“About four years ago my family shifted into my present house which faces a football field. This football pitch is on the lower ground and about five feet deep. Does it has some severe affects or implications on the fengshui of my house”
Facing a lower ground or deep in front of one house could spell different affects of different individual. In general it will be bad. If you are having your own business you might find that your business is not moving or stagnant; difficult to collect due amounts; facing disputes and so on. If you are an employee you will find yourself no promotion and stagnant. If you are a student you might find yourself losing concentration.
The easiest solution is that you can plant some trees opposite your house before the deep. This would act as a buffer between your family and the lower ground.