Low water production

[Siestabob]

I have 4 sandpoints at about 23' all connected to one pipe equal distance apart. I have a 1 hp Flotec pump and the size of the pipe is 1 1/4. For the first 5 mins. I get about 15 gpm then after that production slides off to about 6 gpm. What is the problem do you think? I need to have at least 14 gpm for lawn watering. What is the usual time alotted for watering lawns?
Thanks
Bob

 

[Speedbump]

Your wells are only supplying that much water. You may need to put in 4 more to almost double the production. Where is the water level in these wells?

There is no usual time to water a lawn, it depends on how much water is needed and how much is applied.

bob...