Sand boil filter

A sand-boil filter, comprising:

• a water-porous structure having a hollow conical shape and made of a mesh material having a plurality of spaced mesh holes, wherein the water-porous structure is insertable narrow-end down into a sand boil formed in ground to allow water to flow from the ground through the mesh material and out the top of the sand boil, while blocking solid matter larger than the mesh holes from passing through the mesh material and out of the top of the sand boil;
• and further comprising a restraining structure configured to restrain the water-porous structure from being lifted out of the sand boil, said restraining structure selected from the group consisting of (i) a restraining structure comprising a plurality of weighted objects placed within the hollow conical shape of the water-porous structure, wherein the weighted objects are sized to allow water and sediment smaller than the mesh holes to flow between the weighted objects and (ii) a restraining structure comprising arms that extend from the narrow end of the conical, water-porous structure beyond the wide end of the conical, water-porous structure to engage with the ground adjacent to the sand boil and wherein the restraining structure is configurable in a closed configuration in which the water-porous structure has a collapsed, non-conical shape.