When planning a surface irrigation system Periodic checks and removal of debris employing an above ground, multi-outlet, as necessary from trash racks and structures distribution pipeline the following should be to assure proper operation. considered: Periodic removal and planned Provisions should be made for thrust placement of sediment from traps and/or control at locations subject to pipe storage facilities to maintain design capacity movement. and efficiency. Good grade control along the pipeline and Inspection and testing of all pipeline and along the rows is needed to assure pumping plant components and uniform water distribution. appurtenances. Consider the water source and potential Routine maintenance of all mechanical trash types and amounts when designing components in accordance with the or selecting inlet screen types and sizes. manufacturer’s recommendations. Plan for disposal of used poly irrigation Periodic land smoothing or grading of tubing and encourage recycling. surface irrigated fields required to maintain the design in the direction of flow. Anchor poly irrigation tubing when may cause it to move. Additionally for a subsurface irrigation, the plan include, as a minimum: PVC Gated pipe with wall thickness less than 0.12 inch will be more flexible making Water control structure elevation settings soil support and uniform pipe grade more by date required to maintain water table at important if an irrigation stream contains design depth. sand. Sand will tend to settle and Critical dates and water table target accumulate in any gated pipe lows. elevations during planned crop growing season. Inclusion of specification and locations of Plans and specifications for surface and all required groundwater observation wells. subsurface irrigation systems shall be in keeping with this standard and shall describe REFERENCES the requirements for applying this practice to achieve its intended purpose. USDA-NRCS, National Engineering Handbook, Part 623, Irrigation. OPERATION MAINTENANCE USDA-NRCS, National Engineering An operation and maintenance plan specific to Handbook, Part 624, Drainage. the facilities installed shall be prepared for use by the landowner or operator responsible for USDA-NRCS, National Engineering operation and maintenance. The plan should Handbook, Part 636, Chapter 52, Structural provide specific instructions for operating and Design of Flexible Conduits. maintaining facilities to ensure they function properly. The plan shall include provisions to USDA-NRCS, National Engineering address the following: Handbook, Part 650, Engineering Field Periodic cleaning and regrading of Handbook, Chapter 14, Water Management tailwater collection facilities to maintain proper (Drainage). drainage, capacity, and functionality. USDA-NRCS, National Engineering Handbook, Part 652, National Irrigation Guide.
When planning a surface irrigation system employing an above ground, multi-outlet, distribution pipeline the following should be considered: Provisions should be made for thrust control at locations subject to pipe movement. Good grade control along the pipeline and along the rows is needed to assure uniform water distribution. Consider the water source and potential trash types and amounts when designing or selecting inlet screen types and sizes. Plan for disposal of used poly irrigation tubing and encourage recycling. Anchor poly irrigation tubing when may cause it to move. PVC Gated pipe with wall thickness less than 0.12 inch will be more flexible making soil support and uniform pipe grade more important if an irrigation stream contains sand. Sand will tend to settle and accumulate in any gated pipe lows. Plans and specifications for surface and subsurface irrigation systems shall be in keeping with this standard and shall describe the requirements for applying this practice to achieve its intended purpose. OPERATION MAINTENANCE An operation and maintenance plan specific to the facilities installed shall be prepared for use by the landowner or operator responsible for operation and maintenance. The plan should provide specific instructions for operating and maintaining facilities to ensure they function properly. The plan shall include provisions to address the following: Periodic cleaning and regrading of tailwater collection facilities to maintain proper drainage, capacity, and functionality. Periodic checks and removal of debris as necessary from trash racks and structures to assure proper operation. Periodic removal and planned placement of sediment from traps and/or storage facilities to maintain design capacity and efficiency. Inspection and testing of all pipeline and pumping plant components and appurtenances. Routine maintenance of all mechanical components in accordance with the manufacturer’s recommendations. Periodic land smoothing or grading of surface irrigated fields required to maintain the design in the direction of flow. Additionally for a subsurface irrigation, the plan include, as a minimum: Water control structure elevation settings by date required to maintain water table at design depth. Critical dates and water table target elevations during planned crop growing season. Inclusion of specification and locations of all required groundwater observation wells. REFERENCES USDA-NRCS, National Engineering Handbook, Part 623, Irrigation. USDA-NRCS, National Engineering Handbook, Part 624, Drainage. USDA-NRCS, National Engineering Handbook, Part 636, Chapter 52, Structural Design of Flexible Conduits. USDA-NRCS, National Engineering Handbook, Part 650, Engineering Field Handbook, Chapter 14, Water Management (Drainage). USDA-NRCS, National Engineering Handbook, Part 652, National Irrigation Guide.
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