Step 4: Check the Pitch

The pipe should slope toward the dry well ¼ inch per foot of run. A 2-foot level will show a ½ inch gap under one end when held level. Adjust the pitch by adding or removing soil under the pipe. When the pitch is set, attach the adaptor to the downspout using stainless-steel sheet-metal screws, then backfill around the pipe. Trim the opposite end if it's too long.
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    Tools List

    • trenching shovel
      Spade shovel
    • tarp
      Plastic or canvas tarp
    • wheelbarrow
    • two-foot level
    • 30-foot tape measure
      Tape measure
    • hammer
    • drill
    • reciprocating saw
      Reciprocating saw

    Shopping List

    1. Flo-Well dry well

    2. Overflow emitter

    3. Landscape fabric

    4. ¾-inch rounded stone, washed

    5. 4-inch-diameter PVC pipe6. 4-inch-diameter 90-degree elbow

    7. Downspout adaptor

    8. PVC cement

    9. Stainless-steel sheet-metal screws