Water management presentation

water management presentation

Water, waste and Energy, management 4th International Congress

Plants growing in a fairly uniform soil will extract 40 of their moisture needs from the top of their root zone. If the soil depth is less than the managed crop root depth, then use the soil depth to determine the available water capacity of the soil. If the soil depth is greater than the managed crop root depth, the use the managed crop root depth to determine the available water capacity of the soil. Cnmp core curriculum 24 Irrigation Water Management Determining Volume of Water needed available water Capacity of soils (AWC) Speaker Notes: Explain that guidance on what the managed root zone is for different crops can be found in table 3-2 in the nrcs national Irrigation guide. Cnmp core curriculum 25 Irrigation Water Management Determining Volume of Water needed available water Capacity of soils (AWC) given: Silty Clay loam soil soil Depth 3 feet awc in/in from 0 to 24 inches of soil depth.10 in/in from 24 to 36 inches. Speaker Notes: This slide presents the soils and crop data needed to compute the total plant available soil water content for the crop being grown. Suggested learning Exercise: have the class compute the total available soil water content from the information given on this slide.

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Explain that the awc for a soil can be estimated using texture of the soil and Table 2-1 in the nrcs irrigation guide. Cnmp marketing core curriculum 21 Irrigation Water Management Determining Volume of Water needed available water Capacity of soils (AWC) Speaker Notes: Explain that a better estimation of available soil water (AWC) can be obtained from nrcs soil survey data. The physical soil properties table published in soil surveys contains information on awc. Most soil survey manuscripts are available on the website shown on this slide. Cnmp core curriculum 22 Irrigation Water Management Determining Volume of Water needed available water Capacity of soils (AWC) Speaker Notes: The most up-to-date soils information is available from the soil Data mart on the internet. The address for the soil Data mart website is shown on this slide. The reports generated on the soil Data mart website can be produced for just the soils the user is interested. This slide shows a report for the soil physical properties table which includes awc. Explain that if a cnmp is being developed the user is going to need the soil erosion factors on the table shown on this slide to address water and wind soil erosion issues. Cnmp core curriculum 23 Irrigation Water Management Determining Volume of Water needed available water Capacity of soils (AWC) What depth to use in computing awc? Speaker Notes: Discuss the need to consider the depth of soil vs the managed root depth of the crop being grown when determining the available water capacity to the crop.

Cnmp core curriculum 18 Irrigation Water Management Determining Volume of Water needed Net Irrigation Water Requirements (Fn contribution of Ground Water (GW) Speaker Notes: Discuss the need to consider the contribution of ground water when determining the net irrigation requirements. Guidance on determining the contribution from ground water can be found in the nrcs national Engineering Handbook, part 623, Chapter 2 Irrigation Water Requirements. Cnmp core curriculum 19 Irrigation Water Management Determining Volume of Water needed Net Irrigation Water Requirements (Fn ) Fn etc Aw pe gw - δsw where: ETc Crop evapotranspiration in inches Aw auxiliary water needs for leaching, temperature modification, crop quality in inches. Pe effective precipitation in inches gw estimated contribution from ground water in inches. Δsw change in soil water content for the period considered. Speaker Notes: Remind the students that the net Irrigation Requirement computation can be based on annual, monthly, or daily time periods and that published values with usually do not include auxiliary water needs, contributions from ground water or changes in soil water content. Cnmp core curriculum 20 Irrigation Water Management Determining Volume of Water needed available water Capacity of soils (AWC) Speaker Notes: Explain that the soil profile is the reservoir from which plants get water from so the available water capacity (AWC) of the soil must. The available water capacity (AWC) is the amount of water that a soil can store after all of the gravitational water has drained off and is usually expressed in inches per inch or inches per foot of soil depth.

water management presentation

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Ecaw is the electrical conductivity of the applied water used for leaching. Lr is the leaching requirement. Irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn auxiliary thesis water needs for Salinity management Aw parts etc (1/Lr 1) where: Aw auxiliary water needs for Salinity management in inches. ETc seasonal Crop evapotranspiration in inches. Lr leaching Requirement from Figure 2-33 of the nrcs national Engineering Handbook, part 623, Chapter 2 - irrigation Water Requirements. Speaker Notes: The formula for determining the amount of auxiliary water required salinity management is shown on this slide. If the seasonal crop evapotranspiration is 25 inches and the leaching requirement.2 the auxiliary water requirements would.25 inches. Ask the students when the auxiliary water requirement for salinity management should be Applied? Per irrigation At the beginning of the irrigation season At the end of the irrigation season After crop harvest Explain that applications of water for leaching salts should be applied after crop harvest to prevent leaching of other possible contaminants such as nitrates and other.

