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• .• <br />hi. <br />■fe <br />h--: <br />te'-: <br />ft-fe.‘. <br />?i.-• *h' ..^ <br />M- <br />h’ <br />0-'. <br />M;. ^ <br />Iv^'-- <br />h--. <br />KVV-li*’* • <br />4- <br />,. i <br />.‘•‘j '•:?.*■*’ <br />5. A permit shall be required for the placement of <br />riprap shore protection along Lake Superior and <br />any officially designated trout stream. <br />If the proposed riprap shore protection cannot meet all <br />of the preceding restrictions, a permit from the Depart­ <br />ment of Natural Resources is required. Contact the ap­ <br />propriate regional office or the Division of Waters in <br />St. Paul for the necessary application forms. <br />Riprap shore protection not requiring DNR permits shall <br />be placed according to the following guidelines. <br />DEFINITION <br />Riprap shore protection is defined as coarse stones, <br />boulders, cobbles, or artificial broken rock fragments or <br />concrete brick materials, loosely laid against an exist­ <br />ing bank of a public water for the purpose of preventing <br />or controlling erosion. Only natural rock riprap shore <br />protection may be installed without a permit. Riprap <br />shore protection is generally placed to prevent erosion <br />by wave action and currents. It is also useful in pre­ <br />venting burrowing animals (muskrat, beaver, etc.) from <br />undermining bank stability. <br />LOCATION <br />The placement of riprap should be limited to the area <br />subject to erosion. This information pamphlet outlines <br />guidelines for the placement of natural rock riprap with­ <br />out a permit which includes hand-placed riprap, dumped <br />riprap, and gabions (wire-enclosed riprap). The instal­ <br />lation of other types of riprap will require a permit. <br />Riprap shore protection shall be attempted only where <br />site soils are capable of supporting riprap. Such soils <br />may include various combinations of sand, silt, and clay. <br />Soils such as peat and muck are not capable of supporting <br />riprap. <br />PLACEMENT <br />Of the three types of riprap placement - hand- <br />dumped, and gabions - dumped stone is preferred, <br />stone is the most flexible and will adjust itself <br />even bank settlement. Dumped riprap is usually <br />from trucks and spread by a bulldozer or crane, <br />cases, dumped stone is also the least costly. <br />placed, <br />Dumped <br />to un­ <br />applied <br />In most <br />"1«f <br />1 <br />I <br />Im <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />y. <br />I <br />I <br />I <br />I <br />k <br />k <br />* r-f> -