drainage drainage reclamation channel is an outdated way to lower groundwater levels. dikes of gray stones. supplies water to irri

agriculture architecture blue bridge can channel concrete dam dikes dirt distribution ditch drainage dry english farm farmer farming field fields flood footbridge garden gray groundwater gutter irri irrigate irrigation landscape landscaping lawn level levels lower lowlands nature outdated park polder protection rainwater reclamation renovation road rock solution source stone stones stream supplies supply swamp system technical trash wall water way wetland