channel having u2018 u u2019 shape connecting chamber 1002 e g made of rigid material with swivel joints may be used to allow the ships to cross the channel without damaging the device the u2018 u u2019 shaped connecting chamber 1002 may be in horizontal position which may be dip down to vertical position using the ships force allowing ships to cross and return to horizontal position after the crossing of ships fig1 is a cross section view of a rain water collecting film according one embodiment particularly fig1 illustrates the flush outlet 110 which has a valve and a discharge outlet 1102 which has a valve according to one embodiment fig1 illustrates the collection of rain water through the rain water collecting film coupled to the float 206 the discharge outlet 1102 may be used to discharge the collected rain water to the open and closed type channels condensed water collector 1104 is provided on the underside of the film to collect condensed fresh water that condenses on underside fig1 is a top view of a rain water collecting film according one embodiment particularly fig1 illustrates the top view of the rain water collecting film that may be connected to the open channel 102 along with flush outlet 110 and the discharge outlet 1102 fig1 is a cross section view of vegetation growing section according to one embodiment particularly fig1 illustrates the cross section view.