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22.06.2015
Never place the outlet where it will simply move the drainage problem to a different area (especially someone else's property). Contact your local authorities if you plan to connect your drain to any municipal, county or state drainage or run off system. Contact your local authorities if you plan to connect your drain to any creek, stream or other body of water. Starting at the spot designated for the outlet, dig a 12- to 18-inch deep by 8-inch wide trench to the spot designated for the basin.
Good to KnowMany pipe connections in landscape drainage, including those to catch basins, are not designed to be watertight. Secure hardware cloth to the outlet end of the pipe to keep small creatures from nesting in and clogging your drainage system. Good to KnowPlace gravel or pour a small concrete pad immediately adjacent to the outlet to disperse the water and inhibit erosion. Our 2010 blog entry by James Urban, FASLA, on the topic of how deep tree roots grow is consistently one of our most popular. Roots require three things: water, oxygen, and soil compaction levels low enough (or with void spaces sufficiently large enough) to allow root penetration. Early studies of tree roots from the 1930s, often working in easy-to-dig loess soils, presented an image of trees with deep roots and root architecture that mimicked the structure of the top of the tree.
The most typical limitations to tree rooting in urban areas are soil compaction and poor drainage. Orjan Stahl, a tree researcher in Stockholm, made an exhaustive study of over 500 trees that had root and utility conflicts. Given all this, and the unpredictable site constraints of the urban environment, urban trees need flexible solutions that can enable roots to grow out or down.


Two other factors are absolutely critical to the ability of roots to grow though the entire soil profile: the type of soil that is used, and designing the system to permit adequate water into and to drain out of the soil. My experience with olives is also that they tend to be shallow rooted, but I must admit to not being an expert on olives! Portable plastic water storage tanks & portable utility tanks rotationally molded using FDA approved polyethylene resins, these tanks are suitable for fresh potable drinking water. CLICK HERE to Visit Our Blog– for a Wealth of JoJo water tank & Rainharvesting info! If you have a problem with poor drainage, you can correct it with a little work and some simple tools. Before installing the basin, place 6 inches of gravel under the basin to eliminate standing water. In some sites, increasing soil depth is not a problem, while expanding may be limited by other constraints. This is a strategic compromise between the system’s structural requirements, soil volume, and cost and constructability issues. These features must be designed to reflect the environment in which the Silva Cells are to be placed, the types of soil resources available and the project performance expectations of trees, soil and water. These photos are more useful as an illustration of how deep tree roots will grow under the proper conditions.
A colleague here believes that olive trees are deep routed to allow them to grow in dry climates but my experience has been that they are shallow routed. Be careful to keep the trench bottom flat so you don't have high spots in the corrugated pipe that may hamper the flow of water. Once you backfill the trench and area around the basin, the soil will seal the connections.


Later work on urban trees that were planted in more compacted soils more often found very shallow, horizontal root systems.
The Silva Cell was designed to provide a deep soil volume because roots will grow to these depths. So, while trees do tend to have certain rooting habits, you will see variation depending on the planting conditions. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted. Urban foresters have successfully spent a lot of energy trying to make people understand that tree roots have a basically horizontal orientation, to the point that even many tree professionals now believe that deep roots in trees are a myth. This is why the Silva Cell system is flexible in all three dimensions to respond to different spatial limitations. For urban sites where deep excavation is limited, one- or two-layer systems can provide the same total soil volume across a shallower profile. Kalicz summarized previous root depth studies of 49 genera and 211 species growing in a wide variety of soil types. They found numerous examples of trees reported to be growing roots to over 33 feet (10 meters), and one report of a tree that grew roots to a depth of 174 feet (53 meters). Clearly, a tree’s ability to grow deep roots is not a significantly limiting factor in soil design.



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