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<br />, <br />I <br />I <br />I <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br />I <br /> <br />II. <br /> <br />III. <br /> <br />GRANGE HALL CREEK <br />MAJOR DRAINAGEWAY PLANNING STUDY <br />PHASE B REPORT <br /> <br />TABLE OF CONTENTS <br /> <br />SyNOPSiS................ ....................... ....0............................... <br /> <br />I. <br /> <br />INTRODUCTION................................................................. <br /> <br />A. Author izat ion................................. ...... ....................... <br /> <br />B. Purpose and Scope........................................................ <br /> <br />C. Mapping and Surveys.................................................... <br /> <br />D. Acknawledgments............ .................... ................. ....... <br /> <br />GENERAL STUDY AREA DESCRiPTION............................... <br /> <br />A. Study Area.................................................................. <br /> <br />B. Hi stary........................................................................ <br /> <br />C. T apographic and Geophysical Features........................... <br /> <br />D. Present Land Use......................................................... <br /> <br />E. Future Land Uses......................................................... <br /> <br />HYDROLOG IC ANALySiS...................... .............................. <br /> <br />A. Genera I....................................................................... <br /> <br />B. Major Sub-bas ins......................................................... <br /> <br />I. Grange Hall Creek.............................................. <br /> <br />2. Tributary S......................................................... <br /> <br />3. Tributary NE...................................................... <br /> <br />4. Tributary N........................................................ <br /> <br />5. Tributary SE....................................................... <br /> <br />6. Undefined Tributary............................................ <br /> <br />Page <br /> <br />C. Basin Hydrology.......................................................... <br /> <br />I. Sub-basin Characteristics.................................... <br /> <br />2. Design Rainfall................................................... <br /> <br />3. Storm Runoff and Hydrographs............................ <br /> <br />D. Flood Routing............................................................. <br /> <br />E. Floodway Determination.............................................. <br /> <br />F. Erosi on............... ..... ....... .................... ............... ......... <br /> <br />IV. <br /> <br />G. Groundwater Recharge. .......... .11.. ............. ......... .......... <br /> <br />MAJOR DRAINAGEW A Y IMPHOVEMENTS........................... <br /> <br />A. Genera I......,.. ...................... ................. .......... ............ <br /> <br />8. Design Cri teria........................................................... <br /> <br />I. Open Channels.................................................... <br /> <br />2. Closed Conduits.................................................. <br /> <br />3. Spi Ilways............................................................ <br /> <br />4. Detention Faci lities............................................ <br /> <br />C. Construction Sequence................,......,........................ <br /> <br />D. Operations and Maintenance......................................... <br /> <br />E. Description of Moster Plan Drawings............................ <br /> <br />I. Drawing GH-I.................................................... <br /> <br />2. Drowing GH-2.................................................... <br /> <br />3. Drawing GH-3..................................................... <br /> <br />4. Drawing GH-4................. ... ................................. <br /> <br />5. Drawing GH-5..................................................... <br /> <br />6. Drawi ng GH-6........................... .......................... <br /> <br />7. Drawing GH-7..................................................... <br /> <br />8. Drawing GH-8.............. ................................ ....... <br />