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45 David's Draw. The master plan for David's Draw calls for no improvement to the channel. The waterway would be flood plained only. Later, when development pressures occur, plans might be made for SOme modification of the outlet under Highway No. 93. However, the ponding is important just west of the Highway and consideration should be given to retaining the ponding area in the flood plain to keep downstream discharges minimized. SPECIAL COMMENTS ON CHANNEL PLANNING It is sometimes easier for the reader to fully understand the Master Plan Drawings if background information is presented which helps elucidate the planning decisions. The following paragraphs are presented with this in mi nd. Greqory Creek 1. The well-defined channel of Gregory Creek from Flagstaff Road to about College Avenue lends itself well to the flood plain zonIng concept rather than massive channel reconstruction. 2. The numerous driveway and road fills which have been improperly constructed across this upper channel reach have created signi- ficant flood problems, but these can be overcome with prudent re- construction of culverts and the addition of bridges. 3, The basic planning concept on Gregory Creek was to do only what was necessary to keep the water In the gulch and to reduce its tendency to follow the street system in an uncontrolled manner where it would cause maJor damage. 4. In final deslgn, some additional attention must be given to channel stability in the flood plalned reaches to Insure against erosion of the channe I. 5. The upper portion of Gregory Creek contains some reaches with heavy overgrowth of brush and some weak trees. Some c.learing and snagging Is necessary here to reduce the debris problem. This work can be undertaken without waiting for proJect con- struction. Clearing would not mean disturbing the natural armoring in any way. 6. Maintenance of the Gregory Creek streamside amenities can be accomplIshed with the chosen plan, which includes the high velocIty culvert In 7th Street. 7. The old channel of Gregory Creek downstream of 7th Street should be maintained for local drainage purposes and improved in some areas. The old channel should not be allowed to deteriorate any further, and issuance of building permits should be made carefully along this channel.