As to drainage facilities located downstream and beyond the boundary of the parcel, the drainage system within the parcel shall be designed such that there will be no increase in peak discharge or runoff rates as a result of the development unless said downstream facilities located beyond the limits of the parcel are sufficient to accept:
(A) The water runoff from the parcel after development;
(B) The present water runoff from developed areas upstream;
(C) The present water runoff from undeveloped areas upstream; plus
(D) The present water runoff of those areas through which the drainage facility passes.
(1991 Code, § 134.31)