The idea of using wooded areas as the standard for all sites is very suitable for Maryland, as a glance at Google Earth will show how very wooded our state is. Yet, rumor has it that the next update to the manual will not be so stringent. As it is, the absolute minimum standard already obviates the wooded area criteria, if it turns out to be impractical on any given site. That minimum standard in the eastern part of Maryland is to design stormwater devices to hold an amount based on 1" of rainfall, ensuring that a specified portion of that water volume drains into the ground to recharge the aquifer. I hope they hold to the more rigorous ESD standard because the Chesapeake Bay will flourish if we can insulate it from the effects of our exploits on the land.
|Photo by Birgit Speulman (CC BY-NC-SA 2.0)|
Here in Southern Maryland, we have a lot of Beltsville soils which are typified by a fragipan layer that is practically impenetrable. It may even reform after being broken up. Here again, biochar could help if it could be injected in fragipan layer breaches, preventing it from reforming. For the gardener, this might involve digging with a post hole digger and dropping biochar into smaller holes that have been chiseled through the fragipan. This would improve drainage considerably and eventually eliminate the fragipan through microbial action.