Plano storm drainage design manual

Combined References, Forms and Worksheets 3. Full Manual binder cover 2. Full Manual binder spine 0. Appendix C and D covers 2. Flow Control Application Map 1.

Water Quality Application Map 1. Landslide Hazard Drainage Areas Map 1. If you have questions about these changes, contact Mark Wilgus at mark. Dallas Overview. The Dallas City Code. Share Download Bookmark Print. Adequate provision must be made for the acceptance, collection, conveyance, detention, and discharge of storm water runoff drainage onto, through, and originating within the subdivision. No final plat release may be issued until proper provision has been made for drainage. Private systems are owned and maintained by a private entity.

Easements must be provided to allow access by the city to any open system in the event that private system failure or diminished function jeopardizes the public's health, safety or welfare. Private storm water drainage systems must be designed in general conformance with the design standards of the department of water utilities as set forth in the Drainage Design Manual of the city of Dallas.

Private enclosed systems are not required to be constructed according to the Standard Construction Details, File D The portion of a drainage system located downstream from a lot or tract boundary, and the portion of any drainage system within the lot or tract boundary which conveys storm drainage from outside the lot or tract boundary are public systems. Public storm water drainage systems must be designed and constructed in strict conformance with department of water utilities requirements.

Paved streets and alleys, ditches, and swales may be used for emergency overflow capacity in parallel with enclosed systems provided the requirements of the Drainage Design Manual of the city of Dallas are met. Erosion and sedimentation control plans are required in the following instances:.

A When the property to be platted is located in the escarpment or in a geologically similar area See Division 51A A A timing schedule indicating the starting and completion dates of the development activities sequence and the time of exposure of each area. Written approval of the director of development services is necessary to authorize any time of exposure exceeding six months.

B A complete description of all control measures designed to control erosion and sedimentation of soils during and after construction. The owner is responsible for maintenance of erosion and sedimentation control measures during development and shall remove sediment from city right-of-way or storm drainage systems that occurs during the construction phase.

Revegetation of the disturbed area is required as a part of the approved erosion control plan. Detention must be provided in the following instances:. A The property to be platted is in or drains through the escarpment zone or a geologically similar area as defined in Division 51A B The development of the platted area results in an increase to the existing rate of runoff due to a rezoning of the platted area that allows higher density.

Detention will not be required if:. C The proposed development does not have adequate outfall to carry the one-percent annual chance storm event without damaging property downstream, or the owner of downstream property refuses to provide the needed easements to the city. Share Download Bookmark Print. Storm sewers or acceptable surface drainage system utilizing one of the following shall be provided:. Paved Waterways: Paved waterways having a cross section slope not steeper than two to one and a minimum longitudinal profile of one-tenth percent 0.

Storm Water Sewer System: There will be provided storm water sewers or a surface drainage system to serve adequately the area being platted, considering, but not limited to, the following:.

The results and recommendations of the flood insurance study and flood boundary maps. Storm drainage area of which the subdivision is a part, expressed in acreage or square feet. Calculations as to volume and frequency of water to be handled after a year rainstorm. A scheme of culverts sufficient in size to eliminate flooding or ponding of water.

Elimination of grades which may result in erosion or ponding of storm water, and to eliminate problems. A plan of the subdivision's grading to prevent ponding of storm water and to eliminate problems. The sewers shall be designed in such a way as to ensure a minimum velocity flow of two feet 2' per second and a maximum velocity flow of ten feet 10' per second.