It is difficult to leach because the clay colloids are dispersed. Nonsaline-sodic soil This soil contains stalts that provide an ece of less than.0 mmho/cm and an esp of more than. Soil with these characteristics are commonly referred to as black alkali or slick spots. Irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn auxiliary water needs for Salinity management Speaker Notes: Explain that the figures 11-5, 6, and 7 of the Agricultural Waste management field Handbook provide a way to determine the amount of water. Figure 11-8 in the handbook can be used to determine the maximum amount of non diluted waste water that can be applied to soils without causing saline or sodic problems. Cnmp core curriculum 16, irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn auxiliary water needs for Salinity management Speaker Notes: Discuss how to determine the amount of irrigation water to be applied for leaching salts. Explain that figure 2-33 shown on the slide can be used to calculate the leaching requirement to prevent saline and/or sodic problems from occurring in the soil profile. ECt is the salt tolerance of the crop that can be determined from table 2-34.

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water management presentation

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Cnmp core curriculum 11, irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn ) Speaker Notes: Discuss that the nrcs has a computer program available at the link shown on the slide that is available for determining Irrigation Water Requirements. The program is available for downloading at the link shown on the slide. Cnmp core curriculum 12, irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn ) Speaker Notes: Discuss that local extension publications are often available that explain the irrigation water requirements for specific crops. An example of a extension publication for blueberry irrigation water requirements is shown on the slide. Irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn ) Crop evapotranspiration in Inches Jan Feb Mar put Apr may jun Jul Aug Sep Oct nov dec Corn Silage.00.22.17.13.91.14 Grass Pasture.46.31.53.24.22. Emphasize that auxiliary water needs, ground water contributions and changes in soil water content have not been considered. Crop Net Irrigation Water Requirements in Inches Jan Feb Mar Apr may jun Jul Aug Sep Oct nov dec Corn Silage.00.47.62.13.83.06 Grass Pasture.08.57.15.57.22.12.46.87 cnmp core curriculum 14, irrigation Water Management, determining.

Saline or sodic soils will cause poor seed germination and reduced yields. Additional water must be added to soils with a potential to have saline or sodic problems to leach excess salts. Where the soluble salt content of wastewater is high enough to cause problems, the wastewater must be diluted with good quality water or applications must be limited. Speaker Notes: Discuss the need to increase the net irrigation requirement for leaching excess salts. Saline soil This soil contains salts that provide an electrical conductivity of the soil-water extract, ece of mor than.0 mmho/cm, and an exchangeable sodium percentage (ESP) of less than. The principal anions are cloride, sulfate, small amounts of bicarbonate, and occasionally some nitrate. Saline-sodic soil This soil contains salts that provide an ece of more than.0 mmhos/cm and an esp or more than.

Evaluation of the Irrigation System should be done during the inventory process to develop the cnmp or for the design and application of irrigation water management as a single practice. Environmental Considerations are addressed during the inventory process for applying irrigation water management and are related to water quality, cultural resources and endangered plants and animals. Irrigation Water Management, determining Volume of Water needed Speaker Notes: This slide introduces section on how to determine the amount of water needed. Cnmp core curriculum 8, irrigation Water Management, determining Volume of Water needed Crop Consumptive use (CU) The amount of water used by the crop in transpiration and building of plant tissue, and that evaporated from adjacent soil or intercepted by plant foliage. It is expressed as depth in inches or as volume in acre inches per acre. It can represent the daily, design, monthly, or seasonal quantity of water needed for plant growth.


Often referred to as Crop evapotranspiration (ETc ). Speaker Notes: Discuss the definition of Crop Consumptive use (CU) as presented on this slide. Irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn ) Crop evapotranspiration (ETc ). Auxiliary water needs such as leaching, temperature modification and crop quality (Aw ). Effective precipitation (Pe ). Change in soil water content for the period of consideration (ΔSW). Speaker Notes: Discuss the components of Net Irrigation Water Requirements as presented on this slide. Cnmp core curriculum 10, irrigation Water Management, determining Volume of Water needed Net Irrigation Water Requirements (Fn ) Speaker Notes: Discuss the information needed to determine the net Irrigation Requirements for different crops are contained in the nrcs national Engineering Handbook, part 652, Irrigation guide. Mention that these documents are available online at the link shown on the slide.

