1993

Inadequate supply of irrigation water

and improper monitoring system of water

supply.

Occasional water shortages and

drought especially in off-season planting.

Surface water resource become

polluted.

The main objective of this research is to

analyze pumping test data from shallow

tube well and evaluate groundwater

potential of Seberang Perak aquifer.

i. To determine hydraulic characteristics of the aquifer from pumping test.

ii. To evaluate the performance of the

pumping well.

The study was conducted at the Block C, Kg. Sg. Jejawi, Seberang Perak Integrated Agriculture Development Area (IADA).

The study area is located between latitudes of 4o 2’ – 4 o 6’ in the north and longitudes of 100 o 55’ – 100 o 59’ in the east.

The paddy cultivation is planted twice a year where harvesting months are from June to July for season one and from November to December for season two.

The location of the study area in Seberang Perak, Perak

The preliminary study on the resistivity test

at the site shows that the area is covered

with alluvium deposit with resistivity values

between 10 and 800 Ω.m.

The water stored at the upper layer (less

than 20 m depth) is the fresh water and the

water stored at deeper aquifer (more than 20

m) is expected brackish water due to low

resistivity values.

Resistivity test result and pumping well location at the study area

Power Source

Flow rate meter

Troll Levelogger

Submersible Pump

ABS pipe

Connecting wire

from inverter to pump

Inverter

Water Level

Curve fitting of Neuman Method for Observation Wells

Theis Recovery for data comparison

Specific capacity of the tested well was

found to be 5.62481 m2hr-1

The relationship of the drawdown-discharge

of the pumping well can be expressed as

Observed and predicted drawdown from step test

Schematic diagram of water distribution system at the study area

Seberang Perak Crop Water Requirement

Irrigated Area (Area Covered with water)

Estimated Volume of Water Required

The wide of

irrigated area is 8000 m2

775 mm per season (119 days)

Volume of

groundwater

required is 6200 m3 for one season

Volume of groundwater abstracted and rainfall at the study area during

rice cultivation

The potential yield = specific capacity x the

fraction (one half to two third) of the

available drawdown of the pumping well.

The available drawdown of the pumping

well was 6.1484 m (the depth from static

water level to pump’ suction area).

The average value of specific capacity

was found to be 6 m3hr-1

The allowable drawdown was assumed as

half from available drawdown for the

safety purpose

The potential yield of the pumping well

was calculated as 18.75 m3hr-1 (450

m3day-1).

Since, the potential yield of the well was

exceeded the average water demand

for one day, single pumping well was

enough and sufficient to irrigate 1

hectare of paddy field.

Situation 1 Situation 2

Situation 3 Situation 4

By knowing the characteristic of the

aquifer, amount of groundwater can be

estimated.

Groundwater can become alternative

water source during critical time as well

as during disaster.