Terraced retaining wall suggestions

[obzpae]

Hi:

I have a backyard that needs terracing. The slope is approximately 1 on 1. The dimensions are 60 feet wide and 30 feet high. There are water seeps in the hill and a drainage channel that runs down the middle. The water flows during the Spring and I would like to build walls that can retain the soil and allow the groundwater to be releived and provide a drain to accomodate the Spring rains. The soils are silty sands and there is bedrock present within the hill. Any suggestions on the best type of walls to be constructed for these parameters? Each wall would be 4 to 5 feet in height. Also can a type of planting be recommended for each terrace? The location is New York, near NYC.


Thanks,

John G.

 

[ishvaaag]

There are prefabricated reinforced or prestressed elements that can be suseful to you and even cheap; they further will be permeable if you leave joints open. For better appearance use in situ concrete with lots of proper drining pipes plus filters.

Other thing, 45 deg is not my idea of the natural slope of silty grounds. I have seen such slopes making up highwats, when rain comes it is washed down to more natural levels.
Anyway, through mechanical retention, you can go it seems where you want. Also, of course respect present drainage channels.