6m x 6m Water Tank Capacity, DPWH Specs, and Material Options

A DPWH tank detail drawing for a 6m x 6m footprint typically specifies the plan dimensions, wall height, freeboard allowance, inlet and outlet pipe positions, overflow and drain lines, and access manway location. The 6m x 6m figure describes the footprint only, so the usable capacity depends entirely on the wall height called out in the drawing. A procurement officer matching a DPWH detail to an actual tank order needs three numbers from the drawing: the footprint (6m x 6m in this case), the total wall height, and the freeboard, which is the gap left at the top so the tank does not overflow when filled to capacity. JOHOB reviews the DPWH detail against the intended modular tank module sizes before quoting, so the delivered tank matches the drawing's footprint and height rather than the nearest stock size. This matters because modular tanks are built from standard panel modules, and a footprint that does not divide evenly into those modules can mean wasted capacity or a non-standard panel cut. Buyers working from a DPWH-issued drawing should send the drawing itself, not just the 6m x 6m label, so the quote accounts for wall height, freeboard, and any structural support requirements noted on the detail. JOHOB's quote-based process includes this drawing review as a standard step before pricing is issued.

Capacity for a 6m x 6m tank scales directly with wall height, since the footprint is fixed at 36 square meters. At 1 meter of water depth, the tank holds approximately 36,000 liters. At 1.5 meters, approximately 54,000 liters. At 2 meters, approximately 72,000 liters. At 2.5 meters, approximately 90,000 liters. At 3 meters, approximately 108,000 liters. At 4 meters, approximately 144,000 liters. These figures are gross volume at the stated water depth and do not yet subtract freeboard, which a DPWH detail will typically call out separately as the unused height left at the top of the tank. A tank with a 3 meter wall height and 300mm of specified freeboard, for example, holds its full 108,000 liters only up to the 2.7 meter working depth, not the full wall height. Buyers sizing against a fire reserve requirement, a potable water storage requirement, or a cistern capacity target should confirm which of these two numbers, gross wall height or usable depth after freeboard, the specifying engineer intended before finalizing an order quantity.

JOHOB supplies 6m x 6m modular tanks in FRP, GRP, HDG (hot-dip galvanized steel), and stainless steel, all under the TankSmith sister brand for modular tank turnkey installs. FRP and GRP panels are the common choice for potable water and general storage where corrosion resistance and lighter installation weight matter. HDG panel tanks suit sites where a lower-cost steel option is acceptable and the site is not exposed to highly corrosive conditions. Stainless steel panel tanks are specified where water quality requirements or site conditions call for the highest corrosion resistance, such as food-grade or pharmaceutical-adjacent facilities. All four material options are supplied with WRAS-certified panels and built to ISO 9001 manufacturer quality standards, with TUV SUD testing on the construction. The choice between materials for a given DPWH-specified project usually comes down to the water quality requirement stated in the project specification and the budget allocated for the storage line item, both of which JOHOB's quoting team reviews against the DPWH detail before recommending a material.

Before placing an order against a DPWH tank detail, confirm these specs against the drawing and against JOHOB's standard certifications: WRAS certification on the panels (relevant for potable water contact), ISO 9001 manufacturer quality management system certification, TUV SUD testing records, CE marking where electrical accessories such as level controls are included, and ASME compliance where the installation includes pressure vessel components. For tanks supporting fire protection reserve requirements specifically, confirm the required reserve volume against the capacity table above, since fire reserve sizing is typically a separate calculation from potable or process water storage. JOHOB's quote process includes a review of which of these certifications apply to the specific DPWH detail submitted, since not every certification is relevant to every installation, for example ASME compliance only applies where pressure vessel components are part of the scope.

Standard lead time for a 6m x 6m modular tank matching a DPWH detail is 21 to 35 days for ex-stock configurations, or 45 to 90 days for made-to-order specifications such as non-standard materials or site-specific fittings. JOHOB responds to RFQs within 1 business day. Pricing is quote-based rather than published, since the final price depends on the wall height, material, and fittings called out in the specific DPWH detail submitted. Standard 12% VAT applies to VAT-registered buyers; PEZA and SBMA locators and exporters qualify for zero-VAT treatment under standard PEZA/SBMA rules. JOHOB delivers nationwide, covering NCR, Luzon, Visayas, Mindanao, and PEZA/SBMA/Clark zone sites. To get a quote, submit the DPWH detail drawing along with the project location so the quote can reflect the correct VAT treatment and delivery logistics.