To avoid seepage along the pipe, concrete collars, 200mm wide are built around the pipe in the trench every 5 meters. The trench 1000mm wide for the draw-off pipe should be at least one meter below the construction working surface.
#Irrigation system designer manual#
Adapted from Practice Manual for Small Dams, Pans and Other Water ConservationĪdopting n=10%, D=100mm V=0.7 m/s = 2 = 0.022 2 × 0.1 × × 0.1 × 0.7 = 0.5 = 500Īdopt Cast Iron Pipe outlet pipe, diameter 100mm with perforations along a length of 500mm. Minimum flow velocities (0.6 m/s) and minimum size of pipe (50 mm dia.) for selfcleansing. Min pipe diameter 100mm to prevent blockage in order to decrease the risk of the Pipe getting blocked by debris or silt. The following considerations were adapted from Practice Manual for Small Dams, Pans and Other Water Conservation Structures in Kenya. Despite several attempts to vary (D) and position of the sluice gate by reducing the value of (h) no reasonable (B) was obtained this can be attributed to the low scheme water requirement.Īlternative 2: Outlet pipe beneath dam wall. Design considerations.ĭesign Discharge(Q) 0.022m 3 /s. The point that provide least canal length to the farm head. The lowest elevation of the dam to ensure gravity flow. The main criteria used to locate a suitable location were This section attempts to design for the most suitable off take and provide the design drawings.
A siphon pipe (where no outlet pipe was laid during construction). The most common options for extracting water for irrigation from earth dams are Direct extraction. X According to Water from pans ponds and dams. Dispose of the drainage water responsibly to a sink in case of high salt levels. Soil salinity Managing the salt balance in the irrigated soils will be provided by adequate drainage. Waterlogging Good irrigation management, especially at the field level will be implemented to minimize water application losses and an adequate drainage system provided. However, labor for land preparation prior to cultivation will be required. Project Scheme.įurrow irrigation scheme is adopted since there is no wastage of land in construction of field ditches, it is suitable for maize which is easily injured by excess water, less land surface is covered with water therefore reducing pudding and crusting of soil in addition to reduction of evaporation losses. Sedimentation tank will be provided to avoid the effects of sediment load in the system.
The canal will be lined with clay to curb the high infiltration rate of nitisol soils and increase conveyance efficiency.
#Irrigation system designer serial#
("Maize | Infonet Biovision Home.," n.d.) Serial Parameter Engineering works.Īn appropriate offtake structure will be evaluated and designed to divert water from the sand dam to a main canal. The depth of planting is commonly 3-6 cm, depending on soil conditions and temperatures. It is important for the farmers in this region (Nyamira North Sub County) to apply manure or compost regularly to maintain and sustain the organic matter content (National Soil Fertility Test Results, 2014. However, the steep slopes will necessitate excessive land levelling and consequently loss of the top soil by erosion. Seeing as it is a shallow-rooted row crop to be grown in an area with well-drained nitisol, furrow irrigation is more suitable. The proposed crop for the project is hybrid maize variety H516 to be grown in the first rainy season (October plantings) by monocropping for maximum yields. Slight compaction of soil during land preparation can reduce the initial high infiltration rate. This rate falls to a residual value of 7.6mm/hr. Despite high clay content of 50-60% throughout, the deep soil feels and handles like loam *The soils have high infiltration rate as high as 153mm/hr after one hour. Topography.Įlevation of farm head is approximately 1800m.Soils of the proposed irrigation land area are classified as UhI+1 Well drained, very deep to extremely deep of slopes 2-16% and commonly referred to as Red Coffee Soil. (http:/inventory-of-dams-and-pans-in-ke). The area infrastructure is developed high and reliable power supply being attributed to high tea production in the constituency.
The proposed land is 20Km from Nyamira town and can be easily accessed via Sotik IKonge road (C21). The projected is intended to cover 10hactares of land in Kitaru area, North Mugirango constituency in Nyamira County.
0 kommentar(er)
