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.

Chart of land drainage for the Welland Canal final estimate of work done on sections no.1, 2 and 3

Chart of land drainage for the Welland Canal final estimate of work done on sections no.1, 2 and 3 on the road below lock no. 2 leading to Port Dalhousie. Work commenced Nov. 1846 and finished July 1847. Road work and the waste weir no.1 to Port Dalhousie work commenced Aug. 1847 and finished Sept. 1847, Nov.1, 1847.

Drainage: l´art de tracer et d´etablir les drains

UANL

Evolution of Chaliyar River Drainage Basin: Insights from Tectonic Geomorphology

Drainage basins are durable geomorphic features that provide insights into the long term evolution of the landscape. River basin geometry develop response to the nature and distribution of uplift and subsidence, the spatial arrangement of lineaments (faults and joints), the relative resistance of different rock types and to climatically influenced hydrological parameters . For developing a drainage basin evolution history, it is necessary to understand physiography, drainage patterns, geomorphic features and its structural control and erosion status. The present study records evidences for active tectonic activities which were found to be responsible for the present day geomorphic set up of the study area since the Western Ghat evolution. A model was developed to explain the evolution of Chaliar River drainage basin based on detailed interpretation of morphometry and genesis of landforms with special emphasis on tectonic geomorphic indices and markers.

Drainage, salt leaching and physico-chemical properties of irrigated man-made terrace soils in a mountain oasis of northern Oman

Little is known about the sustainability of irrigated oasis agriculture in northern Oman. The objective of this study therefore was to examine which factors allowed agricultural productivity to be apparently maintained during the two millenia of a mountain oasis’ existence. Soil moisture and physico-chemical properties were measured in a typical flood-irrigated field sown to alfalfa (Medicago sativa L.). Particle size, organic (C_org) and inorganic carbon content, pH and electrical conductivity (EC)of the soil profile were analyzed at 0.15, 0.45 and 1.00 m. Saturated hydraulic conductivity and the soil’s apparent bulk density and water potential were determined from undisturbed samples at 0.05, 0.25 and 0.60 m. During irrigation cycles of 6–9 days, volumetric water contents ranged from 30% to 13%. A tracer experiment with potassium bromide revealed that 52–56% of the irrigation water was stored in the upper 0.4 m of the soil. The rest of the water moved further down the profile, thus providing the necessary drainage to avoid the build-up of toxic salt concentrations. Due to differences in pore size, plant-available water in the topsoil amounted to 18.7% compared to 13% and 13.5% at 0.25- and 0.60-m depth, respectively. The aggregate structure in the upper 1.0 m of the profile is likely preserved by concentrations of calcium carbonate (CaCO3) from 379 to 434 mg kg^-1 and C_org from 157 to 368 mg kg^-1 soil. The data indicate that the sustainability of this irrigated landuse system is due to high water quality with low sodium but high CaCO3 concentration, the elaborate terrace structure and water management which allows adequate drainage.