revise columns and types on the rivers database
revise columns and types on the rivers database

r-barnes/waterviz,HydroLogic/waterviz,HydroLogic/waterviz,NelsonMinar/vector-river-map,HydroLogic/waterviz,r-barnes/waterviz,r-barnes/waterviz,r-barnes/waterviz,HydroLogic/waterviz,NelsonMinar/vector-river-map,NelsonMinar/vector-river-map,NelsonMinar/vector-river-map