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, ~~ <br />~ Flood Control District in 1985, is a special case. It is a <br />combination of a minimum maintenance alignment and more heavily <br />protected channel that in some reaches differs from the minimum <br />maintenance alignment requirements. The Master Plan alignment <br />was developed in order to satisfy many constraints including: <br />(1) the minimum maintenance alignment requirements, (2) pro- <br />party boundaries, (3) location of the existing river, and (4) <br />proposed improvements by the County and gravel operators. The <br />Phase B Master Plan clearly defines the horizontal alignment of <br />the channel, the required invert profile of the channel in its <br />ultimate configuration and methods of bank protection proposed <br />along the entire river. This alignment can be changed if it is <br />technically demonstrated that the change is consistent with the <br />intent of the Master Plan as approved by the District. <br />2.1.3 Minimum Maintenance Alignment <br />This alignment is intended to be used only when the operator <br />can demonstrate that a change will benefit the extraction ope- <br />ration and still comply with the intent of the Master Plan <br />alignment. <br />Studies by the District have resulted in a recommended river <br />alignment that is expected to require significantly less main- <br />tenance to retain the river's lateral stability. The config- <br />uration of the channel cross section and geometric properties <br />of "minimum maintenance alignment" channel are illustrated on <br />Figure 2.1 and have the following characteristics: <br />FN = 400 to 1,500 feet <br />~ - R/60 + 50° <br />B = 250 feet <br />L - 300 to 700 feet <br />La /B = 7 to 15 <br />UDSFCD GRAVEL GUIDELINES 12/17/87 <br />2-2 <br />