# Left alignment of text in table

how do I left align this table? I do not want to justify it.

    \centering
\caption{Characteristics and classification of hydrological model}
\begin{tabular}{ p{4.9cm} p{4.9cm} p{4.9cm} }
\hline
Empirical model & Conceptual model & Physically based model \\
\hline
Data based or metric or black box model &
Parametric or grey box model &
Mechanistic or white box model \\
\hline
Involve mathematical equations, Derive value from available time series &
Based on modeling of reservoirs, Include semi empirical equations with a physical basis &
Based on spatial distribution, Evaluation of parameters describing physical characteristics \\
\hline
Little consideration of features and processes of system &
Parameters are derived from field data and calibration &
Require data about initial state of model and morphology of catchment \\
\hline
High predictive power, low explanatory depth &
Simple and can be easily implemented in computer code &
Complex model. Require human expertise and computation capability \\
\hline
ANN, Unit hydrograph &
HBV model, TOPMODEL &
SHE or MIKESHE model, SWAT \\
\hline
\end{tabular}
\source{Gayathri K Devii et al. (2015) \cite{CITE26}}
\label{tab:table2}
\end{table}


• Try \begin{tabular}{ *{3}{>{\raggedright\arraybackslash}p{4.9cm} } }. If you will extend your code snippet to complete small document (MWE: Minimal working Example) beginning with \documentclass and ending with \end{document}, I can provide complete answer. May 24 at 0:37
• May 24 at 8:04

I suggest you (a) switch from a tabular to a tabularx environment and set the width of the tabularx environment to \textwidth, (b) use \RaggedRight in all 3 columns, and (c) use fewer but well-spaced horizontal rules.

\documentclass{article} % or some other suitable document class
\providecommand{\source}[1]{{\footnotesize\raggedright Source: #1\par}} % ??
\usepackage{tabularx,ragged2e,booktabs}
\newcolumntype{L}{>{\RaggedRight}X}

\begin{document}
\begin{table}
\caption{Characteristics and classification of hydrological model\strut}
\label{tab:table2}
\begin{tabularx}{\textwidth}{ @{} LLL @{} }
\toprule
Empirical model & Conceptual model & Physically based model \\
\midrule
Data based or metric or black box model &
Parametric or grey box model &
Mechanistic or white box model \\
Involve mathematical equations, derive value from available time series &
Based on modeling of reservoirs, include semi empirical equations with a physical basis &
Based on spatial distribution, evaluation of parameters describing physical characteristics \\
Little consideration of features and processes of system &
Parameters are derived from field data and calibration &
Require data about initial state of model and morphology of catchment \\
High predictive power, low explanatory depth &
Simple and can be easily implemented in computer code &
Complex model. Require human expertise and computation capability\\
ANN, Unit hydrograph &
HBV model, TOPMODEL &
SHE or MIKESHE model, SWAT \\
\bottomrule
\end{tabularx}

\smallskip
\source{Gayathri K. Devii et~al.\ (2015) \cite{CITE26}}

\end{table}
\end{document}