Water Sources

The LWD water supply comes from groundwater through wells and spring. System 1, System 2 and System 5 are supplied by wells drilled into the recent alluvial deposits while System 3 is supplied by a well drilled in the reef limestone. Well depth ranges from 24 – 72 meters. To ensure that no surface contaminants will enter the wells, cement grout were installed on the annular space between the borehole and the casings from ground level to 15 meters below ground level. The wells are also tapping the deeper aquifer system avoid contamination from septic tanks, animal wastes, fertilizers and agricultural pesticides. Tapping the deeper aquifer also lessens interference drawdown to existing domestic and irrigation wells. The well sites were selected based from the groundwater investigations and geo-resistivity surveys carried out by LWUA and WATCON, Inc. The studies were made to determine groundwater availability and quality prior to well construction.

 All the well sites belong to the LWD. The recharge areas (watershed) of all the four (4) wells are the rolling hills and rugged highlands to the north and east of the Lobo Poblacion.

Well Depth    SWL

(meters)       meters

Discharge

(Ips)

PWL

(meters)

Pump

(Hp)

PS 1 (Well No. 1)

60

8.6

18.0

9.1

20.0

PS 2 (Well No. 2)

62

35.5

11.0

37.5

15.0

PS 4 (Well No. 3)

24

5.5

8.0

6.0

7.5

PS 5 (Well No. 4)

72

25.6

15.0

27.7

15.0

PS 6 (Well No. 5)

70

14.4

12.0

22.3

10.0

 

Well No. 5, which serves as stand-by source for System 1 is also used during periods of unusually high demands such as fiesta and during the holiday seasons.

Well No. 1 is provided with a 45 KVA stand-by generator set while Well No. 4 is provided with a 38 KVA stand-by generator set.

A protected watershed in Barangay Sawang covering 28 hectares is being managed by the LWD with the support of civic organizations, government bodies, church, schools and private companies. This watershed serves as the recharge areas of Well No. 3.

System 3, which supports the water requirements of Barangay Malapad na Parang is supplied by spring sources. The springs emanate from the Early Pleistocene Lobo Agglomerate formation, which consists of andesite fragments in a tuffaceous matrix. The springs, which are located in .a private property are provided with a spring boxes without covers and perimeter fences. Being within a private lot, the LWD has limited access and jurisdiction to areas surrounding the springs. Spring water is diverted to a collector tank before it is pump into a 27 cum ground reservoir using a 7.5 Hp submersible pump. Spring flows are very limited during the summer months and rationing is done almost every year. Drilling of well in the area is being planned but it is still in abeyance due to budgetary constraint. Groundwater investigation that will include geo-resistivity survey will be made prior to actual well construction to determine the depth and thickness potential aquifer layer/s and water quality. From the known geologic characteristics of the area, only small capacity well is expected.

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