Comprehensive semestral report for field practice at department of Agriculture regional field office No. 02 (DA-RFO 02 [manuscript]
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Date
2019
Authors
Monique D. Macaranas
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Abstract
The field practice mainly focused on two activities which includes (1) the design of a Small Water Impounding Project (SWIP) and (2) site inspection of an on-going Small Water Impounding Project (SWIP). The activity 1 aimed to validate the site construction for Small Water Impounding Project (SWIP), to conduct detailed engineering survey and soil investigation, to analyze the agrohydrologic analysis of the proposed SWIP to prepare a design plan of the proposed SWIP and to estimate the project cost of the proposed SWIP. The activity 2 aimed to determine the different components of on-going Small Water Impounding Project (SWIP). To fully utilized the field practice, an inspection in the site was conducted, as well as an interview among the local farmers. A topograhic survey was conducted to point elevations and coordinates using the surveying instruments RTK and Total Station. Using the SWIP Design Macro Software, the information gathered was analyzed to find the specifications for the SWIP. An AutoCAD was used to draft a detailed engineering design in order to prepare an engineering plan and an estimation of project cost. The validated site was located at Sitio Cuntapay, Brgy. Trinidad, Mallig, Isabela and found feasible for construction of new SWIP following the criteria set by BSWM, having a watershed area of 40 hectares and service area of 36 hectares with 30 benefited farmers. The drainage coefficient of the site was 0.35 which means it is a valley area. The soil type of the watershed area is clay loam and silty clay loam for the service area belonging to San Juan Soil Series. The dam height of the proposed SWIP was 8m with dam crest width of 5m and 152 m dam crest length and can impound 74,840 m³ volume of water for irrigation. The Computed Total project Cost was Php 10,379,020.85 and a development cost per hectare of Php 296,543. Since it met the Php 300,000 development cost per hectare set BSWM, the designed SWIP was feasible for construction. For activity 2, the SWIP visited was located at Brgy. Trinidad, Mallig, Isabela, having an area of 262 hectare and the existing land use is pastureland with tertiary forest along the creeks and gullies and service area of 70 hectares. SWIP components were composed pond area, watershed area, service area, Irrigation canal, outlet works and emergency spillway.