Difficult Site ScreeningDifficult Site ScreeningFirst Creek Case StudyFirst Creek Case Study

Prepared ByPrepared By

Dr. Donald R. Reichmuth, P.E.Dr. Donald R. Reichmuth, P.E.

Allan S. Potter, P.E.Allan S. Potter, P.E.

Geomax, P.C.Geomax, P.C.September 2006September 2006

The QuestionsThe Questions

Is it better to provide an affordable, Is it better to provide an affordable, non-standard screen & fish passage non-standard screen & fish passage method or do nothing?method or do nothing?

How can approval be more quickly How can approval be more quickly obtained if non-standard methods are obtained if non-standard methods are used?used?

Location MapLocation Map

First Creek Diversion

Diversion Site Looking Upstream- Gradient 5-6 %Diversion Site Looking Upstream- Gradient 5-6 %

Existing HeadgateExisting Headgate

Diversion Canal Dates From 1880’s- No Fish ScreenDiversion Canal Dates From 1880’s- No Fish Screen

Remnants of Concrete DamRemnants of Concrete Dam

Site Access Road- 30% GradeSite Access Road- 30% Grade

Bridge over canal

The SiteThe SiteConstraints:Constraints:

1. Not accessible with wheeled heavy equipment1. Not accessible with wheeled heavy equipment

2. No power available2. No power available

3. Steep stream gradient3. Steep stream gradient

4. Considerable bedload & debris movement4. Considerable bedload & debris movement

5. Remote & subject to vandalism5. Remote & subject to vandalism

6. Requires winter flow diversion6. Requires winter flow diversion

7. Summer flow must be proportionally split7. Summer flow must be proportionally split

8. Stream can go dry8. Stream can go dry

Modular Construction PossibleModular Construction Possible

Trash Rack DetailsTrash Rack Details

Group FeedbackGroup Feedback

What have we missed?What have we missed?