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GpLpRAbp <br /> Colorado Water <br /> Conservation Board <br /> DuWj,cr, rn of Nawrai n­«s <br /> Last Updated: June 2020 <br /> Task 3 -Establishment of grass reference crop ETo plot(Objective 1.b) <br /> Description of Task: <br /> IIC HQ needs on-site monitoring of grass reference crop ET(ETo) for estimation of local crop consumptive <br /> water use(ET,7).The American Society of Civil Engineers (ASCE,2005)recommends that an automatic <br /> weather station (AWS)used for calculating ETo be located in the middle of a field with irrigated vegetation, <br /> such as clipped grass.Given that the intended ETo plot at IIC HQ will be surrounded by other irrigated fields, <br /> it is estimated that around 0.5 acre of irrigated clipped grass will be adequate to surround an AWS that will be <br /> used for ETo calculations.A solid set sprinkler system will be installed to establish and irrigate the 0.5-acre <br /> grass reference plot. <br /> ASCE-EWRI. (2005).The ASCE Standardized Reference Evapotranspiration Equation. Report 0-7844-0805-X, <br /> ASCE Task Committee on Standardization of Reference Evapotranspiration.Reston,Va.:American <br /> Soc.Civil Engineers. <br /> Method/Procedure: <br /> A solid set sprinkler irrigation system(donated by Toro Company;see Exhibit C pages 14-15)will be installed <br /> on 0.5 acres of land. A sprinkler irrigation contractor will be hired to install the system.Approximately 4,500 <br /> linear feet of 1-inch PVC pipes will be installed to convey pressurized water from the booster pump (Task 2) <br /> to the ETo plot.Flow sensors and an irrigation controller will be installed for smart scheduling of irrigations. <br /> A sprinkler line blow out assembly will be installed for flushing and winterization.After the solid set <br /> sprinkler system is installed,grass seed will be planted on the field.An existing AWS will be transferred to the <br /> middle of the grass plot for automated monitoring of solar radiation,air temperature,relative humidity,and <br /> wind speed that are required for calculation of hourly(mm/h)and daily(mm/d)ASCE standardized ETo. <br /> Deliverable: <br /> • Solid set sprinkler system for irrigating a 0.5-acre grass reference plot <br /> • Grass reference (ETo)plot for monitoring weather variables required for calculating hourly and daily <br /> ETo. <br /> • Report of irrigation system operation <br /> Task 4-Installation of mainline and concrete pad for VRI center pivot(Objective 1.c) <br /> Description of Task: <br /> CSU/IIC will work with Aqua Engineering Inc.to install a mainline that conveys water from the booster pump <br /> to the VRI center pivot.A concrete pad will also be installed at the point of connection. <br /> Method/Procedure: <br /> CWP Grant Application 113 <br />