WMO Design Calculators and Model Templates Breadcrumb Home Doing Business Watershed Management Ordinance and Infiltration/Inflow Watershed Management Ordinance (WMO) and Technical Guidance Manual (TGM) WMO Design Calculators and Model Templates WMO Calculator WMO Calculator(Excel file contains all calculation tools as separate tabs) WMO Model Templates Development (zip file) Redevelopment (zip file)