S.D. Codified Laws § 58-29B-118
If several claims founded upon one policy are filed, whether by third parties or as claims by the insured under § 58-29B-116 or 58-29B-128, and the aggregate allowed amount of the claims to which the same limit of liability in the policy is applicable exceeds that limit, each claim as allowed shall be reduced in the same proportion so that the total equals the policy limit. Claims by the insured shall be evaluated as in § 58-29B-117. If any insured's claim is subsequently reduced under § 58-29B-117, the amount thus freed shall be apportioned ratably among the claims which have been reduced under this section. No claim may be presented under § 58-29B-116 or this section, if it is or may be covered by any guaranty association or foreign guaranty association.
SDCL 58-29B-118