Drainage Plan

Chapter 8, Section 8-29B of the Montgomery County Code establishes the requirement to control water runoff due to construction of a new single-family dwelling or for additions to single family dwellings located on properties with a lot size of less than 15,000 square feet and where a stormwater management plan has not already been approved. A drainage plan is also required for any new detached Accessory Dwelling Unit regardless of the building square footage or lot size. The applicant must submit a drainage plan that will show the proposed measure to ensure control and/or safe conveyance of any runoff caused by the new construction.