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Stormwater Basin Assessment Report

Site Overview

The image shows a stormwater detention basin that exhibits several maintenance concerns requiring prompt attention. This appears to be a dry detention basin design within a landscaped community or commercial property setting.

Key Issues Identified

1. Standing Water & Algae Formation
The basin shows significant algae accumulation in the central collection area. This indicates extended periods of standing water, which is problematic for a dry detention basin that should drain completely within 24-72 hours after a rain event. The black/green algal growth suggests nutrient-rich water is being retained rather than properly draining.

2. Drainage System Concerns
The visible inlet/outlet structure (concrete box with grate) appears to be functional but may be experiencing reduced capacity. Given the standing water despite no visible recent rainfall, this suggests potential clogging within the drainage system or insufficient slope gradient for proper drainage.

3. Vegetation Management Issues
The surrounding turf exhibits signs of stress with patchy, brown areas. This could indicate several issues:
 

• Irregular hydroperiods (alternating too wet/too dry conditions)

• Possible soil compaction

• Unsuitable vegetation selection for a stormwater facility

• Inadequate maintenance regime

Recommended Tigris Services
 

1. Stormwater Infrastructure Assessment & Rehabilitation

2. Complete inspection of drainage structures, including subsurface components

3. Hydro-jetting of any clogged pipes or conduits

4. Evaluation of design elevations and drainage patterns

5. Algae & Vegetation Management

6. Targeted treatment of existing algae using EPA-approved algaecides

7. Implementation of regular maintenance program to prevent recurrence

8. Recommendations for appropriate basin vegetation to improve filtration and aesthetics

Basin Recontouring & Optimization
 

1. Assessment of basin grading and slopes

2. Potential redesign to eliminate low spots that retain water

3. Installation of micrograding to improve flow patterns

Long-term Maintenance Program
 

1. Scheduled inspections and maintenance visits

2. Proactive treatment regimen to prevent future issues

3. Documentation for regulatory compliance purposes

Potential Underlying Issues

This basin appears to be suffering from common stormwater facility challenges including:
 

1. Potential design limitations (insufficient slope or undersized drainage components)

2. Lack of regular maintenance leading to system degradation

3. Possible upstream issues contributing excess nutrients

4. Weather pattern changes increasing intermittent moisture in the basin

Follow-up Questions for Client
 

1. How old is this stormwater facility?

2. Has the basin been regularly maintained, and if so, what is the current maintenance schedule?

3. Have there been recent changes to the drainage area feeding into this basin?

4. Are there any known regulatory compliance concerns or neighbor complaints?

5. Has the basin previously functioned properly, or is this an ongoing issue?

This facility would benefit from Tigris's comprehensive stormwater management approach, addressing both immediate concerns and implementing preventative measures to ensure long-term functionality and regulatory compliance.RetryClaude can make mistakes. Please double-check responses.