ABSTRACT
This chapter provides an overview of this update by the Town of Markham, a municipality in the Greater Toronto Area with considerable experience in SWM implementation. The Markham Stormwater Management Guidelines also recommend that reviewing agencies participate in the Environmental MDP (EMDP) steering committee. The Town of Markham Guidelines also indicate, as an example, that welldocumented presentation of modeling assumptions and results is essential for project approval. The Town of Markham also pursued efforts to improve local implementation of stormwater management techniques. In 1989, it reviewed its initial design storms based on a comparison with multi-event simulations. The EMDP is, however, considered a temporary solution, and adequate funding should be ensured for subwatershed plans. The Markham Stormwater Management Guidelines also recommend that reviewing agencies participate in the EMDP steering committee. The municipality has to consider legal aspects, and the fact that post-construction rehabilitation is expensive and sometimes impossible.
