Holland Stormwater Master Plan
FTCH has conducted a number of stormwater management studies for the City of Holland. Our evaluation began with a survey and condition assessment of the City’s stormwater infrastructure. Water quality concerns, particularly sediment and phosphorus, are a high priority due in part to a phosphorus TMDL for Lake Macatawa, which is the receiving water for all the City’s stormwater discharges. FTCH proposed to begin with the fixed runoff concentration methodology used by the MDEQ for consistency and refine the calculations for each City watershed.
FTCH reviewed the current City floodplain to determine if revisions are needed to meet current NFIP standards or improvements can be made to reduce flood insurance rates for its citizens. An application guide for BMPs, summarizing applicability for transportation corridors, small sites, City infrastructure projects, private developments, and stormwater hot spots were prepared. Based on the current activities, historical activities, and the infrastructure assessment, an O&M plan was developed that identifies critical infrastructure components that present a significant risk to the operation of the storm sewer system should they fail and, therefore, require consistent maintenance.
We reviewed the current City design standards and construction specifications for stormwater management and focused on suggested revisions to provide a sustainable stormwater management program consistent with the City’s MS4 permit and the best capital investment for the City.