Excess water in dry area may be for some negligible time if heavy rains may come and this is part and parcel of all soils/lands in upper areas too.
Still you need to provide complete profile of your land as you alone know more about it, for forum members to post more appropriate views.
Growing vegetables is like playing 20-20 cricket and any one cannot play such game for ever without rest [color=blue][Mod edit: so you may have the leeway to not use the soil during the water logged season][/color]. Adapting to the field situation would be a good option, instead of making costly modifications like filling soil or digging trenchers.
Have any other crops which can sustain with present conditions & need initial care for them and let them take care of you in the future.
Wishing you all the best.
[color=blue][Mod edit: reworded for clarity][/color]