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I I I I I I I I I I I I I I I I I I I 5, The channels are also affected by ~rrigation ditches and rail- roads, but to a lesser degree than by the streets. The Agricul- tural Ditch crosses Dry Gulch near Simms Street, and intercepts a portion of the drainage runoff from upstream of it. It then carries the flow out of the basin to the south. The Rocky Moun- tain Ditch crosses North Dry Gulch at Dover and Dry Gulch near Garrison. It collects flows in the North Dry Gulch channel and conveys them to the Dry Gulch Channel. At that point, a side spillway dumps a portion into Dry Gulch. The Associated Rail- road runs parallel to Dry Gulch for much of its length, and forms a ridge or divide similar to streets. This has a significant effect on the flooding at certain locations. land use is generally residential except for the large shopping centers near Pierce Street and Miller Street. The master plan- ning presented in this report is based upon future or "fully developed" land use conditions. These anticipated conditions are relatively close to those existing at present, except that the residential development is expected to become somewhat higher in density. As the streets, ditches, and railroad gradually obscured the chan- nel, builders and developers began to extend the already under- sized culverts, fill the channels, and erect structures where the channel had been. The development further obscured the chan- nels, and the present condition was reached, such that persons unfamiliar with drainage may not even be aware of the potential flood danger 0 In several locations, structures have been built so close to the channel that they not only are in a hazardous location themselves, but create constrictions of channels which pose hazards to adjacent properties. The land use within one block on each side of Colfax Avenue is predominantly commercial. Outside this "Colfax Corridor" the