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Volume of owl Water needed per Irrigation and for the season. Application rate of irrigation water. Records Showing Date and Amount of Water Applied. Include type of irrigation scheduling technique used by the client. Evaluation of the Irrigation System Environmental Considerations Speaker Notes: Discuss the minimum documentation requirements for Irrigation Water Management taken from the Statement of Work- crops to be Grown, Cropping Sequence and soils Information is to be obtained during the inventory process of developing the cnmp. Volume of Water needed per Irrigation and for the season can also be obtained during the inventory process of developing the cnmp if there is good documentation available for the design of the irrigation system. Records Showing Date and Amount of Water Applied shredder including the type of irrigation scheduling technique used by irrigator. If available this information will also be obtained during the inventory process of developing the cnmp. If this information is not available a record keeping system for irrigation scheduling will have to be developed for the landowner/operator.

water management presentation

It is important to obtain the current state standard to know what death the minimum level of acceptable quality of planning, design, installation, operation and maintenance is needed for Irrigation Water Management. Irrigation Water Management, speaker Notes: Present the nrcs statement of work for Irrigation Water Management shown on this slide that the students should have in their handouts. Explain that nrcs statements of work establish the minimum deliverables for the design, Installation, and Checkout of conservation practices. The statements of work also provide a list of references that explain nrcs policy regarding the design, Installation, and Checkout of conservation practices. Explain that each state will use the national nrcs statement of work as a template to develop a statement of work to be used in the state. The state version of the statement of work may be exactly the same as the national standard or contain additional information. It is important to obtain the current statement of work for the state to know what the minimum deliverables are for the design, Installation and Checkout of Irrigation Water Management. Cnmp core curriculum 6, irrigation Water Management, minimum Documentation: Crops to be Grown, Cropping Sequence and soils Information.

is important when developing resource management plans. Cnmp core curriculum 4, irrigation Water Management, speaker Notes: Present the national nrcs conservation practice standard for Irrigation Water Management shown on this slide that the students should have in their handout materials. Explain that nrcs conservation practice standards establish the minimum level of acceptable quality of planning, designing, installing, operating and maintaining conservation practices. Explain that each state will use the national nrcs conservation practice standard as a template to develop a standard to be used in the state. The state standard may be exactly the same as the national standard or contain additional information.

Irrigation system efficiency and acres irrigated. At the end of london the presentation have the students calculate total available soil water capacity, net irrigation water requirement, irrigation frequency, gross irrigation requirement and the required flowrate needed using the information provided. Cnmp core curriculum 2, irrigation Water Management, irrigation Water Management is the process of determining and controlling the volume, frequency, and application rate of irrigation water in a planned, efficient manner. Speaker Notes: Present the definition of Irrigation Water Management shown on this slide to the students. Cnmp core curriculum. Irrigation Water Management, why is Irrigation Water Management Important? Manage soil moisture to promote desired crop response.

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1, irrigation Water Management, speaker Notes: The student should become familiar with the basic concepts of irrigation water management and what is required for documentation. Required course materials: United States Department of Agriculture - natural Resources Conservation Service national Engineering year Handbook, part 652, Irrigation guide, chapter 9, Irrigation Water Management. Available at: Accessed United States Department of Agriculture - natural Resources Conservation Service national Statement of Work for Irrigation Water Management, washington,. Available at: Accessed Supplemental Resources: Local Irrigation District Water Management Plans and Irrigation guides. United States Department of Agriculture - natural Resources Conservation Service national Engineering Handbook, part 652, Irrigation guide, washington,. Available at: Accessed United States Department of Agriculture - natural Resources Conservation Service national Engineering Handbook, part 623, Irrigation, section 15, Chapters 1 through 12, washington,. Available at: Accessed Suggested learning Exercise: Provide the following information : soil Name and physical soil properties table. Crop name, effective rooting depth, managed allowed deficit, and peak irrigation water requirement.


Water management presentation
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