Conn. Agencies Regs. § 13b-17-44
The work performed under permit shall be planned and carried out so that the drainage system of the highways is effective at all times. Any costs for damages arising from the failure of a permittee to properly keep culverts, ditches, catch basins or any other drainage device from becoming obstructed must be borne by the permittee, and the deposit guarantee or performance bond shall be held by the Department until such damages are paid. When it is necessary to use a ditch or gutter area for the storage of excavated materials, supplies, construction materials or equipment, pipe or culvert of sufficient size adequate to handle normal runoff shall be placed temporarily in the ditch or gutter before the work starts. Extreme care must be exercised to see that such culverts are kept clean at all times.
Conn. Agencies Regs. § 13b-17-44