. ▁ ▁comes ▁from ▁cro pl and , ▁ ▁comes ▁from ▁the ▁banks ▁of ▁streams , ▁and ▁ ▁comes ▁from ▁land ▁used ▁for ▁hay ▁or ▁past ures . ▁A ▁total ▁of ▁ ▁comes ▁from ▁developed ▁land , ▁ ▁comes ▁from ▁for ests , ▁and ▁ ▁comes ▁from ▁wet lands . ▁ ▁The ▁average ▁annual ▁amount ▁of ▁precip itation ▁between ▁the ▁early ▁ 1 9 9 0 s ▁and ▁the ▁early ▁ 2 0 1 0 s ▁was ▁. ▁The ▁average ▁amount ▁of ▁annual ▁run off ▁during ▁the ▁same ▁time ▁period ▁was ▁. ▁ ▁Ge ology ▁In ▁the ▁M ud dy ▁Run ▁waters hed , ▁ 9 0 % ▁of ▁the ▁rock ▁is ▁sh ale ▁from ▁the ▁Blo oms burg / M if fl in burg ▁Form ation ▁Und iv ided ▁and ▁the ▁Will s ▁Creek ▁Form ation . ▁The ▁remaining ▁ 1 0 % ▁is ▁composed ▁of ▁s ilt stone ▁and ▁lim estone ▁from ▁the ▁Key ser / T on ol ow ay ▁Form ation ▁Und iv ided . ▁Most ▁of ▁the ▁western ▁part ▁of ▁the ▁waters hed ▁is ▁on ▁the ▁Blo oms burg / M if fl in burg ▁Form ation ▁Und iv ided , ▁with ▁the ▁exception ▁of ▁a ▁band ▁in ▁the ▁central - western ▁part ▁of ▁the ▁waters hed , ▁which ▁is ▁on ▁the ▁Will s ▁Creek ▁Form ation . ▁The ▁Key ser / T on ol ow ay ▁Form ation ▁Und iv ided ▁occurs ▁in ▁an ▁area ▁in ▁the ▁n ort he astern ▁part ▁of ▁the ▁waters hed .