We will be using various programs:
ArcGIS (Geographic Information System mapping program), HEC-RAS (Hydraulic Engineering Center-River Analysis System), HEC-HMS (Hydraulic Engineering Center-Hydrologic Modeling System). HEC-RAS and HEC-HMS are both free and can be downloaded on any personal computer. We will be collecting data from various sources in order to run these models.
Below are the design alternatives we are considering for the onion farm site and also for the golf course area. These can be seen in more detail in our Project Proposal and Feasibility Study (PPFS) which can be downloaded on our "downloads" page.
This alternative will include a berm with an emergency spillway. This is a retention pond which means that there will be a constant pooling of water.
- Simple and consistent with the surroundings
- Creates constant pooling of water behind the berm
This alternative will detain water during times of high rainfall and will be released at a controlled rate into the storm sewer under 36th Avenue via a pipe connection from the detention pond to the sewer.
- Consistent with the surrounding area and meets with the expectations of the residents
- There would be less pooling of water on the upstream side of the berm after a storm event and most of the water would exit the ground through the orifice
- Less risk of overflowing channel onto the adjacent properties
- There is still a channel of water next to their houses
- If there were a pipe buried from the orifice to the existing storm sewer for 36th street an easement would need to be obtained from the residents who have been very cooperative thus far
- Will also be much more costly than any other alternative, especially if a pipe were to be buried and connected to the 36th Avenue storm sewer
This alternative would include an open channel that would take water from the detention pond to the surface of the road bypassing the houses.
- Low cost due to ease of construction
- Only minor regrading required
- Only be successful if there is little flow into the area.
This alternative would expand the existing detention pond south of I-196. This is a regional detention pond that is owned by the county
- The amount of material removed would be greatly reduced which would result in greater cost savings
- Only having one site will reduce space used for flood management
- Restricted by the surrounding area to expand
This alternative would be to design a new detention pond in a new location
- We could design the pond however works best and not have to worry about working around an existing structure
- Extraction of all the material from the site and would have to transport it away
- Increase in cost and longer project duration
- Would also have to cut down trees which would change the surrounding habitat
- It is aesthetically pleasing to the public
- Plants could be replaced and maintained, and less water will be sent downstream but infiltrate the ground instead
- With the addition of plants and trees, the ecosystem can be restored in a way
- With more water infiltrating through the ground, less water will be flushed downstream, lessening the chances of flooding
- Reduce on the amount of pollution, such as soil, fertilizers, etc., that is discharged into rivers.
- More expensive due to the specific soil requirements and plant life that can exist is a completely saturated environment.