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Figure, 1.-Location of monitoring sites and general features. Approach An urban-hydrology monitoring site consists of several types of instrumentation. This instrumentation includes rainfall-measuring equipment, various stage and discharge-meauring devices, water-quality-sampling equipment, atmospheric-deposition sampler, input-output digital recorder, and the system control unit. Rainfall-measuring equipment is of two types-the tipping-bucket rain gage and the 3-inch pipe gage equipped with a float and digital recorder. The tipping-bucket rain gages which are not located at the monitoring site, are connected to the system control unit via telephone lines. Pipe gages only are used at the Rooney Gulch site, due to the lack of telephone lines.

Runoff characteristics and washoff loads from rainfall-simulation experiments on a street surface and a native pasture in the Denver metropolitan area, Colorado.

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Plate 1. Map showing location of monitoring stations, rain gages, and observation wells in the drainage basins and subbasins of Chatfield and Cherry Creek Lakes, Denver metropolitan area, Colorado