The Douglas County Storm Drainage Design and Technical Criteria Manual specifies the policies and minimum technical criteria for the planning, analysis, and design of storm drainage systems within unincorporated Douglas County. Chapter 14 - Stormwater Quality - Updated June 2022; Public Works Phone: 303-660-7490. Public Works Location The plan provides details with respect to the proposed environmental and stormwater management measures, and is usually submitted with grading and erosion plans and site servicing plans. Several documents detail the requirements of these reports. The specific requirements will vary from municipality to municipality. urban storm drainage criteria manual summary of changes to volume 1 preface 1.0 acknowledgements 2.0 purpose of the manual 3.0 list of abbreviations 4.0 open-channel design criteria 5.0 rectangular conduit 6.0 large pipes 7.0 protection downstream of culverts 8.0 sediment 9.0 examples 10.0 references Unified Sizing Criteria is a comprehensive approach to design stormwater management systems. It uses measurement standards to meet flooding, health, safety, and water quality goals. These criteria are used to design best management practices that meet desired treatment objectives. The Unified Sizing Criteria is used to manage stormwater with engineering techniques that protect our streams, rivers, and lakes. The Stormwater Release Rate must be no more than the greater of 0.25 cfs or 10% of the Allowable Flow or, if the Allowable Flow is less than 0.25 cfs, no more than the Allow- able Flow. Storm Drainage Criteria Manual Provides criteria and design standards for the many different conditions within the Urban Drainage and Flood Control District. NOTICE: The Storm Drainage Criteria Manual Has Been Updated In October 2016, the Boulder County Board of County Commissioners approved an update to the Storm Drainage Criteria Manual. Download Urban Stormwater Drainage - Criteria Manual - Volume 01 (0USDCM Vols 1 2 Dec 2011 ) Urban Drainage Design Manual. 09 Ch7 Stormwater Drainage. Urban Drainage. Urban Drainage. Urban Drainage. Elements of Urban Stormwater. 12 01 2011 Dec Online TN 1. Hiilly Urban drainage IITG.pdf. URBAN DRAINAGE DESIGN GUIDE.pdf. criteria providing equivalent results are obtained. 1.2 Applicability: These criteria are applicable to all new storm drainage systems and facilities and to the rehabilitation of existing drainage system facilities. 1.3 General Requirements: The design shall be accomplished under the direction of a Registered Professional Engineer. The standards and criteria in this document are promulgated to implement the inent to f the stormwater management ordinances managing urban stormwater. To foster clarity and expediency in use of these Guidelines, a limited series of terms has been specially STORMWATER DESIGN GUIDELINES Page 3 of 18 SECTION II: POLICIES . 3. Land The purpose of this BMP design and maintenance manual is to provide design criteria and guidelines for developers, to assist the County in the review and Development Planning for Stormwater Management - A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), dated September 2002, prepared by the LACDPW; and protection criteria. A stormwater management strategy may include protection of natural areas, design of communities to reduce stormwater generation, and pollution prevention programs, as well as the stormwater mana