PROJDES-OZAMISCITY-1

7/31/2019 PROJDES-OZAMISCITY-1

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OZAMIS CITY WATERFRONTAND

COASTAL RENEWAL DEVELOPMENT PROJECT

Introduction

Ozamis City is nestled at the entrance of the rich Panguil Bayin Northwestern Mindanao with an estimated land area of 16,407hectares. Behind it stands the 7,956 feet Malindang Mountain.It is bounded on the north by the Mindanao Sea; on the east by

Iligan Bay and Panguil Bay which separate it from its twin city ofCagayan de Oro; on the south by the city of Tangub; and theMunicipality of Don Victorino on the west.

Like many towns and cities of Misamis Occidental, it isstraddled along the cost of Panguil Bay partly because of itsextremely rugged terrain of the interior and its commercialactivities which centers around the coastal areas.

Ozamis City is largely agricultural by resources but it has thepotentials to become a commercial center in this part of Mindanaoconsidering its strategic location and peaceful atmosphere. It is afew miles away from Maria Cristina Falls, the main source ofelectric power in Mindanao. The city has an excellent harborlocation. Its local port is the principal outlet of mineral deposits,agricultural and forest products of the rich provinces of the twoZamboanga which are Lanao del Norte and Misamis Occidental.

The city consists of 51 barangays wherein 23 are classified as

urban and 28 as rural.

Under its Resolution No. 002 series of 1998, the CityDevelopment Council, City of Ozamis, approved and adopted theOzamis City Comprehensive Land Use Plan (CLUP). In the CLUP,being the spatial translation of all the proposed developmentinitiatives of the City provided the complimentary arearequirements all enclosed within the mindset of arrestingcongestion into spearheading rapid depolarization of constricted

settlement/activities through urban expansion which included thefollowing salient areas of concern desired for realization:

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Pursuant to PRA Administrative Order No. 2007-2, City ofOzamis submitted the project description of the above project.

1. Proposed Area and Location

The Project aims to reclaim 119.38 hectares, more or less, of

Panguil Bay from Barangay Malaubang to Barangay Catadman.Midway between the two barangays is the Ozamis City Port.The project shall cover two (2) separate sites, namely, theNorth and the South Parcels. North Parcel shall be locatednorth east while the South Parcel shall be located east of theOzamis Port. The plan is to reclaim these portions of PanguilBay to generate buildable areas contiguous and adjacent to theport.

The South Parcel shall be island reclamation with anapproximate size of 119.38 hectares and which is traversed bythe By-pass Road from Barangay Malaubang to the vicinity ofthe Port. But this portion of the project shall be isolated fromthe existing shorelines of the Panguil Bay enclosed by said By-pass Road to provide waterways/channels for water circulation.

This way, displacement of informal settlers along the coastlinesshall be minimized.

The North Parcel shall be landlocked to the west of Segment 2of the By-pass Road traversing from the Port to BarangayCatadman. Roughly 8 hectares of land maybe reclaimed in thisportion of the Project.

Attached is the preliminary land form of the reclamation vis--vis the by-pass road and the Ozamis City Port.

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2. Description of the Proposed Site

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3. Reclamation Methodology

The project involves land reclamation of approximately 128hectares earmarked for various types of developments. Thereclamation of the project will be accomplished through the use

of filling / burrow materials. Approximately 12 million cubicmeters of fill/burrow materials are required to reclaim the areasup to the finished grade at an average elevation of 3.00 metersabove MLLW. This total volume does not include the allowancefor subsidence of the original ground once overlain with thehydraulically placed fill materials.

The foregoing conditions have been the basis of estimating themagnitude of cost that may be required in the reclamation

work envisaged.

Soil Stabilization

In any reclamation project, of paramount importance is thecreation of good quality land that will serve the purposes for itsenvisioned development. To achieve such objective, a goodsource of filling materials or borrow pit areas should be utilized.Unfortunately, this is not always possible due to somegeophysical factors posing some constraints to that objective.In some instances, even the available equipment andtechnology may prevent use of good dredge fills such as in toodeep borrow pit areas which are beyond the capability ofavailable equipment to reach. On the assumption that goodfilling materials are available for use, the quality of thereclaimed land may still suffer infirmities if the originalunderlying soil in the reclamation site is poor such as what isnow obtaining at the project site. It is a common knowledge inall reclamation projects that settlement or ground subsidencewill occur not only due to the consolidation of the fill but also of

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the original underlying soil itself. It is also a fact that the rateand amount of settlement are very dependent upon the type ofthe original ground stratification.

Further, depending upon the results of the detailedinvestigation of the available borrow pit areas, relatively poorsoils may sometimes have to be utilized on some portions ofthe project site due to other considerations other than thetechnical requirements thereby making some parts of thereclaimed land low grade.

Soil Stabilization Alternatives

Considering available of technology and equipment, severalmethods of soil stabilization are available to attain soilconsolidation of 90%.

Breakwaters and Bulkheads

The project involves as one of its major components theconstruction of main and secondary bulkheads of varyingdepths to retain the fill. These marine protection structures areplanned to favorably enhance the existing physicalenvironment at the project site, thus, the selection of theirstructural type becomes a major consideration. Therefore, inthe design of these structures, the following factors were takeninto account:

1. Foundation conditions which have significant influenceon their settlement and stability and therefore on the typeof structure.

