MCM 2 : POST-CONSTRUCTION STORMWATER CONTROL MEASURES I . Areas of New Development and Significant Redevelopment
The City of The City of Arlington ’ s Unified Development Code ( UDC ), formerly the Subdivisions Ordinance , acts as the regulatory mechanism for the enforcement of post-structural stormwater controls . The UDC specifies in Article 6 , Section 6.1 , H , that one of the purposes of the regulation is to : “ minimize the pollution of streams and ponds ; to provide for the adequacy of drainage facilities ; to control stormwater runoff ; to minimize erosion and siltation problems , to safeguard the water table ; to encourage the wise use and management of natural resources ; and enhance the stability and beauty of the community and the value of the land .”
The UDC also provides that each subdivision ( development ) shall provide “ adequate public facilities ” that include the drainage necessary to serve the proposed development ( see UDC , Article 6 , Section 6.2.1 ). Drainage and stormwater facilities are adequate when : ( 1 ) stormwater runoff attributable to new development or redevelopment complies with the minimum standards of the UDC and the Design Criterial Manual ( DCM ); and ( 2 ) to the maximum extent practicable , permanent BMPs , as described in the DCM , maintain the predevelopment characteristics of any natural creek that ultimately receives stormwater runoff from the development . That is , “ designs for development shall manage stormwater in a manner that protects and / or improves stormwater quality by addressing the development ’ s potential to cause erosion , pollution , siltation , and sedimentation in the MS4 and natural creeks . The goal is to maintain after development , to the maximum extent practicable , the predevelopment characteristics of stormwater runoff from the development . It is the developer ’ s responsibility to ensure that designs for the development meet the stormwater management requirements of adopted City Codes ” ( see UDC , Article 6 , Section 6.5.1 , D .)
The Design Criteria Manual was adopted by City Council Ordinance in June 2003 and went into effect on August 12 , 2003 . Various stormwater revisions made between 2003 and 2010 were described in past Annual Reports . Stormwater related revisions to the Design Criteria Manual including the Public Improvements submittal process , stormwater standards , permit process and terminology , definitions and regulations for public improvements and street appurtenances were adopted in January , April and June of 2010 . The City continues to apply the Design Criteria Manual requirements to new developments .
In 2013 , the City selected a consultant to update the City ’ s Design Criteria Manual and create a Unified Stormwater Ordinance . Draft DCM and ordinance documents were created and submitted to city staff and an external advisory committee for review between 2014 and 2017 . However , upon presentation to executive management in June 2017 , the decision was made not to move forward with a Unified Stormwater Ordinance but to continue revision of the DCM only . Stormwater related ordinances ( Stormwater Pollution Control and Floodplain Administration ) will be revised and updated separately and presented to City Council in late 2019 .
II .
Flood Control Projects
The City completed the following drainage and / or erosion projects during the reporting period : � Rush Creek at Bowen Erosion – Streambank stabilization to protect Bowen Road as well as structures on private property . � Laguna Vista Drainage Improvements – drainage improvements to alleviate residential flooding � Meadow Park Estates Drainage Improvements - drainage improvements to alleviate residential flooding � North Fork Cottonwood Creek Channel Repair ( South of Park Row ) Phase 1 – channel improvements to repair erosion and undermining that occurred during the May / June 2015 storm events that is threatening adjacent buildings and overall channel improvements to repair a channel that is deteriorating .
CITY OF ARLINGTON TPDES STORMWATER ANNUAL REPORT – FY 2018
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