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\begin{tikzpicture}
% axis
% \draw[->] (-1.5,-1.5) to ++(0,5) node[anchor=south] {\(y\)};
\draw[->] (-1,-1) to (6,-1) node[anchor=west] {\(x\)};
% tube lines
\draw[] (0,2) to (1,2) to[out=0, in=180] (4,3) to (5,3);
\draw[] (0,0) to (1,0) to[out=0, in=180] (4,2) to (5,2);
% opening ellipse for A1
\draw[blue!10, fill=blue!10] (0,.025) rectangle ++(.75,1.95);
\draw[fill=blue!10] (0,1) ellipse (.3 and 1);
% ellipse
\draw[dashed, fill=blue!10] (.75,1) ellipse (.3 and 1);
% closing ellipse
\draw[fill=blue!10] (5,2.5) ellipse (.2 and .5);
%% hide half of the ellipse and make dashed
\draw[blue!10, fill=blue!10] (4,2.025) rectangle ++(1,.95);
\draw[dashed] (5,2.5) ellipse (.2 and .5);
% ellipse for A2
\draw[dashed, fill=blue!10] (4,2.5) ellipse (.2 and .5);
% vectors
\draw[thick, ->] (-1,1) to node[near start, above, anchor=south] {\(v_1\)} ++(1,0) ;
\draw[thick, ->] (3,2.5) to node[near start, below, anchor=north] {\(v_2\)} ++(1,0) ;
% heights
\draw[dotted] (0,1) to (2,1);
\draw[->] (1.5,-1) to node[pos=.3, anchor=west, right] {\(h_1\)} (1.5,1);
\draw[dotted] (4,2.5) to (6,2.5);
\draw[->] (5.5,-1) to node[pos=.5, anchor=west, right] {\(h_2\)} (5.5,2.5);
% areas
\draw[thick, blue] (0,.4) to [out=180, in=30] node[at end, anchor=east] {\(A_1\)} ++(-.5,-.4);
\draw[thick, blue] (4,2.2) to [out=210, in=80] node[at end, below, anchor=north] {\(A_1\)} ++(-.5,-.5);
% other symbols
\node at (2,1.5) {\(\varrho\)};
\node at (-.7,2) {\(p_1\)};
\node at (5.5,3) {\(p_2\)};
\end{tikzpicture}
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