2. Exposure to waves and related oceanographicconditions which control their geometry.

3. Availability of construction materials to be usedincluding costs which are significant determinants on theeconomic feasibility of the type of the structures chosen.

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Considering the above factors, two (2) general classifications ofbulkheads are required for the reclamation area as dictated bythe extent of their exposure to oceanographic conditions.

These are the main bulkheads which are directly exposed towave actions and the secondary bulkheads with less exposureto wave attacks. Foundation conditions have the same bearingon both, and therefore not considered in classifying thestructures. The factors associated with soil will, however, bevery important considerations in the selection of structure typeto adopt for both classes of the bulkheads.

Main Bulkheads

As to type of the structure, two (2) alternatives wereconsidered for the bulkheads, namely: the rockmound typeand the walled steel pipe piles.

Other structural types of bulkheads in addition to the two (2)chosen alternatives above were also considered such as thecellular and double steel sheet pile wall construction with tierods and walling to reduce flexural stresses and increasestability. These were ruled out at the initial stage of thetechnical evaluation due to:

1. The type of the structure will be very susceptible todamage due to differential settlement considering that thefirst 2 to 4 meters of the seabed consists of very poormaterials with very low shear resistance.

2. The tie rods and deadmen will require substantial openspace that may pose problems during the development ofthe area due to obstructions.

3. Probability of damage during the construction stage ishigh especially during the southwest monsoon when thestructures are not yet filled up with dredge fills.

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On the other hand, both of the alternatives considered are veryreliable under very severe sea conditions as proven byexperience on similar projects abroad, notably in Japan. Unlike

sheet piles, walled steel pipe piles can be designed as freecantilevers and therefore can be driven down to firm foundationthus eliminating settlement problems. For the rockmound type,settlement is not foreseen to be critical since the structure canundergo considerable settlement without sustaining damage.In terms of construction, walled pipe pile bulkhead is very muchsuperior to the rockmound type which normally takesconsiderable time to build. Technically, both alternatives cantherefore, be adopted to the project. However, the final choice

was made in favor of the rockmound bulkhead after evaluationof their costs. The superiority of the latter in terms of shorterconstruction time can be nullified by the fact that withappropriate procedures and technologies, reclamation can bedone even without the area already enclosed by the bulkheads.

Secondary Bulkheads

For the design of the secondary bulkheads, it was decided thatthe upper portion just above the high waterline be madesloping for aesthetic reasons. This requirement is veryadvantageous from an engineering standpoint.

The use of cantilever sheet piling now becomes attractiveconsidering less stringent requirements for embedment.However, upon evaluation of their costs, this alternative appeartoo costly and therefore, another alternative was considered the rock revetment type.

The design details of the rock revetment type of bulkhead arebased on standard dimension which will be firmed up in thedetailed engineering design stage. The minimum weight ofrocks specified was based o the dislodging forces of waveswithin a maximum height of 1.00 meter that is expected to begenerated in the area.

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As in the case of the main bulkhead, stability was also theprime consideration in the design of the secondary bulkhead. Arock revetment type turned out to be the best alternative.Similarly, in order to solve the stability of the rock revetment, it

also was apparent to remove the very soft upper soil layeraveraging about 2.0 meters and replacing it with a much betterselected fill materials preferably sandy material with highershear resistance. This solution will result with the soft soilcompletely removed and the new selected fill materials seatingon a hard soil layer, thus assuring stability of the revetment.

4. Sources of Fill Materials

The Project will require a total volume of fill materialsestimated at 10.50 million cubic meters to fill up the entireproject. Rocks of various weights and sizes shall also berequired at an estimated volume of 2 million cubic meters.

Sources of fill materials abound in the City. Possible sourcesare the river systems that are at economical distance from theproject site, namely: the Usugan, Labo, Clarin (Tinaclaan andSegatic Sections), Paka (Dolores and Pan-ay Sections), Palilan

and the Aloran Rivers. All sites are very good sources of fillmaterials including gravel and boulders.

5. Estimated Cost of Reclamation

Total Reclamation and Land Development Cost of the Project isestimated at P7.16 billion, broken down as P5,000.00 persquare meter for the land reclamation including containmentstructure and P1,000.00 per square meter for the landdevelopment works or a total of Php6,000.00 per square meter.

The required funding for the project shall be borne by the Cityor by a qualified private Developer.

6. Mode of Implementation of the Project

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Ozamis City is the proponent of this Project and which mayimplement the same using its own funds or through a qualifiedDeveloper subject to the public bidding requirement perExecutive Order No. 543. Customary practice and as

mandated by law, the project shall be undertaken with nofinancial exposure to the Government.

At its option, the City may bid-out the project to solicit theinterest of the private sector / Developer that will finance andundertake the actual reclamation and land development worksof the project.

As payment to the Developer, Government shall allocate

certain portion of the reclaimed land as payment (to theDeveloper) for undertaking the actual reclamation and landdevelopment works subject, however to constitutionalrestrictions.

7. Proposed Project Timetable

The reclamation project shall be completed within a period offour (4) years. Thereafter, land development works shall

commence. Engineering intervention shall be implemented tohasten consolidation of the filled-up area to enable theDeveloper to construct the major roads as well as other supportinfrastructures immediately after completion of actualreclamation works.

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