# Draining bathtub geometry using TikZ

How can I draw this sketch using TikZ?

Has anyone done something similar?

• 1) next question is which hemisphere do you want since looking up a hole from a pole makes a difference, perhaps show us what you tried ? – user170109 Mar 11 at 14:34
• I'm voting to close this question as off-topic because this is do-it-for-me question. – Raaja Mar 11 at 15:40

Welcome to TeX-SE! You can use parametric plots to get something of that sort.

\documentclass[tikz,border=3.14mm]{standalone}
\begin{document}
\begin{tikzpicture}
\foreach \X in {0,45,...,315}
{\draw[green!60!black] plot[variable=\x,domain=0:4,smooth,samples=51]
({10*\x+\X-40/(\x+0.2)}:\x);}
\foreach \X in {1,2}