Report On Investigation of Levees Bank Revetment Dams Etc
Report On Investigation of Levees Bank Revetment Dams Etc
R M Elder
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3) Jasanry and riprap. 4) Pilee (both round and sheet) 6) Fascine mattresses . 6) Lumber jnattreesee . } Spur dikes . (P 2) If the eroding of the natural minor bed banJte can be c-con- omicially stopped, a natural consequence will be the salvation of orach of the levee proper, which is now lost annually, regardless of exten- sive floods, thrjUf-h the supporting bank being eaten away by current action. (P It ie estimated that the annual erosion of the banks of the Mississippi r. Ivcr below Gniro... am unto to the equivalent of ten square mllec eighty-six foet deon. On this basis the river annually carries away land (if a value of fftO*00 per acre be aseuraed) worth over . (P 4) The erosion of this vast amount of material causes added expense in the endeavor to keep a navigable channel open, ns the material eroded from the banks in one place ie deposited in the lower resents of the river tmd tonde to silt up tho channel, thus causing additional dredging . (P 5) The conclusions reached by Tho-na ft Watt in connection with bank revetment aro as follows : 6) "The object of bank revetment is to protect the banks of the river from destruction by the currents.
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