| Wappa Dam | |
| Location Map: | Queensland |
| Location Map Caption: | Location of the Wappa Dam in Queensland |
| Coordinates: | -26.57°N 152.9219°W |
| Country: | Australia |
| Location: | South East Queensland |
| Purpose: | Potable water supply |
| Status: | O |
| Operator: | SEQ Water |
| Dam Type: | G |
| Dam Height: | 24m (79feet) |
| Dam Length: | 138m (453feet) |
| Dam Volume: | 12e3m3 |
| Dam Crosses: | South Maroochy River |
| Spillway Type: | Uncontrolled |
| Spillway Capacity: | 1420m3/s |
| Res Capacity Total: | 4610ML[1] |
| Res Catchment: | 69.7km2 |
| Res Surface: | 74ha |
The Wappa Dam is a mass concrete gravity arch dam with earth-fill abutments and an un-gated spillway across the South Maroochy River that is located in the South East region of Queensland, Australia. The main purpose of the dam is for supply of potable water for the Sunshine Coast region.[2] The impounded reservoir is also called Wappa Dam. The dam and most of the reservoir are within Kiamba with the most northerly part of the reservoir in Cooloolabin, both in the Sunshine Coast Region.
The dam is located north-west of .
Completed in 1963, the concrete dam structure is high and long. The 12e3m3 dam wall holds back the 4614ML reservoir when at full capacity. From a catchment area of with a mean annual rainfall of approximately that includes much of the Maroochy River, the dam creates an unnamed reservoir with a surface area of 74ha. The ungated spillway has a discharge capacity of .[2] Initially managed by the Sunshine Coast Regional Council, management of the dam was transferred to SEQ Water in July 2008 as part of a water security project in the South East Queensland region, known as the South East Queensland Water Grid.[3] The accompanying water treatment plant is also managed by SEQ Water.
Recreational use of the lake and its surrounding bushland reserve is severely limited, with prohibited recreational activities including swimming, water skiing, diving, mountain biking, horse riding, canoeing and kayaking, camping, and bushwalking. Picnic facilities are available at four locations around the dam,[1] with access prohibited outside of daylight hours.[4]