We will be populating this site with information on future updates to the Manual. We anticipate having this page up-to-date by mid-August. Timelines shown below are approximate.
Updates to the bioretention section
(February-March, 2014). Work on this section has been on-going for several months. See What's new for recent updates to the Manual. Future updates include the following:
- guidance and recommendations for determining soil infiltration rates within infiltration and bioretention BMPs;
- refinement of existing stormwater pretreatment requirements or guidelines for each bioretention and infiltration BMP type;
- guidance and recommendations on the use of soil ripping to increase infiltration capacity of infiltration and bioretention BMPs;
- updated design specifications for bioretention and infiltration BMPs;
- new information on construction methods, construction techniques, and maintenance of infiltration and bioretention BMPs; and
- information on credits for water volume, phosphorus, and total suspended solids.
Creation of a section on trees (urban forestry)
(February-March, 2014). Work on this section (see Trees) has been on-going for the past few months. Several pages have already been added, but the following information will be added in the near future:
- design specifications for tree quality and tree planting;
- construction design specifications for tree stormwater BMPs;
- guidelines for construction activities adjacent to existing trees;
- maintenance guidelines for trees;
- monitoring guidelines for tree BMPs; and
- a fact sheet summarizing the applicability of urban forestry to stormwater management and use of trees as urban stormwater BMP;
Updates to information on infiltration and infiltration constraints
(Spring/Summer, 2014) New information is being added and existing information updated on topics related to infiltration of stormwater. Updates and new information include:
- a section providing an overview of basic concepts related to the infiltration of stormwater;
- a summary of Best Management Practices that can be used for stormwater infiltration;
- a summary of select monitoring studies that investigated groundwater quality impacts associated with stormwater infiltration;
- an overview of area-wide or regional groundwater quality or quantity impacts associated with stormwater infiltration;
- a summary of stormwater pretreatment considerations for protecting shallow groundwater quality;
- a summary of groundwater mounding considerations for infiltrated stormwater;
- a summary of information on groundwater separation distances for infiltrated stormwater;
- updates to information on stormwater infiltration constraints, including Additional Guidance for Karst, Shallow Bedrock, Ground Water, Soils with Low Infiltration Capacity, and Potential Stormwater Hotspots (PSHs);
- a summary of considerations for stormwater infiltration in Wellhead Protection Areas; and
- a summary of considerations and options for stormwater infiltration in areas with contaminated soils or contaminated groundwater, including Brownfields.