dome. After finishing the dome, the straw would be set on fire, hence clearing the space inside. However holes can be seen in the walls of many storage spaces where scaffolding perhaps may have been used. A storage space with a rectangular plan is much harder to dome than a circular one. It is not known why architects in particular places chose rectangular or circular layouts, considering that cylindrical spaces were easier to cover, and were deemed more hygienic for water storage due to lack of any corners in the space. Cylindrical tanks also had the advantage of experiencing homogenous forces throughout the walls caused by earth pressures, as opposed to the rectangular designs. Rectangular plans however have the advantage of containing larger volumes of water within rectangular property limits. Examples of ab anbars with a square plan include the Sardar-e Bozorg ab anbar in Qazvin by Sardar Hosein Qoli Khan Qajar and his brother Hasan Khan Qajar. Some ab anbars required columns to be built inside the storage space. The Sardar e Kuchak ab anbar in Qazvin uses a massive column in the center that splits the space up into four 8.5 X 8.5 meter contiguous spaces, each separately domed. The Zananeh Bazaar ab anbar of Qazvin uses 4 columns inside its storage tank. The Seyed Esmail ab anbar in Tehran is said to have had 40 columns. Access In order to access the water, one would go through the entrance (sar-dar) which would always be open, traverse a stairway and reach the bottom where there would be faucets to access the water in the storage. Next to the faucet would be a built-in seat or platform, a drain for excess water, and ventilation shafts. The temperature of the water flow is dependent on the faucet location (i.e. depth from surface). Some storages would have multiple faucets located at intervals along the stairway. Possible contamination is minimized by lack of direct access to the entirety of the water stored. The storage compartment is completely sealed except for ventilation shafts or windcatchers. To further minimize contamination, the storage tank's interior was scattered with a salty compound that would form a surface on top of the water. The storage tank would then be monitored year round to ensure that the surface had not been disturbed. The water of course would be drawn from the bottom using the pasheer. In some ab