Estimate from the County of Welland to S.D. Woodruff for engineering services in marsh lands drainage for 1 year

Estimate from the County of Welland to S.D. Woodruff for engineering services in marsh lands drainage for 1 year, Dec. 1857.

Engineer services in the marsh lands drainage to the 28th of April inclusive to Frederick Holmes, Louis Clement and Thomas Baird

Engineer services in the marsh lands drainage to the 28th of April inclusive to Frederick Holmes, Louis Clement and Thomas Baird. Signed by S.D. Woodruff, April 28, 1855.

Engineer services in the marsh lands drainage to the 29th day of August inclusive to Frederick Holmes, Thomas Baird and Thomas Gilleland

Engineer services in the marsh lands drainage to the 29th day of August inclusive to Frederick Holmes, Thomas Baird and Thomas Gilleland. Signed by S.D. Woodruff, Aug. 31, 1855.

Engineer services in the marsh lands drainage to the 29th day of August inclusive to Frederick Holmes, Thomas Baird and Thomas Gilleland, signed by S.W. Woodruff

Engineer services in the marsh lands drainage to the 29th day of August inclusive to Frederick Holmes, Thomas Baird and Thomas Gilleland, signed by S.W. Woodruff. This copy contains a note to Fred Holmes from S.D. Woodruff, Sept. 11, 1855.

Engineer services in the marsh lands drainage for the months of December, 1855 and January, February and March of 1856.

Engineer services in the marsh lands drainage for the months of December, 1855 and January, February and March of 1856. Signed by S.D. Woodruff, March 31, 1856.

Engineer services in the marsh lands drainage for the months of December, 1855 and January, February and March of 1856 to Frederick Holmes and Joseph Simpson

Engineer services in the marsh lands drainage for the months of December, 1855 and January, February and March of 1856 to Frederick Holmes and Joseph Simpson. Signed by S.D. Woodruff, April 1, 1856.

Engineer services in marsh lands drainage for the months of April, May and June, 1856 to Fred Holmes, Joseph Simpson and Thomas Baird

Engineer services in marsh lands drainage for the months of April, May and June, 1856 to Fred Holmes, Joseph Simpson and Thomas Baird. Signed by S.D. Woodruff, June 30, 1856.

Engineer services in marsh lands drainage for the months of July, August and September, 1856 to Fred Holmes, Joseph Simpson, Thomas Baird and Rose Osborne

Engineer services in marsh lands drainage for the months of July, August and September, 1856 to Fred Holmes, Joseph Simpson, Thomas Baird and Rose Osborne. This is signed by S.D. Woodruff, Oct. 1, 1856.

Engineering services in marsh lands drainage for the months of October, November and December

Engineering services in marsh lands drainage for the months of October, November and December. This is signed by S.D. Woodruff, Dec. 31, 1856.

Engineering services in marsh lands drainage for the months of January, February, March and April for Fred Holmes, Joseph Simpson, D. Davidson, Rose Osborne, Henry Wilson and William Baird

Engineering services in marsh lands drainage for the months of January, February, March and April for Fred Holmes, Joseph Simpson, D. Davidson, Rose Osborne, Henry Wilson and William Baird. This is signed by S.D. Woodruff, May 1, 1857.

Engineering services in marsh lands drainage for the months of May, June, July and August 1857 for Fred Holmes, Joseph Simpson and William Baird

Engineering services in marsh lands drainage for the months of May, June, July and August 1857 for Fred Holmes, Joseph Simpson and William Baird. This is signed by S.D. Woodruff, Aug. 31, 1857.

Salt marsh morphodynamics: An investigation of tidal flows and marsh channel equilibrium

Although numerous field studies have evaluated flow and transport processes in salt marsh channels, the overall role of channels in delivering and removing material from salt marsh platforms is still poorly characterised. In this paper, we consider this issue based on a numerical hydrodynamic model for a prototype marsh system and on a field survey of the cross-sectional geometry of a marsh channel network. Results of the numerical simulations indicate that the channel transfers approximately three times the volume of water that would be estimated from mass balance considerations alone. Marsh platform roughness exerts a significant influence on the partitioning of discharge between the channel and the marsh platform edge, alters flow patterns on the marsh platform due to its effects on channel-to-platform transfer and also controls the timing of peak discharge relative to marsh-edge overtopping. Although peak channel discharges and velocities are associated with the flood tide and marsh inundation, a larger volume of water is transferred by the channel during ebb flows, a portion of which transfer takes place after the tidal height is below the marsh platform. Detailed surveys of the marsh channels crossing a series of transects at Upper Stiffkey Marsh, north Norfolk, England, show that the total channel cross-sectional area increases linearly with catchment area in the inner part of the marsh, which is consistent with the increase in shoreward tidal prism removed by the channels. Toward the marsh edge, however, a deficit in the total cross-sectional area develops, suggesting that discharge partitioning between the marsh channels and the marsh platform edge may also be expressed in the morphology of marsh channel systems.