▁of ▁rocks , ▁mud ▁and ▁nut ri ents . ▁Mand el hol z ▁Dam ▁Up stream ▁dam ▁on ▁the ▁Kal te ▁B ode , ▁which ▁r ises ▁at ▁the ▁foot ▁of ▁the ▁Bro cken . ▁Flo od ▁protection ▁and ▁ret ention ▁of ▁rocks ▁and ▁nut ri ents ▁ahead ▁of ▁the ▁main ▁bar rier . ▁W en def ur th ▁Dam ▁Supp lement ary ▁dam ▁down stream ▁which ▁acts ▁as ▁flo od ▁protection ▁and ▁stores ▁water ▁for ▁the ▁W en def ur th ▁P ump ed - Storage ▁Power ▁Station . ▁ ▁History ▁ ▁The ▁earliest ▁discuss ions ▁about ▁building ▁flo od ▁protection ▁bar riers ▁took ▁place ▁following ▁dev ast ating ▁flo ods ▁at ▁the ▁beginning ▁of ▁the ▁ 2 0 th ▁century . ▁These ▁en vis aged ▁a ▁number ▁of ▁m ason ry ▁d ams ▁being ▁constructed ▁across ▁the ▁trib ut aries ▁of ▁the ▁B ode ▁river . ▁The ▁first ▁concrete ▁plan , ▁however , ▁was ▁to ▁build ▁just ▁one ▁dam ▁but ▁this ▁would ▁have ▁meant ▁sacrific ing ▁a ▁number ▁of ▁villages . ▁The ▁event ual ▁project ▁work ▁was ▁completed ▁in ▁ 1 9 3 8 ▁and ▁proposed ▁a ▁plan ▁which ▁avoided ▁flo oding ▁any ▁of ▁local ities ▁by ▁construct ing ▁a ▁number ▁of ▁d ams . ▁Const ruction ▁on ▁the ▁R app b ode ▁Valley ▁Dam ▁began ▁in ▁ 1 9 3 8 . ▁Const ruction ▁was ▁halt ed ▁due ▁to ▁the ▁war ▁in ▁ 1 9 4 2 . ▁After ▁ 1 9 4 5 , ▁the ▁newly ▁founded ▁East ▁Germany