9 6   m g ▁/ ▁d m 3 ; ▁summer - aut umn ▁measurements ▁- ▁ 4 0 1   m g ▁/ ▁d m ³ ; ▁winter ▁b arg es ▁- ▁ 4 0 5   m g ▁/ ▁d m ³ . ▁Type ▁of ▁water ▁- ▁hydro car bon ate - cal ci um . ▁[ 2 ] ▁ ▁The ▁ice ▁is ▁most ▁likely ▁to ▁come ▁in ▁the ▁middle ▁of ▁December , ▁on ▁the ▁roll s ▁often ▁left ▁the ▁holes ▁that ▁are ▁stored ▁in ▁places ▁throughout ▁the ▁winter . ▁The ▁river ▁is ▁cr umb ling ▁in ▁the ▁upper ▁reaches ▁at ▁the ▁end ▁of ▁February ▁- ▁beginning ▁of ▁March , ▁in ▁the ▁middle ▁and ▁lower ▁reaches ▁ 1 – 2 ▁weeks ▁later . ▁The ▁upper ▁river ▁is ▁used ▁as ▁a ▁source ▁of ▁hyd rop ower ▁and ▁for ▁fish ▁bre eding . ▁ ▁Most ▁of ▁the ▁bas in ▁is ▁p low ed ▁( over ▁ 6 0 % ), ▁for ests ▁occup y ▁ 1 8 % ▁of ▁the ▁bas in , ▁mar sh es ▁- ▁shall ow ▁can e ▁and ▁shr ub land ▁- ▁were ▁dra ined ▁by ▁ 6 %. ▁Flo od plain ▁me adows ▁are ▁partially ▁s own , ▁cultiv ated ▁or ▁under ▁gra zing , ▁which ▁leads ▁to ▁their ▁de grad ation , ▁as ▁well ▁as ▁fl ushing ▁at ▁high ▁water ▁in ▁the ▁river ▁bed ▁of ▁significant ▁imp ur ities ▁- ▁organ ic , ▁b acter ial ▁and ▁solid ▁run off . ▁ ▁Navigation ▁During ▁the ▁occupation ▁of