First basin: 2 foot deep basin; line bottom with nylon mesh and straw landscape cloth to stabilize
fill basin with 18 inches 1/2-3/8" gravel; plant in gravel and top with 2 " soil and 3" mulch
maintain water level at 2 inches below gravel surface
surround basin with berms to prevent rainwater from flowing in
Water control structure between first and second basin: 2" header pipe (with vertical clean outs); gravity flow to flexible pipe chained to inside of control structure
adjust water level in first basin by raising and lowering flexible pipe; water leaves control structure through 2" pipe to second basin and is distributed through 4' long header pipe.
2" PVC header pipe lies horizontally across the basin and is drilled with 3/8" holes spaced 6" apart on top, bottom and sides of pipe. Header also includes vertical cleanout pipes.
Second basin: same as first but not liners and has only an inlet header (2"). Serves as drain field. Basin has 4" monitoring pipe with 1/4"holes below surface of water to allow water to flow thru.
Planting 1st basin: plants already existing like bulrushes, sedges, sensitive fern, water horehound, arrowheads