Basement Flooding Protection Subsidy Program With increasingly frequent severe weather events, it is essential that homeowners take appropriate action to reduce the risk of basement flooding. The City offers owners of single-family, duplex and triplex residential homes a subsidy of up to $3,400 per property to install flood protection devices. Eligible work includes: Installation of a backwater valve. Installation of a sump pump. Severance and capping of a home’s storm sewer or external weeping tile connection. Disconnecting the downspouts from your property’s eavestrough system is not eligible for a subsidy.