Sump protection

If in doubt - Stop and Shout! Install erosion & sediment control measures (bunding, sump covers and silt fences) before works begin.

For best effect, to prevent run off of muddy/silty water into
gutters and drains, combine the following three measures:

Bunding
The drain is surrounded by a sediment sock/tube or sand bags, which traps sediment but still allows water to flow through to prevent flooding.
Covering
This must be well secured to prevent water seeping through. If the drain grate can be lifted, place a sheet/plastic under it and hold in place by the grate.
Catch pit (Sump protection)
Install a specially designed bag inside the drain sump which catches any dirty/silty run-off but allows water to flow through.

Not suitable for concrete and paint wash water.
These measures should be checked daily.