First, your water ...

First, your water requirement @ 3 l/m2 (maximum) per day with micro irrigation = 5000 *3= 15000 lpd. 

Second your storage capacity : How many days' support you need from the farm-pond? Apart from rainy season. Say, If 200 days for example, then the pond capacity should be 15000 LPD*200 days  = 3 million liters + allowance for evaporation losses. Considering depth of farm pond at 3 meter and storage embankment above ground = 3 m, you will need apporx 900 sqm land for the pond. The pond must be fitted with pond-lining film availabe all over.  

Where are you situated? Because cost you have to work out as per your conditions / rates / currancy. 

Share your e-mail, I can give you detailed design.