(husband and wife filed suit in county court seeking damages against neighboring landowners for dumping of rubble and dirt in ravine partially owned by plaintiffs; plaintiffs argued rubble damaged property value; county court dismissed suit on basis that plaintiffs failed to prove decline in value and costs of restoration; district court reversed; appellate court affirmed district court on basis that county court erred by placing burden of proof on plaintiffs to prove costs of restoration and decline in property’s value).