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I I II . I I I I I I I I I I I I I I I I III. ,INVENTORY OF EXISTING FACILITIES Within the Godding Hollow Basin, the existing storm drainage facilities are largely associated with the limited development that has occurred within the basin. Small, local detention ponds, storm sewers, and conveyance channels comprise the network of drainage facilities that provide flood control during the minor and major storm events. Minimal land development has occurred adjacent to the major drainageway. Consequently, the structures along the major drainageway of Godding Hollow that were investigated as part of this master planning effort include road/railroad/canal crossings and detention storage provided by road/railroad embankments, Within the Tri- Town Basin, the existing storm drainage facilities are largely associated with the development in the vicinity of Frederick and Firestone. Similar to the Godding Hollow Basin, small local detention ponds, storm sewers, and conveyance channels comprise the network of drainage facilities that provide flood control during the minor storm events., Although land development has occurred adjacent to the major drainageway in the upper ponion of the basin, in general, limited improvements have been made along the main channel. The majority of the structures investigated in the Tri-Town Basin included roadlrailroadlcanal crossings and any significant detention storage, As part of this master planning effort, an inventory of the existing facilities associated with the major drainageway of each basin was conducted. The inventory and evaluation of each facility involved: (a) field reconnaissance to document location, condition and additional data requirements; (b) review of available design and as-built drawings; (c) collection of site-specific survey data; and (d) evaluation of the hydraulic capacity. Tables 3,1 and 3.2 summarize the results of the inventory and evaluation of the existing facilities. Sheet 1 presents the size and location of the inventoried existing drainage facilities. Specific information related to these facilities is provided in the following paragraphs. More detailed data and photographic documentation associated with each facility are provided in the project notebook submitted in conjunction with this report, 3.1 Detention Facilities Along the major drainageways, few detention facilities exist that provide effective reduction of peak discharges during minor and major storm events, The effective detention T:IOPENlCoweldO]lcoweldOJ fnl rpt.wpd 3.1 September 8, 1999