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available for conversion to flashboard structures and for the replacement of existing flashboard structures that are no longer functioning properly . Conversion to Low Volume Irrigation System Converting from high volume flood (or seepage) irrigation to low volume microirrigation conserves water improves water quality . With micro-irrigation , water is distributed through a network of underground pipe and above ground lateral tubing and applied directly to the soil above the plant's root zone . Modifications to existing microirrigation systems that can be expected to increase system efficiency and reduce offsite movement of nutrients , pesticides , and sediment are also eligible . Grade Stabilization This practice includes the use of structures , pipe , concrete , rock , vegetation , synthetic fabrics , and other materials to maintain the stability and , integrity of soils in ditches , swales , water furrows , and other erosion prone areas . This practice also includes equipment for chemical mowing of ditch banks to promote the proliferation of grasses through the exclusion of higher growing weeds and brush . On -Site Water Detention/Retention This practice will provide for the attenuation of both the rate and volume of off-site water and sediment discharge following heavy storm events . The water may be stored for future use or released off-site later at reduced discharge rates . Permanent Agrichemical Mixing/Rinsing Facility and/or Equipment Washdown facility This practice provides for the construction of a permanent facility to contain and recover spillage or rinsate from a fertilizer or pesticide mix and load area or from an equipment washdown site . It is intended to prevent fertilizer or pesticide contamination of ground or surface waters . The facility may include a concrete containment pad , pesticide storage building , sump/pump , rinsate tank , mixing tank , holding tank , and removable or permanent roof. Portable Agrichemical Mixing Station A portable device used in the field to prevent unintentional release of agrichemicals to the environment during mixing and loading of agrichemicals . The portable device must meet published standards and specifications ( USDA- NRCS Field Office Technical Guide — Interim Standard , Code 703) . The device can be used at more than one citrus grove . Precision Application Equipment Specialized equipment that allows nutrients and pesticides to be applied in a precise manner relative to the target of application . This includes sonic or optical sensors , devices that apply pesticides in a pre- defined , regulated manner, and equipment that uses GIS technology to allow application based on a pre-defined map . Precision application equipment often varies the rate of application , materials used , and location of application to achieve precise placement of the materials . Through this program , the department intends to cost share the precision elements of new equipment or retrofits to existing equipment that are needed to convert a non -precision spreader or sprayer into a precision spreader or sprayer. Water Table Observation Well This practice facilitates observation of the water table in a citrus grove and will help the manager to determine when groundwater Revised 03/21 /02 5