rain water harvesting pond

Hi everyone

 Looking some information about rain water harvesting methods for dry season  irrigation system ?

pond size/dimensions/ for 5000m2 irrigate  land area for 8 months seasons?

effective way of pond construction ?

pond cover to prevent evaporation?

operating time?

quick grow and valuable crops?

other valuable information .....if you have full design data  Please send me no matter the raw data different .

Thank you .