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~IH.~c;'f~O ~~AN The plan which has been developed ~or each study reach. considers the erosive ~orces o~ the river; incorporates existing diking and ~lood control structures; provides a minimum 10-year ~lood protection along the le~t (south) bank o~ the studY reach and 100-year ~lood protection along the right (north) bank o~ the study reach ~rom river station 383.20 to station 384.00 and 10 to 50 year ~lood protection ~rom river station 382.20 to station 383.20; reduces annual channel and overbank maintenance costs: and. meets Federal and State design standards. Typical designs have been prepared ~or the project ~eatures which are shown on exhibits to A description o~ the project elements by reach is as ~ollows: Reach 1 During the ~loodlng o~ 1984. the north bank o~ the river eroded back 150 to 200 ~eet causing rlows In the existing channel to slow down and deposit large amounts o~ sand and gravel ~orming a gravel bar. This gravel bar extends ~rom river station 382.60 to station 383.10 and is over 100 reet wide in places and as much as 4 ~eet high above the present water sur~ace. This gravel bar should be removed to encourage the river to return to the old channe I . Reach 2 The right (north) bank o~ the river in this area has eroded to within 75 ~eet o~ the new Redlands Parkway. I~ nothing is done. the river will erode into the Parkway itsel~. It is proposed to place rock jetties along this reach o~ river to ~orce the ~low away ~rom the north bank. These Jetties will stabilize the stream bank throughout the reach. the rock Reach 3 A dike created by a gravel extraction ooeratlon eroded away during the recent ~looding. Stabilization o~ the channel consists or replacing this dike and armorlng the river side with large rip-rap material throughout the length. This dike will help direct the river away ~rom the newly constructed Redlands Parkway and keep it in Its original channel. Reach 4 At present there Is a Sharp point on the north bank o~ the river which was constructed during a gravel mining operation. This point directs the ~low o~ the river into the Audubon and Connected Lakes Park property on the south side o~ the river. The proposed Improvement is to move this point back and smooth the bend In the river using exlsiting materials. thus eliminating the direct de~lectlon or rlood forces onto the south bank o~ the river.