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These goals, or combinations of these goals, as they are pursued within an urban region, have the potential to influence greatly the type of drainage subsystem selected. Planning for drainage facilities should be related to the goals of the urban region and should be looked upon as a subsystem of the total urban system, and should not proceed independently of these considerations. STORM DRAINAGE IS A PART OF THE TOTAL URBAN ENVIRONMENTAL SYSTEM. THEREFORE, STORM DRAINAGE PLANNING AND DESIGN SHALL BE COMPATIBLE WITH COMPREHENSIVE LAND USE PLANNING. 1.2.2 Planning Review Policies There are four levels of drainage planning which start at conceptual Master Plan levels and focus down to drainage plans and specifications. Initial planning is in the form of a Drainage Basin Planning Study which was previously described as being directed by broad general framework goals. The next level of planning is a Master Development Drainage Plan which provides a greater level of hydrologic and hydraulic detail as well as interface requirements with the Drainage Basin Planning Study. A Master Development Drainage Plan is typically the first drainage submittal required for a comprehensive development plan. However, if a current Drainage Basin Planning Study has not already been completed, the developer may be required to perform the study. In addition to master drainage plans, each new development will require a Preliminary and Final Drainage Reports. Each of these levels of drainage planning and design is further defined here. Drainage Basin Planning Study - A Drainage Basin Planning Study (DBPS) involves an engineering and planning study of a drainage basin which is tributary to a major receiving stream. Within El Paso County there are 13 major basins, 23 receiving streams and 139 designated drainage basins. Within the City of Colorado Springs, there are 27 designated drainage basins which are cross referenced to the County basins in a recent report completed in May, 1986 entitled, Drainage Data Base - Drainage Basin Identification and Fee Estimation Report. Key tables which summarize the drainage basins have been included in Chapter 3 of this manual. 1-3 I I I I I I I I I I I I I I I I I I I