,\%} increase from the present to the future scenarios).







A HEC RAS model used the SWAT simulated flows for the two scenarios as upstream



boundary conditions for simulating the Kirumi wetland profiles at 9 cross sections. The first scenario considered the current situation (upstream boundary condition as simulated hydrograph from current SWAT scenario and downstream boundary condition as current lake stage hydrograph). The second, used the upstream boundary condition a flow hydrograph from SWAT model future scenario and the downstream boundary condition, a lake water level hydrograph future scenario with 2 metre drop from the current trend. Manning's n values for the main channel and the overbank/flood plain were taken from literature considering the situation of the river, in the absence of calibration data.







An IHA model used the HEC RAS model results for the two scenarios at the nine cross sections to calculate the hydrologic alterations values. Comparing the pre impact (present scenario) and the post impact (future scenario), results showed no significant change in the parameters of flow in the wetland.







It was thus concluded that, even if the lake water levels goes down to pre sixties levels, and the upstream catchment land use changed (more land converted into farms), the ecosystem functions of the wetland will still be sustained. }

\vspace{0.5cm}
\end{abstract}
\end{center}
\noindent \textbf{Keywords:} Ecohydrology, Hydroinformatics tools, Wetland
\index[key]{Ecohydrology}
\index[key]{Hydroinformatics tools}
\index[key]{Wetland}
\end{document}