Effect on Existing Facilities
TxDOT drainage projects must be designed so that they do not have a negative impact on existing facilities either upstream,
neighboring
or downstream of the project. A channel’s
must be determined to evaluate the risks and potential impacts of flooding
. The designer must define the upstream and downstream water surfaces until the effects of the new drainage facility match the pre-project hydraulic grade line. The proposed project must not induce flooding during the event for which it was designed.