![]() ![]() Other technical personnel from Federal, State, private, and local agencies will also find the chapter very useful as a basic reference when providing technical assistance relating to irrigation water requirements. It is written for employees of the Soil Conservation Service who provide technical assistance to the water user with concerns for both water quantity and water quality. Chapter 2 of Part 623 is a new chapter to the family of chapters currently in NEH Section 15, Irrigation. This chapter provides the processes for determining irrigation water requirements for state and local irrigation guides. The processes include evaluation of crop water use, climatic relationship and data, reference crop evapotranspiration, crop coefficients, leaching requirements for salinity control, temperature control and other auxiliary water requirements, effective precipitation, water table contribution, irrigation efficiencies, on-farm irrigation requirements, and project irrigation requirements. Water-collecting & escape ditches are built in groves and, as a rule, with trapezoidal section. For the complete system to work well, each must work conjunctively toward the common goal of promoting maximum on-farm production. Chapter 2 describes the processes that affect water use requirements for a crop, field, farm, group of farms, or project level evaluation. The surface irrigation system and some of its features may be divided into the following four component systems: (1) water supply, (2) water conveyance or delivery, (3) water use, and (4) drainage. The specific procedure or equation used depends on the availability of specific climatic data needed for that process and the desirable intensity level of managing irrigation water. Determine the water conveyance efficiency water application efficiency. It provides nationwide acceptable procedures to determine crop water needs. The following data were obtained in determining the soil moisture content at. This chapter of the SCS National Engineering Handbook (NEH) provides that current technology. Field evaluations and ground truthing must always be used to further refine the estimates used for planning irrigation systems. Support for many of the estimated values included in this chapter come from field research and many field evaluations over many years. ![]() ![]() Todays management of irrigation water requires using the best estimate that current technology can provide for the determination of crop water use and field irrigation water requirements. The importance of irrigated crops is extremely vital to the public's subsistence. Competition for a limited water supply for other uses by the public require the irrigation water user to provide much closer control than ever before. The complete management of irrigation water by the user is a necessary activity in our existence as a society. Supplemental irrigation is also vital to produce acceptable quality and yield of crops on croplands in semi-arid and subhumid climates during seasonal droughty periods. Irrigation is vital to produce acceptable quality and yield of crops on arid climate croplands. ![]()
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