|
Take Action at Home - Infiltration |
New Postings Take Action Board |
Credit: David Wallace, Severn River AssociationBuild an infiltration system to collect stormwater on your property and return it to the ground. This will keep nutrients and sediments from entering the Creek and replenish groundwater systems.
CobblesCobbles are random diameter round/flat stones. They are often referred-to as washed gravel or tailings and are used for drainage structures because of their void ratio. A bucket or trench full of cobbles is 40% air. That air space is filled with water when it rains. The table above, Infiltrator Sizing, will help you compute quantities. Note that the larger stones are especially for the exposed surface because they are heavier and will absorb the moving waters energy better than smaller stone. However, it is easier to handle or shovel 3/4" washed gravel so one may choose to use smaller gravel below grade and the larger cobbles on the surface. Cobbles of 1-3" diameter are called "2 inch" and sell by the ton. Delivery may cost extra.There are approximately 1.5 tons per 1 cubic yard. Drains and GratesT'here are many choices for surface drains that can be installed in new or existing concrete and gravel driveways. Since they are sold as components, it's easy to fit any situation. If a vehicle will be driving over it, use steel or cast iron systems. For custom applications steel and cast iron grate is available by the foot.
Sources |