Preliminary hydraulic studies are needed in the preparation of environmental documentation to evaluate the impacts of the proposed project on waterways and floodplains. Changes in water surface elevation, construction in channels, bridge construction methods, etc. commonly impact water resources. The identification of appropriate temporary and permanent stormwater quality best management practices may require input from the DHE and the District Environmental Quality Coordinator during the environmental documentation phase.

See the TxDOT Project Development Process Manual, for further discussion of the environmental permitting and documentation phase.