Drainage planning with professionals a must.
When you design your home and determine that a drainage professional is a value added necessity to the health of your home, also discuss your plans with your family, friends and business associates.
Most general contractors do not approach the drainage business with enough experience. Most contend that is the way everyone does it.
These people can help you to understand their experiences with drainage professionals, or with other contractors who said they were drainage professionals, and did not perform up to their expectations.
Discuss the drainage plan with your city and county officials to determine if the suggested methods of water disposal are adequate, and correct for your site and the community and neighbors that will have to live with it. Put the drainage work in your original budget and be prepared to do so after the proposals have been written and reviewed. Do not just put in some arbitrary amount ahead of time for drainage as suggested by your general contractor.