An organization must define which of its assets are most critical in order to focus its maintenance efforts. Assets with the highest probability of failure (POF) and consequence of failure (COF) come with the highest risk. These assets are most critical to the stormwater system. Use this spreadsheet to calculate the criticality score for each asset based on its POF and COF rankings and redundancy score. Detailed instructions are provided to assist in these calculations.

This guidance, developed by the EPA, is designed to assist small municipal separate storm sewer system (MS4) operators comply with the ‘measurable goals’ permitting requirements. The guidance will assist MS4 operators in developing measurable goals, which allow permitting authorities (such as the EPA) to evaluate the effectiveness of control measures.

This asset inventory spreadsheet allows you to identify the physical assets that make up your system. Information collected includes: the location of the assets, the useful remaining life of each asset, the value of the assets, their current condition, and whether or not they require energy. The starting point for the inventory should be to inspect and inventory particular asset classes, such as your stormwater conveyance system and your stormwater treatment system. This inventory will allow you to make informed decisions about the management of your assets.

During the asset inventory, it is recommended that you inspect and assess the condition of the assets. This will make your asset management program more efficient. Use this inspection guide to make notes as you inspect and assess the condition of each asset.

This site provides a compilation of the EPA's tools for Green Infrastructure implementation, including Modeling Tools, Operations and Maintenance, Design and Implementation, and Funding Opportunities.

The National Oceanic and Atmospheric Administration (NOAA)'s National Ocean Service (NOS) Office for Coastal Management provides a set of tools to help communities understand, plan, and implement Green Infrastructure.