Irrigation capability assessment of MOLAWIN creek using dynamic hydrologic system model.

Date

4-2012

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Abstract

The objective of the study was determine the capacity of Molawin creek to satisfy irrigation water requirement of the Central Experiment Station in University of the Philippines Los Bañ Goldsim, a dynamic modeling software, was used to develop the Australian Water Balance Model for the Molawin watershed. Model inputs include monthly potential evapotranspiration and daily rainfall. The model was used to generate daily flow in Molawin creek for 30 years. Rainfall, potential evapotranspiration, and the simulated river flow were subjected to general frequency analysis. Rainfall and potential evaporation that correspond to 20% acceptable risk were used to estimate irrigation water requirement, while flow that correspond to 20% acceptable risk is used to determine the irrigable area assuming a run-off-the-river irrigation system. It was found that the flow from Molawin creek during the first five months of the year has a negligible contribution to irrigation demand in lowland area, because the period covers the dry season. The flow, though,can satisfy around 30% of irrigation demand in the upland area during the first three months of the year because of lower irrigation demand compared to lowland crops. But for the rest of the year, the amount of flow is enough due to rainfall contributions. Maize and rice were chosen as the representative crop for the upland and lowland portion of CES, respectively. The highest water requirement is around 103 lps, which occurs during land soaking on the first half of May. The reliability of irrigation system was also estimated by simulation of reservoir operation using Goldsim. It was found that a run-of-the -river system meets irrigation demand 49% of the time. To meet water requirements 80% of the time, a 175,000m³ reservoir is necessary.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2012 E63 /V45

Document Type

Thesis

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