flopped nut straight HU against probable flushdraw

[MoDOH]

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Once he bets out on the flop I am thinking flushdraw. It´s not a read i have on this guy it´s just that when they underbet the flop like that it´s usually a flushdraw...
Is it better to raise to something like 50 here? So that he doesn´t get odds to draw to his flush?

UTG ($138.85)
Hero ($195.65)
Button ($186.1)
SB ($242.66)
BB ($126.3)

Preflop: Hero is MP with Q/images/graemlins/diamond.gif, T/images/graemlins/diamond.gif. SB posts a blind of $1.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $10</font>, <font color="#666666">2 folds</font>, BB calls $8.

Flop: ($21) A/images/graemlins/heart.gif, K/images/graemlins/heart.gif, J/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $4</font>, <font color="#CC3333">Hero raises to $20</font>, BB calls $16.

Turn: ($61) 6/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $10</font>, Hero calls $10.

River: ($81) K/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $20</font>, Hero calls $20.

Final Pot: $121

[MoDOH]

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[djoyce003]

You made the right reraise.....you could have raised something like 30 instead of $20. You want him to call those big bets...probably should have folded when the flush hit and he donkbet....the best way to play against these guys is charge them full pots, then don't pay them off when they hit. You paid off his flush sufficiently to make his $20 call about right.