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<blockquote data-quote="Allen" data-source="post: 328781" data-attributes="member: 389">Yes, clay soils have a tendency to develop cracks when they dry out.&nbsp; So the next time you get a big rain, the water which often runs off, runs down into the cracks instead.&nbsp; This sudden introduction of water at depth can really affect the shear strength of soils and allows for rapid development of failures.&nbsp; And as the link suggests, developers are OFTEN the cause of slumps in ND.&nbsp; Flatten a hilltop by pushing the crest over onto the side of the hill to give as much flat ground for new homes is a big cause of failure in ND. Then you add the weight of homes, landscaping, and over-watering of a lawn and you are essentially pushing the hillside down slope.&nbsp; I am pretty sure this is the cause of the problem at most of the slumps around Bismarck.&nbsp; How/why developers don't get their feet held to the fire on stuff like this is beyond comprehension when a fairly simple geologic assessment would help prevent such expensive problems.</blockquote>

[QUOTE="Allen, post: 328781, member: 389"] Yes, clay soils have a tendency to develop cracks when they dry out. So the next time you get a big rain, the water which often runs off, runs down into the cracks instead. This sudden introduction of water at depth can really affect the shear strength of soils and allows for rapid development of failures. And as the link suggests, developers are OFTEN the cause of slumps in ND. Flatten a hilltop by pushing the crest over onto the side of the hill to give as much flat ground for new homes is a big cause of failure in ND. Then you add the weight of homes, landscaping, and over-watering of a lawn and you are essentially pushing the hillside down slope. I am pretty sure this is the cause of the problem at most of the slumps around Bismarck. How/why developers don't get their feet held to the fire on stuff like this is beyond comprehension when a fairly simple geologic assessment would help prevent such expensive problems. [/QUOTE]

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